Posted by John T on June 05, 2010 at 08:23:10 from (66.244.97.31):
My RV is a 1995 Chevy 1 Ton Van cab over style Class C with a 454 Throttle Body and factory AC.
1) Isnt the limit switch on the big shiny quart sized Receiver/Filter/Dryer (with the big rubber removeable plug) the Low Limit???? Im pretty sure it is. The input light green wire is hot ONLY when the AC inside dash switch is on and its ALWAYS CLOSED MADE UP i.e. the voltage on the light green input is transferred over to the dark green output ALL THE TIME.
2) According to the diagram I have, the 2 limit switches (high and low pressure cutouts) are in series and then go to feed voltage to the electric fan clutch so the compressor turns.
3) MY mechanic buddy has used his snap on gauges and BOTH the low and high pressure are correct AND IT COOLS FINE BUT ONLYYYYYYYYYY IF I HOT WIRE DIRECT TO THE CLUTCH
4) Its my "best guess" the other limit switch is bad and always OPEN because it never feeds voltage to the clutch. I have it jury rigged now taking the output (dark green) of the limit switch on the filter/dryer/receiver and jumping it direct to the clutch. That way it goes dead when the inside switch is off or the limit switch on the filter/dryer/receiver would open.
I guess iffffffffff the bad/open switch is the high pressure???????????? I run the risk of blowing a hose if she over pressurizes the way its jury rigged currently. I have not found the other (NOT on filter/dryer) limit switch so far but I havent looked real hard yet.
ISNT THE SWITCH ON THE FILTER/DRYER/RECEIVER WHERE THE PLUG IS THE LOW PRESSURE ONE??
The other (high pressure??) isnt up under the dash hard to find on the evaporator I hope!!!!!!
How risky is it to by pass jump the switch as Im now doing???
Sure, I know I need to get it fixed CORRECTLTY and will so eventually btu for now it works lol Its my best guess the other switch is the HP and its bad and open or else its a simple wiring problem, but theres just no voltage getting out of the one switch (on dryer) to the compressor clutch grrrrrrrrrrrrrrrrrrrrrrr
PS sure it "sounds" easy to just trace the wires (find other switch) but on that van its just not so easy to find things grrrrrrrrrrrr
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