Spun the truck to about 6400 this past weekend and the AC compressor locked up. It was only a few years old and was the stock replacement. No previous issues with the AC and it was not on when it locked up, the vent fan was on, but not AC. Anyone had this happen and any recommendations for after market compressors that can take the higher RPMs?

 

IMO you were unlucky, I don't think this is a very common problem.

 

The stock tune for a 2002 truck disables the A/C at 100% throttle or 5250 rpm if not at 100% throttle.Now that you inspired me to look this up, I think I will change my disable rpm to something reasonable, maybe 3000.

Can anyone think of a reason to keep the clutch engaged above 3000 rpm?

 

I knew it disabled at WOT but not the RPM limit, thanks for looking it up.

 

Depending on your gearing, you will exceed 3k at 60-65mph in 3rd. If you tow a heavy load and need to hold 3rd, might get toasty in the cab

 

I did a WOT pull on the freeway once with the A/C on and it fried the A/C clutch, it slung black melted **** all over the engine bay. I am not sure it is related to the pull but it sure seemed like it.

 

That makes sense, thanks. HP Tuners should have a table for A/C rpm disable for each individual gear.

 

Did there used to be friction material on my A/C clutch? It's metal to metal now.

I was thinking the black melted stuff was friction material is why I asked.

 

Been meaning to lower my A/C settings, forgot until this thread... thanks!

Disable RPM 5,200 re-flashed to 3,800
Re-Enable RPM 5,000 re-flashed to 3,500

Disable TPS 100%
Re-Enable TPS 0%

 

Mine used to disable at 4000, or heavy throttle, whichever it saw first. It worked well for me, stayed on during spirited acceleration but not heavy acceleration.


And it sounds like the pulley bearing locked up, not the actual compressor. If the compressor did then it may have been on during the pull so you need to get your tune looked at if that's the case. If the pulley bearing locked up then that was just bad luck..