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'03 park ave

Tiny
MICHMECH45
  • MEMBER
  • 2003 BUICK PARK AVENUE
  • 150 MILES
'03 park ave. Compressor doesn't come on after dealer engine change. Relay is good, fuse good, 12v present at both. A/c clutch supplied 12v and ground - clutch works. System is still charged. 12v present at both terminals of compressor plug (no ground)
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Monday, May 7th, 2012 AT 2:19 AM

13 Replies

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Need more info

Roy
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Monday, May 7th, 2012 AT 2:28 AM
Tiny
MICHMECH45
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Like what?
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Monday, May 7th, 2012 AT 2:30 AM
Tiny
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Did my entire question come thru to you? I thought I was pretty thoroug
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Monday, May 7th, 2012 AT 2:31 AM
Tiny
ASEMASTER6371
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No, it did not

Roy
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Monday, May 7th, 2012 AT 2:40 AM
Tiny
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03 Buick Park Ave. A/c compressor doesn't come on after dealer engine change. System wasn't opened and is still charged - verified. I've checked the fuse and relay both test good. I hot wired the clutch and it works. There is 12v present at BOTH terminals of the compressor connector. Shouldn't one be a ground? Why would the ground show 12v+?
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Monday, May 7th, 2012 AT 2:46 AM
Tiny
ASEMASTER6371
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Because it is not grounded. I will check a wire diagram and see how it is grounded.

Roy
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Monday, May 7th, 2012 AT 2:51 AM
Tiny
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Could you please tell me where the ground is located too? I've seen the wiring diagram but don't know where the physical location is.
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Monday, May 7th, 2012 AT 2:55 AM
Tiny
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It is grounded by the pcm.

Roy
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Monday, May 7th, 2012 AT 2:58 AM
Tiny
MICHMECH45
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  • 8 POSTS
As in next to the pcm or internally by the pcm?
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Monday, May 7th, 2012 AT 3:02 AM
Tiny
ASEMASTER6371
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Internally.

Roy
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Monday, May 7th, 2012 AT 3:09 AM
Tiny
MICHMECH45
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  • 8 POSTS
Oh great. Problem could be with almost anything. This is beyond my ability to troubleshoot. I'm a state licenced mechanic with 27 years of experience but electrical / electronic issues are not my speciality. 27 years ago things were much easier to work on.
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Monday, May 7th, 2012 AT 3:20 AM
Tiny
MICHMECH45
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I think you don't know what your talking about. I'm flagging your reply for review. After studying the diagrams for power and ground distribution I find that theres an awful lot you've left out like splice packs and ground points. Also there is no direct connection between compressor ground and the PCM. At least you've gotten me to study the skematics.
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Monday, May 7th, 2012 AT 3:42 AM
Tiny
DJCL
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The computer does not control the ground on this car. It controls the relay that sends 12 volts out to the comp. It sounds like the relay is bad. Its not passing all the curent to the clutch. If you gave it 12 volts and used the ground that is there. And the clutch ran than the ground is good. Replace the relay or swap it with one of the others in the car.
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Monday, May 7th, 2012 AT 10:52 AM

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