searched the forums and did not find a related post. hoping this is the right section too. 1987 K5 blazer. my Ac compressor starts up when I crank the truck . no matter if it is off, maz ac,ac , Bi level or vent. it only turns off when I turn it to heat. the heat works great. I see on the LMC catalog there is a ac switch and also a the temp control assembly. wondering which it may be or at least a start for me before I start buying parts and putting them on.

thanks