My 2010 ranger has been having some issues with the A/C lately. Sometimes I start her up and the A/C works fine, other times I start it and get nothing (no fan no matter what I do with the *****). I took the blower out, and of course it was working when I tried to diagnose it; but I found no issues with the blower. It didnt struggle to start and had full power right out of the gate. I am suspecting an electrical issue with the control *****. It also seems that when not running the compressor is still cooling because the lineset under the hood is "Beer can cold".

-Is there any other part that the supply voltage may be running through before the control *****?

-What is the best way to diagnose all of the wires leading to these *****?
I Havent been able to find any electrical schematics to tell me for example -Purple 12v when max a/c

 

I replaced the resistor block after suspecting the thermal limiter. Replaced on a Sat, left work on Monday and when I fired up my truck no blower :-( could the fan be causing the resistor block to heat up too much? only seems to fail late in the afternoon and I believe there is a correlation to me parking in the sun.