Quote Originally Posted by zadam123 View Post
mine is comming on every 1-2 minutes with the heater on and it kinda makes the car seem like it is dying. I just had my heater core replaced is there anyway this could cause this. it didnt happen before this install
I would go to nearest mechanic and to check a/c system - if your truck almost dying when a/c kick in - there is the problem with a/c compressor or restriction in lines = too hard for compressor to pull/push freon around.
also when compressor on, IC valve should slightly raise RPM - to compensate additional load on enginefrom a/c.