iFixit - Answers With Device "GMC"

2015-Present GMC Yukon: My A/C is going from hot to cold and back A/C no longer blows

Sun, 17 May 2026 18:40:49 -0700

I drive a 2015 Yukon SLT

So I just started having an issue or my AC is blowing cold, but then starts to blow warm, but then starts to blow cold again. I noticed my cooling fans only work when my AC is on, but never engages to the high speed. It should after reaching a certain temperature. I had someone use a scanner to automatically turn on the fans to high and they do work but at the same time this happens my back, A/C doesn’t blow at all no air comes out. I change the sensor that’s on the line. No change. The guy who scanned it said he was getting a bunch of HVAC issues. But also got a code that said no communication with the Telematic control module. He said that could be the issue that’s causing the fan to not turn on high and for the back fan not to work at all but everything I’ve seen online says there’s no correlation. I don’t wanna buy the module if there’s no correlation any help would be great.

⟐ Commented 5월 17, 2026 at 18:40 GMT-7

1988-1998 GMC Pickup: What makes the 700r4 tranny just start slipping and loosing all high g

Sat, 09 May 2026 00:16:28 -0700

Only reverse and first and half of second gear work and second gear catches and releases

⟐ Answered 5월 09, 2026 at 0:16 GMT-7

1988-1998 GMC Pickup: Porque tiene hard time starting

Mon, 04 May 2026 18:31:34 -0700

Mi chevy Silverado has a hard time starting

⟐ Commented 5월 04, 2026 at 18:31 GMT-7

2015-Present GMC Yukon: Windshield washer not working

Sat, 25 Apr 2026 21:54:23 -0700

Windshield washer not working

⟐ Answered 4월 25, 2026 at 21:54 GMT-7

2014-Present GMC Sierra: Automatic running board not working how ti fix it?

Sat, 25 Apr 2026 18:59:40 -0700

Automatic running board driver side is not working properly

⟐ Answered 4월 25, 2026 at 18:59 GMT-7

1999-2007 GMC Sierra: What causes all the clusters in a dash not to work and fuse is not blo

Sun, 19 Apr 2026 15:16:42 -0700

What is my gauges and my speedometer not working the truck and you can't start it by the key you have to pop the hood and start by solenoid

⟐ Answered 4월 19, 2026 at 15:16 GMT-7

2006-2014 GMC Yukon: 2007 Yukon 1500XL Engine Light

Sat, 18 Apr 2026 14:54:19 -0700

2007 GMC Yukon Denali 1500XL AWD
6.2L V8
187k miles

Been having some engine issues.
Replaced all 8 spark plugs, wires, coils.

Now at idle, no significant shaking.
Fuel System 1 and 2 status move to OL-Fault after a minute or so
Then traction control and stability lights come on
Followed by flashing check engine - P0300 multiple misfires

Check each cylinder report - 0 misfires on all

Get the RPMs to 2000 and the Fuel status 1 and 2 both go to CL.
The engine light goes away
The traction and stability lights go away

Drives fine. No noticeable issues other than the beeping an annoying flashing lights.

Issue seems to be air intake or fuel mix or sensors.

Short term fuel trim stays at 0.0% until the RPMs are up. Open loop fault?

O2 sensors seem sluggish - move between 0.9v and 0.2v.

MAF 0.78 to 0.83 pounds/min at idle
MAF 2.5 pounds/min at 2000 RPM

All the problems are at idle. I cleaned the throttle body, added fuel, did a battery reset. What else?

I threw all this into AI and it says I need to replace the front two O2 sensors. But what do humans think?

GMC: Changing out a crankshaft sensor

Wed, 15 Apr 2026 14:51:39 -0700

How do I replace the crankshaft sensor on my 2018 GMC canyon

⟐ Commented 4월 15, 2026 at 14:51 GMT-7

2014-Present GMC Sierra: stuck in 4 wheel drive

Sat, 11 Apr 2026 18:29:28 -0700

My truck is stuck in 4 wheel drive how can I fix this?

1988-1998 GMC Pickup: Transmission will not change gears

Thu, 09 Apr 2026 14:35:18 -0700

Transmission will not change gears

⟐ Commented 4월 09, 2026 at 14:35 GMT-7

1999-2007 GMC Sierra: Cruise control not working, 2006 Duramax

Wed, 08 Apr 2026 00:14:58 -0700

Cruise control not working,,what can I check ?

On a 2006 Duramax,,

⟐ Commented 4월 08, 2026 at 0:14 GMT-7

2015-Present GMC Yukon: How to replace switch on driver side seat on a 2016 Yukon

Thu, 02 Apr 2026 08:03:49 -0700

How to replace the switch on the driver side seat

⟐ Marked as duplicate 4월 02, 2026 at 8:03 GMT-7

GMC: How to replace the power switch on a driver side seat

Thu, 02 Apr 2026 08:03:49 -0700

The seat adjustment, Control how do you replace it?

⟐ Marked as duplicate 4월 02, 2026 at 8:03 GMT-7

2014-Present GMC Sierra: 2018 Denali window controls not working

Tue, 24 Mar 2026 19:30:14 -0700

Drivers door switches wont control window functions on passenger and rear windows but operate drivers front window. Also mirror controls dont work

1999-2007 GMC Sierra: Why is hot air being forced out of defrosters when a/c is turned on?

Sun, 15 Mar 2026 20:27:25 -0700

Driver's side and rear has cold air but passenger side is hot air. and the defrosters are blowing out hot air even when the settings for windshield are off.

⟐ Commented 3월 15, 2026 at 20:27 GMT-7

2006-2014 GMC Yukon: How do I fix my driver side retractable mirror? Motor runs but doesn’

Sun, 15 Mar 2026 01:17:57 -0700

Driver side retractable mirror does not work. Motor is working but no retraction.

⟐ Commented 3월 15, 2026 at 1:17 GMT-7

2000-2006 GMC Yukon: brake pedal falls to floor

Sat, 14 Mar 2026 16:05:18 -0700

I have a 2003 Yukon denali. I have replaced front hub assemblies on both sides. both front calipers, hoses, rotors and pads. and also drivers side rear caliper. also replaced master cylinder. manually and electronically bled the brake system 10 or more times. if stitting at a traffic light after about 10 seconds the brake pedal falls to the floor slowly and the truck starts moving forward. what can cause this?

⟐ Commented 3월 14, 2026 at 16:05 GMT-7

2015-Present GMC Yukon: Driver side mirror does not retract.

Sun, 15 Mar 2026 01:15:54 -0700

Driver side mirror does not retract?

⟐ Marked as duplicate 3월 15, 2026 at 1:15 GMT-7

2000-2006 GMC Yukon: Why does my battery go dead sometimes and sometimes it dont

Fri, 13 Mar 2026 06:04:09 -0700

Some days when I go to start it the battery is dead and sometimes just 1 hour the battery is dead what is causing this

⟐ Answered 3월 13, 2026 at 6:04 GMT-7

2000-2006 GMC Yukon: Y is my rpm in keep going high n I lose pressure

Thu, 12 Mar 2026 17:57:28 -0700

Y is my rpm going high

⟐ Commented 3월 12, 2026 at 17:57 GMT-7