2003 Chevy Suburban compressor not engaging

Tiny
LOFTI4
  • MEMBER
  • 2003 CHEVROLET SUBURBAN
  • V8
  • 2WD
  • AUTOMATIC
  • 100,500 MILES
I am trying to trouble shoot the compressor before having to go to a shop. I don't have power at the compressor plug using a check lite. Have checked all fuses and the relay, still can't get the trouble lite to work at the plug, any ideas
Do you
have the same problem?
Yes
No
Monday, May 31st, 2010 AT 2:16 PM

1 Reply

Tiny
FACTORYJACK
  • EXPERT
The engine control module controls the relay. If there is no power at the compressor connector, you either have a faulty relay, or the ECM is prohibiting it for some reason. If the A/C COMP, and IGN E fuses are good, do you hear the relay click when the compressor is cycled? The dark green wire at the compressor connecto is power from the relay pin 87. With your key on you should have power at both pins 30, and 86, and the ecm grounds the relay at pin 85. It is possible that you have a low pressure condition that is preventing the ECM to issue a ground for the compressor. The refrigerant pressure sensor is a direct input to the ECM, this is the case on both manual and automatic hvac systems.
Was this
answer
helpful?
Yes
No
+1
Tuesday, June 1st, 2010 AT 12:35 AM

Please login or register to post a reply.

Recommended Guides