GMC TRUCK A/C RANDOMLY STOPS WORKING DIAGNOSIS & FIX

In today's video we take a look at a 2005 GMC Sierra pickup truck with a 5.3l V8 engine. The customers complaint is that the Air conditioning intermittently blows hot air. Follow along as I show you a few techniques to help you troubleshoot your randomly failing a/c compressor clutch coil.
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Disclaimer:
Due to factors beyond the control of Advanced Level Auto, I cannot guarantee against improper use or unauthorized modifications of this information. Advanced Level Auto assumes no liability for property damage or injury incurred as a result of any of the information contained in this video. Use this information at your own risk. Advanced Level Auto recommends safe practices when working on vehicles and or with tools seen or implied in this video. Due to factors beyond the control of Advanced Level Auto, no information contained in this video shall create any expressed or implied warranty or guarantee of any particular result. Any injury, damage, or loss that may result from improper use of these tools, equipment, or from the information contained in this video is the sole responsibility of the user and not Advanced Level Auto.

[JT-lqyd]

13:23 just about anyone can replace an AC compressor, alternator, starter, etc. Getting the correct diagnosis in the first place is a different story, this is what I am here for.

Excellent! Thanks for the tips and tricks.

[alfredocarpaneto]

My GM was doing the same thing, pressure switch was going bad. $13 at Oreilly. I diagnosed it with my $0 hand scan tool, I wiggled it and got it to replicate the problem.

[stealthginfiniti]

Like Ivan @ PHAD always says, you have to be 110% sure before replacing parts. Good job Eric in proving the problem.

[JoeBribem]

You gotta love customers that understand the importance of getting other work done when it's there and apart at your fingertips.

[drgolfjim]

Way better video than most. You speak fluently without a lot of ers and ums. Thank you.

[joebedwell]

Great concise video that explained why my 2004 GMC Sierra A/C would stop blowing cold air. THANK YOU!

[Jpilgrim]

Sometimes they’ll do that when the clutch gap has become too large from wear. Most of those Chevy trucks you can get some more life out of the compressor if you take off the front plate on the clutch and remove the spacer behind it. You can do it without removing the compressor too.

[victorramosjr]

Finally, a video that pertains to my issue... somewhat. My AC sometimes works. And sometimes it blows "cool" but not cold. Now I'm starting to think its the compressor clutch, especially with 282, 000 miles.

[tallboy]

Very insightful on the Intermittent problem. Have a 06 Chevy Silverado that has just begun with this intermittent on/ off crapola 😡🤬 guess it’s time to visit my own mechanic extrodinaire 🤬

[transientemotion]

I had this issue in a 2005 chevy silverado. One of the radiator fan relays had a poor connection. So driving the ac would turn off from regular bumps or stop and go. When the ac is on both fans should be on or on another car something easy to check. Press down on the relays see if one or both fans come on with ac on

[WaybackTECH]

331k miles on the odo is what impressed me.

[JL-qilg]

1. First thing check your freon. Low on Freon will disengaged clutch as well.
2. Rpm 2000 and check for pressure on your gauges drop.

[chapin]

The amount of knowledge I gain from this channel !!!Thanks for videos. They’ve taught me alot. 👌👌

[biofall]

You can recover the refrigerant with a recovery tank dipped into an ice bath works really well

[jimmyaber]

Intermittent failing clutch is diagnosed with amp probe in addition to things that were verified on this vehicle. The clutch gap was wide on the compressor as it was visible when he showed the old compressor. Wide clutch gap would still give amp draw of 2.5-4.5 A where failed mag winding would drop amperage to 0. If you don’t have amp probe you let it quit cooling and the safely tap clutch plate to see if bumping it allows engagement. With wide gap the reduced strength of hotter winding is too weak to pull clutch plate into pulley plate and the bump will do it. Windings can have a short (very rare) and do the initial function and then quit but usually these blow a fuse as the current draw goes up. With 300 K miles a new compressor was a good idea anyway.

[jnew]

You are the Man! That's exactly what's happening to my 2014 Chevy Express van. But my fan turns completely off for about 10 to 15 seconds. Then blast back on 🤔

[evelioa]

The corridors part was so funny lmfaoo keep up the good work !

[djosbun]

Great video, Eric! In my experience, buying a complete compressor (with AC clutch coil) is almost the same price as buying just the coil itself. Doesn't really make much sense nowadays to not replace the compressor itself.

[tylerwightman]

Damn. 300, 000+ miles on Chevy compressor! They just don't build them like they used to! You absolutely wont find a newer Chevy that will last that long. Ive replaced several that took a turn south before even making it to 100, 000. Nice diag. That's exactly how I would have done it. Love the channel!

[autoacoustics]

Sometimes its the thermal fuse link inside the clutch coil that gives you this problem, good to see you up getting back on it again