: 2005 escalade rough with heat on

11-29-10, 11:01 AM
Does anyone else have the problem when the a/c or heat is on at a red light it's very rough? I can't figure the problem out. Also the truck makes a little bit of a squeaky noise when first started. Tried lubin belt up with wd40, it goes away but comes back next time I start the truck.

Thank you

11-29-10, 11:29 AM
I don't have either of those problems...

11-29-10, 04:07 PM
my 05 doesnt have any problems wit the AC/heater like yours, but the squeaking definitely sounds like cracks in ur belt. lubing the belt doesnt always work, and even the smallest crack can cause squealing especially in colder weather. i would just replace the belt, it could possibly solve both your problems since both are related to the belt.....

11-29-10, 06:29 PM
Take the serpentine belt off and see if the A/C compressor bearings are shot....

The compressor works during A/C use, and is cycled during defrost when the heat is on...

11-30-10, 12:33 PM
Thanks for the feedback. I changed the idler pulley it went away but came back. I'm gonna change the belt see if that works since it's only squealing when it's cold also the truck has 75,000.