[acauth1]

Bobby, I still think you are low on charge. Feel the evaporator inlet (the small line) and the evaporator outlet (goes to accumulator), they should feel about the same temp. If the outlet is warmer, you're undercharged. As far as the thermostatic switch is concerned, the ones with the small adjustment screws are for very fine tuning only, you will not get more than a turn or so on each at best. Thermostatic switches don't care what type of refrigerant you use, temperature is temperature and ice still forms on the evaporator around 32*. Like I said before, you need the type of switch used on the old knee-knocker underdash units if you want adjustment:

http://www.oreillyauto.com/site/c/detail/MRY0/35845.oap?ck=Search_35845_-1_1323&keyword=35845

 

[acauth1]

The switch is intended to "make" or "break" the power circuit to the clutch depending on evaporator temperature as you well know. It's possible that the two green wires to the switch are intermittently shorting together thus bypassing the switch altogether. If multiple switches have not solved the issue then it's time to look elsewhere for the problem.

 

[acauth1]

Bobby,

ecparts.net

Nine port switch EN 1301
Two port switch EN 1302

 

[acauth1]

Have you solved the coolant flow through heater core issue yet?