i had a 87 sdl sold it was sorry i did---2 yeard later i now got an 86 sdl
pulled the mono valve---that looks good-
put 12v to the fan motor --that blew fine
checked all the fueses--none of them look blown
the compresser doesnt engauge

here is my question
going into the compresser is a wire houseing witha white wire--red &purple --blue & red ---blue&green
witch one is the power supply that turns on the copresser engagueing the clutch

then i would like to know if any one besides me said screw it--
and put a ball valve where the mono valve is --for heat
and a switch to power the ac/compresser
the ambient tempature device will be ---the loose nut behind the wheel

 

Using a volt meter turn the power on to the compressor, then check to see which one is hot

 

how do you go about turning the power on to the compresser---- the dial is burried on the blue---nothing happens----

 

looks like there are two wires on the back
and four wires on the top

 

Trace the wires back from the a/c clutch there should be a low pressure cut-out switch in the line. Check for power on the opposite side of that switch, if it's there check the refrigerant charge, if not keep tracing. There is somewhere that the signal isn't getting through. When you find its source correct it. For instance the blower fan not coming on will prevent the clutch from pulling in. The climate control is only part of the equation. You need to do some digging to find the problem.

 

ill be digging