Gmc yukon fan won't turn off - Cooling fans running on high speed. I have a 2014 Chevy Silverado 1500 5.3l that I am having a issue with the cooling fans running on high occasionally. When this happens my temp gauge will read zero and when I kill the engine the fans stay on. The only way to shut them off is to crank the engine and shut it right back off.

 
18 posts · Joined 2022. #1 · Apr 7, 2022. Hello all. I recently bought a 2017 and after driving it about 1500 miles (74500k on vehicle), Something strange started happening. When I got to work yesterday, I noticed the fan running after I shut the engine off. I opened the hood, checked the coolant it was good. Felt the hoses they were luke .... Ck3 persian culture

May 8, 2020 · Learn how to fix a cooling fan that keeps running even when the key is off. Watch this video for a simple solution for Chevy vehicles. May 8, 2020 · Learn how to fix a cooling fan that keeps running even when the key is off. Watch this video for a simple solution for Chevy vehicles. Silverado Radiator Fans Won't Turn Off? FREE FIX! YouTube. Gmc Yukon Fan Won't Turn Off. If you have a gmc yukon and the fan won’t turn off, it can. March 10, 2023 at 8:35 am #750993. Web i shut the engine off the fans are running i pulled the far right (fan relay 1) the fans stopped running.As the cycling switch open and closes the pcm sees that and turns relay on and off accordingly. It is the relay control grounding circuit on your pcm that appears to have shorted it transistor cuasing a constant ground allowing the fused 12v feed to the relay to allow it to be on all the time.Does your 2014-2018 Chevy Silverado, GMC Sierra, Suburban, or Tahoe radiator fan keep running? Here are the symptoms: Fans keep running, air conditioner stop...As the coolant cools, the spring will close to stop the flow. The spring can break down over time and not work as well. 4. Radiator Cooling Fans. If you have a P0128 code or the radiator fans won’t turn off, there could be a wiring issue with the fan. The fan relay could also be stuck on.2005 gmc yukon blower motor keeps running after ignition is turned off - GMC 2003 Envoy question. Search Fixya Browse ... I have a 2005 GMC Yukon XL Denali and the air conditioner stays on even when I turn the car off, it won't turn off. ... My 2005 yukon has no ac blower fan control. check the resister next to the blower motor they ...rlrock Discussion starter. 25 posts · Joined 2019. #1 · Jul 22, 2020. When I turn the engine off on my 19 GMC Canyon V6, the fan for the AC keeps running and winds downs after about 15-20 seconds. The time it takes to stop depends on how high the fan blower setting is. I’ve never had that happen in any car or truck I have owned.Your thermostat could be stuck open or and probably more likely your coolant temp sensor has failed. When it fails the ecu goes into a protect mode and acts as if the engine is overheating. Blue Bowtie. 05-02-2021, 10:07 AM. ... your coolant temp sensor has failed. That's the first place I would look.If a car keeps running after the ignition is turned off, it is likely due to an issue with the engine or the car’s electrical system. Some common causes include: A malfunctioning idle air control valve (IAC) can cause the engine to stay running after the ignition is turned off. A problem with the throttle body or the throttle position sensor ...Some customers may comment that the blower motor is inoperative or continues to run after the vehicle has been shut off. Cause. These conditions may be caused by a blower motor control module failure. This failure may occur when the vehicle is operated in ambient temperature conditions of-23°C (-10°F) or below. Correction.Sep 25, 2022 · Cooling fans staying on after shutting engine off. I have a 2018 Silverado 1500 5.3L. The cooling fans just recently started staying on after I shut off the engine. The temperature gauge stays around 165 degrees, even while driving. The A/C also started blowing warm air. I don't see any coolant leaks and I replaced the coolant temperature sensor. The first electric Hummers will be making their way to their new owners this holiday season. According to Autoblog, GMC boss Duncan Aldred has announced that deliveries of the Humm...Jan 16, 2011 · Blower Motor Won't shut off. 2005 GMC Z71 1500, W/ Dual digital climate controls. While driving today blower motor Kicked out, I turned up the fan speed and it kicked back in. Got to my destination, turned off the key and the blower kept running. Took my climate controls out and the fan continued to work, ended up pulling the 40amp fuse in the ... A pay-per-mile insurance policy lets you pay for your car insurance by the mile. You won't pay a per-mile fee that day if you never turn the key in the ignition, and this can give ...5200 posts · Joined 2010. #5 · Apr 29, 2018. Check the pin switch in the driver's door. If your truck has Retained Accessory Power the radio should stay on till you open the driver's door. It's the same switch that turns on the dome light so if your dome light doesn't turn on with the door open the switch is bad. Ted.Some customers may comment that the blower motor is inoperative or continues to run after the vehicle has been shut off. Cause. These conditions may be caused by a blower motor control module failure. This failure may occur when the vehicle is operated in ambient temperature conditions of-23°C (-10°F) or below. Correction.In this video Sean goes over why the radiator fan won't turn off on your 2014 - 2019 Chevy Silverado or GMC Sierra. ... 2019 Chevy Silverado or GMC Sierra.#1 · Sep 25, 2022. I have a 2018 Silverado 1500 5.3L. The cooling fans just recently started staying on after I shut off the engine. The temperature gauge stays around 165 degrees, …The Yaris and Yukon are some cars manufactured as of 2014 that start with Y. The Yaris is made by Toyota, and the Yukon is made by GMC. GMC also makes an extended version of the Yu...2012 Colorado Extended-Cab 41k miles. I have been having issues for about 3 months now. The issue is sporadic and happens randomly. It does it with both heat or A/C on. The blower fan will kick off then on. Sometimes it will work constantly with no issue. Sometimes it will kick off for a few seconds or a few minutes, then turn back on like …16 Jan 2019 ... ... Yukon Silverado. The code and the warning ... GMC Sierra: Engine hot, A/C Shut Off. Long ... Silverado Radiator Fan Won't Turn Off! This ...I’ve never been a huge fan of peels, crusts, or any hardened, outer portions of various foods. Though I rarely take the time to do it, I prefer my apples peeled, and I still remove...Fans of American's official spirit, Bourbon Whiskey, shouldn't have to pay a high price for good bourbon. Celebrate National Bourbon Day, June 14, with one of these great bourbons...Dec 16, 2017 · A/C - Blower Motor Inoperative or Won't Shut OFF Bulletin No.: 06-01-39-002C Date: January 18, 2008 TECHNICAL Subject: Blower motor Inoperative or May Not Shut Off in Extremely Low Ambient Temperature Conditions (Replace Blower Motor Control Module) Models: 2004-2007 Buick Rainier 2003-2006 Cadillac Escalade Models 🔧 Experiencing the frustrating issue of your radiator fan refusing to turn off in your 2014-2019 Chevy ... of your radiator fan refusing to turn off in your 2014-2019 Chevy Silverado or GMC ...My 2015 Yukon Denali XL's engine fan runs 10-15 minutes after I shut it off. Even at cold starts, the engine fan engages. The temp gauge read more. High School Diploma. 6,359 satisfied customers. 2015 GMC Yukon Denali XL 6.2 I was hoping someone could provide factory information for cooling fan operating conditions.2005 gmc denali heater blower wont turn off - GMC 2005 Sierra Denali ... ac on a 2005 gmc yukon not blowing and cant here compressor the rear ac of the ... 0 helpful. 2 answers. Heater fan stays on after i shut off ignition and remove the key on my 2005 gmc denali. the only way to get it to stop, is to turn it off before i turn off ...Options. This can be caused by a few things. To diagnose it you need to work backwards: 1. Bad battery or low charge, or bad connections at the battery terminals. If the terminals are full of white snowy looking stuff disconnect them and clean them up. If a terminal is loose (you can turn it with your hand) tighten it. Check the battery voltage.The wiring diagram for my '07 shows a DRL relay in the underhood fuse block. The relay is ground side switched by the computer. Assuming yours is similar, I would pull that relay and see if it has trouble opening, or check for a short to ground between the relay and the computer. '98 K1500 Suburban LS 5.7 L 4L60E NV246 ARB.The ECM is not reading any valid temperature. The fan keep running after switching off is a safety measure when the ECM cannot read the temperature it will keep the fan blowing for 10 to 15 mins after you switch off to make sure the car is not in a situation where it can cause a fire (as the ECM cannot determine if the engine is ice cold or ...Well i just bought a new truck but the fan doesnt seem to be turning off once it has been warmed up. It never hits 100c, however stays very close to that mark. Even if i let it sit for about 30-40 mins and get back in, it'll be at the quarter mark but the fans will still be roaring. I've changed the fan clutch already, it still does it.Cooling Fan Relay Replacement. Estimate. $145.35. Shop/Dealer Price. $167.94 - $213.20. 2005 GMC Yukon V8-4.8L. Service type. Cooling Fan Relay Replacement. Estimate.I have a 2006 gmc denali truck and the ac blower will not shut off and I can't control the fan speed up or down from the controls. I tried the find a relay for the fan but I can't find one had to end up disconnecting the battery so It would'nt run the batt down is this somthing I can fix or am I going to have to take it to the dealer.16 posts · Joined 2010. #1 · Jul 3, 2010. When I start my truck I can't turn it off with the key in the ignition. I can only shut it down by pulling the ignition/ecu fuse. I replaced the ignition switch with a new one and I am still having the same problem. I put the new switch in, adjusted it forward and backward to find the start and stop ...Disconnect the electrical connector from the blower motor. Remove the blower motor insulating cover screws. Remove the blower motor insulating cover. Pull the retaining tab down and rotate blower motor counterclockwise to remove. Position the blower motor and turn assembly clockwise until tab locks in place.1 Answer. If the cooling fan stays running, it's possible that your cooling fan relay is stuck in the on position and is supplying constant power which is why it stays running. Swap the relay with a similar one in the fuse box to see if it goes off. If it does, replace the relay. If it doesn't, you may have a wiring issue or possibly a computer ...Radiator fan staying on all the time. I have a 2016 Colorado 3.6 with 231,200 miles on it. A week ago my radiator fan started coming on as soon as I started the truck and would stay on while driving. Temperature never got over 160. When I shut the engine off the fan would stay on for about 5 minutes and then shut off.May 8, 2014 · 70 Nova SS. 02 Suburban. Like. oilfield12. 613 posts · Joined 2012. #3 · May 8, 2014. AJ's Sierra said: So I start my '14 sierra this morning and it sounds louder than usual. The fan seems like it's loud and doesn't shut off.. Last night I had to take take out and unclip my air filter in order to get to my headlight assembly.. 1 answer. 2003 gmc sierra heat will not blow hot air. Changed thermostat, resistor, both heater core hoses are hot to touch and the coolant is full. if the blower motor motor is working then its a blocked heater core or a faulty shut off valve ,i would need to get my head under the bonnet and then the dash to find the fault to be honest.3. Bad ECU Unit. Your Chevy’s engine control unit signals the fan when to turn off or keep running. A defective ECU will result in the fan not knowing when to stop running. 4. Low Coolant Level. The car coolant is the liquid that removes heat from the radiator. The lower the coolant level, the less effective it’ll be.14 May 2017 ... Comments231 ; How to tell if you have bad engine coolant temperature sensor. Tech and Cars · 57K views ; Silverado Radiator Fan Won't Turn Off!May 13, 2023 · Does your 2014-2018 Chevy Silverado, GMC Sierra, Suburban, or Tahoe radiator fan keep running? Here are the symptoms: Fans keep running, air conditioner stop... There are a few possible causes of a furnace fan not turning off. Here are some of them: Faulty thermostat: If the thermostat is set to ON instead of AUTO, the fan will continue to run. Faulty fan limit switch: The fan limit switch is a safety device that prevents the fan from running too long. If the fan limit switch is faulty, it may not turn ...After inspecting the belt, there can only be two things left that could be happening: 1. The clutch is not getting a signal to turn on. This indicates some form of wiring problem. -or-. 2. The AC compressor is getting a command to turn on but is no longer able to, which would indicate that it needs replacing. 2.#1. T. todd0276. TYF Newbie. Joined. Sep 25, 2011. Posts. 4. Reaction score. 0. I have an '05 Yukon XL SLT, yesterday I went to the store and noticed that … THE 2015 GMC Yukon cooling fan won’t turn off, which means the system has some problems. For example, the cooling fan is not turned off because of a bad wire connection, stuck relays, or lack of power supply; the fan comes with a clogging issue or faulty thermostats. However, these are main causes that don’t help the cooling fan turn off. Cooling Fan Relay Replacement. Estimate. $145.35. Shop/Dealer Price. $167.94 - $213.20. 2005 GMC Yukon V8-4.8L. Service type. Cooling Fan Relay Replacement. Estimate.1) Opened the fuse box under the hood. 2) Pull out the 10A HVAC fuse, 3) Turn key to accessory, 4) Let it sit there for a minute out two (I let it sit for 3.5 minutes), 5) Turn key off, 6) Plug in 10A fuse, 7) Start engine, 8) Press auto a/c control switch, 9) Let a/c run for 4 mins, (during which it was cooling fine)The average weight of a Chevy Tahoe is around 5,500 pounds as of 2014. Chevrolet has produced the Tahoe since 1995 when the Tahoe model name replaced the full-size Chevy Blazer spo...Have a 95 gmc yukon 2 door, this just started today, my interior lights wont turn off, the lights that go on when you open and close the door, two in the headliner, two in the footwells, and two on the doors. The lights seem to dim a little bit when the "dome lamp off" switch is pressed but...I have discovered the fix. First disconnect your battery cable and replace it. This will restore your ecm. Then remove the cap on your on your coolant. This will …(explained) Why does my furnace fan won’t turn off: blower keep running2004 gmc yukon xl denali blower fan always on fix. Yukon blower resistorI am trying to remove my cooling fan and fan shroud from a gmc 06 envoy Ac not blowing thru front vents but blows hard in back. no will thatGmc fuse yukon denali relay 2007 blower motor ac fuses hvac.2004 GMC YUKON: BLOWER FOR THE HEATER..WONT..BLOWING. I HAVE 2004 GMC YUKON XL AND THE BLOWER FOR THE HEATER IN THE FRONT WON'T STOP BLOWING FULL THRODAL. ... I have a 2004 yukon denali xl. The heater fan wont shut off even when you shut the vehicle off and take the keys out.Wife's car is a 2017 GMC Yukon. She gets back from the store and turns the car off completely but both engine fans keep running. It did this for about five minutes, even though the temp gauge is bottomed out at 160. The only way I could get them to stop was to pull each 40 fuse. I pulled a different 40 fuse for something else, plugged them in ...Oct 28, 2022 · Radiator Fan on full blast won’t turn off even with car off, not running. How to fix it GMC Chevy. Coolant temp sensor replacement Thermostat & Coolant temperature sensor replacement: Yukon... May 14, 2011 · Photos. Subject:HVAC Blower Motor May Run Continuously After Vehicle is Turned Off (Replace Blower Resistor Relay)Models:2004 Chevrolet Avalanche, Silverado, Suburban, Tahoe, TrailBlazer, TrailBlazer EXT2004 GMC Envoy, Envoy XL, Sierra, Yukon, Yukon XLwith Manual Control HVAC (RPO CJ3)Built Prior to August, 2003. There should be a dome lamp override button just below the head light switch. Push that in and turn the ignition to on position and light should go off.Now the car is in this limbo where all of the electronics are on, but the engine is off. It won't... Forums. New posts Search forums. What's new. New ... but the engine is off. It won't let me turn the car on or off by pushing the start button. What ... DIC won't give option to learn - 2013 Yukon Denali. LurkingLuke; Dec 21, 2023 ...GM said Wednesday that it will postpone its upcoming reveal of a GMC-branded electric Hummer due to the COVID-19 pandemic. The Hummer EV debut, which was scheduled to occur May 20,...Mullen Automotive wants to acquire Electric Last Mile Solutions. Here's why this deal won't save MULN stock, if it even happens. This acquisition isn't the last mile solution that ...Mar 28, 2011 · So last night I was using my wipers on intermittent and suddenly they just started going and wouldn't turn off til I shut my truck off. Cruise still works , fluid still works , and signal is still working afaik. From what I have been able to find it looks like the motor control board .Any more... The first electric Hummers will be making their way to their new owners this holiday season. According to Autoblog, GMC boss Duncan Aldred has announced that deliveries of the Humm...1991 - 1999 Tahoe & Yukon Models. Audio & Electronics . Wipers won't turn off. Thread starter ricky68; Start ... . Wipers won't turn off. Thread starter ricky68; Start date Sep 17, 2017; Disclaimer: Links on this page pointing to Amazon, eBay and other sites may include affiliate code. If you click them and make a ...Yes, am connected to my home Wi-Fi. I have to drop a friend off at the airport tonight, that’s if my battery isn’t dead by then. I manually turned the radio and lights off but no idea what else may be running/draining the battery, and will try it connected to my phone hotspot on that drive since it will be about an hour with the car in the whole time.It’s usually normal for a fan still running when car is off for several minutes. This phenomenon cools down the generating engine’s heat, extending the engine’s lifespan. However, in case of the fan running when car is off for a long time, there are problems with the cooling system. Check related components, such as coolant level ...Nov 30, 2011 · As the cycling switch open and closes the pcm sees that and turns relay on and off accordingly. It is the relay control grounding circuit on your pcm that appears to have shorted it transistor cuasing a constant ground allowing the fused 12v feed to the relay to allow it to be on all the time. When a computer is broken or won't turn on, the files on the hard disk are not lost. By removing the hard disk from the broken computer and connecting it to a working computer, you...8 Answers. Its your blower control module ( resistor ) a fancier way of calling it a resistor. Its located where the resistor would be, by the blower motor. it has three wires connecting to it. You cant tell if its burnt out by looking at it.Need some help. My battery died two days ago, and I replaced the battery, ever since my A/C won't engage or turn on. A/C was working before dead battery I have a 00 GMC Yukon XL SLT with automatic climate control with rear climate control. I have removed all the HVAC &AC fuses and relay's to see if it resets itself. Welcome back to the channel! In this video Sean goes over why the radiator fan won't turn off on your 2014 - 2019 Chevy Silverado or GMC Sierra. Thermostat... Does your 2014-2018 Chevy Silverado, GMC Sierra, Suburban, or Tahoe radiator fan keep running? Here are the symptoms: Fans keep running, air conditioner stop...Sadly the problem started again with the exact same symptoms. This time I let the fans run after turning it off, and they ran for about 5 minutes, then shut off. Now without a battery disconnect like last time, with a totally cold engine, if I start it up, the fans are going into high speed mode, despite the engine being totally cold.OK. So, I have 3 relays in the relay housing for the fans. 2 are grey 4 prongs and the other is a black 5 prong. I pulled the grey one in the center and the fans cut off (Cooling Fan 1 relay). I then pulled the other grey one (Cooling Fan 2) and put it in to where the other was just pulled and the fans started up again.OK. So, I have 3 relays in the relay housing for the fans. 2 are grey 4 prongs and the other is a black 5 prong. I pulled the grey one in the center and the fans cut off (Cooling Fan 1 relay). I then pulled the other grey one (Cooling Fan 2) and put it in to where the other was just pulled and the fans started up again.Mullen Automotive wants to acquire Electric Last Mile Solutions. Here's why this deal won't save MULN stock, if it even happens. This acquisition isn't the last mile solution that ...I have a 2005 GMC Yukon XL. The radiator cooling fans sometimes won't turn off after the motor is turned off. It would then totally drain the battery. I have to pull the relays out to get it to turn off. Also, the motor would run rich on occaison and buck and blow white smoke out of the exhaust. I have replaced the coolant temparture sensor.My 2015 Yukon Denali XL's engine fan runs 10-15 minutes after I shut it off. Even at cold starts, the engine fan engages. The temp gauge read more. High School Diploma. 6,359 satisfied customers. 2015 GMC Yukon Denali XL 6.2 I was hoping someone could provide factory information for cooling fan operating conditions.1) Opened the fuse box under the hood. 2) Pull out the 10A HVAC fuse, 3) Turn key to accessory, 4) Let it sit there for a minute out two (I let it sit for 3.5 minutes), 5) Turn key off, 6) Plug in 10A fuse, 7) Start engine, 8) Press auto a/c control switch, 9) Let a/c run for 4 mins, (during which it was cooling fine)If that is your problem, you have an AC clutch that is sticking; or, the AC relay is staying operated. If this problem stays on all the time, or the next time it happens, remove the AC relay. If the AC stops being cold, replace the AC relay. If the AC cold continues, you have an AC clutch that won't release.Regarding 2004 GMC Yukon A/C-heater blower: when control to fan (auto or manual), is on, regardless of level (speed), there appears to be an electrical pulse that engages the fan for just a moment, tu …

19 Aug 2022 ... 2016 GMC Sierra 1500, cooling fan won't turn off, temperature sensor thermostat replacement. kaveh abedi•219 views · 10:52 · Go to channel ...... The iron claw showtimes near the grand 16 slidell

gmc yukon fan won't turn off

Denaliano. Disconnect the connector from pressure switch. Have someone watching the A/C compressor while you start the truck and turn the A/C on. If the compressor cycles on, turn it off. You now just narrowed it down to either low refrigerant or a bad pressure switch. Keep it Professional Grade. Use Genuine GM Parts.Now, 3 months later, the main heater/a/c fan is doing the same thing, stuck on high, and wont turn off, even with the key turned off. This yukon has the auto climate control Posted by 2gms on Feb 26, 2009Regarding 2004 GMC Yukon A/C-heater blower: when control to fan (auto or manual), is on, regardless of level (speed), there appears to be an electrical pulse that engages the fan for just a moment, tu …1665 posts · Joined 2012. #18 · May 26, 2014. I had a Mercedes diesel at work that the fuse box was corroded inside and keeping the ignition relay powered. You shut the key off and all the gauges went dead and everything powered down, but the engine kept running. See if you can take the fuse box apart and see if there is any green corrosion ...Wife's car is a 2017 GMC Yukon. She gets back from the store and turns the car off completely but both engine fans keep running. It did this for about five minutes, even though the temp gauge is bottomed out at 160. The only way I could get them to stop was to pull each 40 fuse. I pulled a different 40 fuse for something else, plugged them in ...The parking lights will not turn off on my 2007 Yukon Denali even with the engine off. This issue started about 2 weeks ago and the only temporary solution I have found is by pulling the fuses (#25 & 26) for the driver & passenger side park lamps in order to save my battery.2002 GMC Yukon SLE 4x4 5.3L, Automatic climate control with rear passneger controls. The blower is on high no matter where the selector is set. and stays on even if the vehicle is off and the key is removed from the ignition. Replaced the Blower Motor Control Module with AcDelco 1580189. And replaced the main HVAC control …My ac fan wont shut off in my 03 yukon?? Posted by carter75 on Sep 06, 2010. Want Answer 0. Clicking this will ... Front ac blower wont shut off after the truck is shut off. 2003 GMC Yukon XL 1500 SLT; Open Questions: 0 answers. Radio code for 2005 gmc yuckon. Read full answer.Press and hold the home and fast-forward buttons for at least 10 seconds. Press the Onstar call button, and immediately hang up. Turn the vehicle off, and then turn it back on. While in “Park ...We finished the ride home pulled in the driveway and I checked again, still cold! Also the fans were running full tilt engine off. I restarted it a couple of time no change. fans on and temp gauge didnt budge. As I was looking for the fan relay to pull it the fans shut off after about 10 minutes with the engine off. Also no CEL light.Jun 25, 2012 · SOURCE: The Heater fan in my 2003 GMC Yukon XL will not turn off. I don't know if you already fixed it, but I had the same problem on my 03 yukon, TysonRicky is right. In my case it was the blower control module. You can find it right under the glovebox. It cost me close to $100 for a new one, but very easy to replace. #1 · Sep 25, 2022. I have a 2018 Silverado 1500 5.3L. The cooling fans just recently started staying on after I shut off the engine. The temperature gauge stays around 165 degrees, …A pay-per-mile insurance policy lets you pay for your car insurance by the mile. You won't pay a per-mile fee that day if you never turn the key in the ignition, and this can give ...Feb 1, 2010 · There should be a dome lamp override button just below the head light switch. Push that in and turn the ignition to on position and light should go off. I have a 2005 GMC Yukon XL. The radiator cooling fans sometimes won't turn off after the motor is turned off. It would then totally drain the battery. I have to pull the relays out to get it to turn off. Also, the motor would run rich on occaison and buck and blow white smoke out of the exhaust. I have replaced the coolant temparture sensor.38 posts · Joined 2009. #1 · Aug 19, 2009. I have almost tried everything to fix this problem,my interior curtousy lights stay on and will not turn off. I looked up the trouble shooting steps from GM and followed them. I have even gone as far as to replace the headlight dimmer switch,door jam switches, keyless entry control module and ...1665 posts · Joined 2012. #18 · May 26, 2014. I had a Mercedes diesel at work that the fuse box was corroded inside and keeping the ignition relay powered. You shut the key off and all the gauges went dead and everything powered down, but the engine kept running. See if you can take the fuse box apart and see if there is any green corrosion ...I have a 2005 2500HD w/Duramax. My problem is the heater fan stays on and won't shut off. I have no adjustment for fan speed and it stays on even after I shut the truck off. I have to remove the 20amp … read moreI have a 2015 Yukon XL Denali. The temp gauge drops to 160 and the fan comes on intermittently. We have changed the thermostat, wire harness, ….

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