This 1985 Cadillac Fleetwood Brougham came in with the complaint that the air conditioning compressor would not turn on and the weather is starting to heat up. I checked the refrigerant level and found it low but not low enough to cause the compressor to not engage. I have been down this road many times so with the engine running and the a/c set to maximum cooling, I confirmed that the compressor would not come on. I then took a screwdriver handle and tapped on the thermostatic switch and the compressor came on. I repeated this several times just to confirm problem and then I ordered a new switch. Simple right. Well for some reason this switch is no longer listed in the application catalogs and I had to find it in a buyers guide. The part number is 15-5222 in the ACDelco brand. While I waited on the new switch I went ahead and repaired a leaking service valve at the low side service port. After that was done, I removed the seal around the hose clamps that hold the capillary tube snug against the evaporator inlet tube
I also had to remove two screws that held the old switch in place. I installed the new switch by first copying the general bend in the capillary tube from the old switch and then mounted the switch with the two screws mentioned earlier. I then slid the capillary tube into position under the hose clamp bands. I rotated the hose clamps to the original position and tightened the clamps. Snug but not too tight.
Installed new sealing compound. The industry calls it DumDum for some reason. I actually use a windshield sealing putty because no one ever seems to have air conditioning DumDum
