2nd Generation S-series (1995-2005) Tech Discuss 2nd generation S-series (1995-2005) general tech topics here.

a/c compressor clutch randomly engages

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Old Dec 26, 2014 | 09:14 PM
  #11  
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thank you. i was thinking the same thing.

a sticky relay could certainly cause that situation.

i was also thinking a frayed wire touching ground. if i remember correctly, the ground is switched on that system.
 
Old Dec 26, 2014 | 09:23 PM
  #12  
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Correct, the clutch relay is ground side switched by the PCM through a dark green with white tracer wire. If that wire grounds out, the clutch will cycle.
 
Old Jan 3, 2015 | 07:04 PM
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i swapped the relay with the horn relay and have run it like that for one week now. that one particular problem seems to have cleared up. i still have several other issues with the hvac system and will deal with them in time.

thank you captain hook for helping me understand the system. if you have a paypal account, send me a message with your info and i will buy you a six pack for your trouble.
 
Old Jan 3, 2015 | 07:15 PM
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No payment necessary, but thanks

Swapping with the horn relay should have caused the horn to blow all the time. Maybe it was just stuck and removing it jarred it loose, time will tell. Thanks for posting back!
 
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