Ac compressor jump - Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum



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Go Back   Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum > 2002 - 2009 TrailBlazer/Envoy Tech > The 02-09 "How-To" and DIY Section

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  #1  
Old 07-11-2019, 08:24 PM
Mjmcfarl3 Mjmcfarl3 is offline
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2004 Buick Rainier
Silver 5.3L V8 AWD
Join Date: Oct 2016
Location: Buffalo, NY
Posts: 8
Ac compressor jump

How do you "jump" the ac compressor to get it goin in a 5.3l v8 Buick rainer? Pictures would be best thank you!
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  #2  
Old 07-12-2019, 02:46 PM
EnvoyBoy2004's Avatar
EnvoyBoy2004 EnvoyBoy2004 is offline
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2004 GMC Envoy SLT
Graphite Metallic 4.2L I6 4X4
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There must be a reason why the compressor is not engaging, that needs to be addressed. Could be the system is low on freon, low pressure switch is bad, electrical problem, etc. "Jumping" will not result in a working HVAC system.
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Old 07-12-2019, 03:57 PM
Mjmcfarl3 Mjmcfarl3 is offline
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2004 Buick Rainier
Silver 5.3L V8 AWD
Join Date: Oct 2016
Location: Buffalo, NY
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I'm trying to get to ac to work. I live in florida now, about an hour away from Jacksonville and 1/2 hour from Gainesville, so ac is definitely needed!
I'm trying to see what the problem is, staring with the easiest/simplist problem.
Right now the system will not accept new freon, so I thought that if I could "jump" compressor I could possibly get some freon in.
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  #4  
Old 07-13-2019, 08:19 AM
NJTB04 NJTB04 is offline
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2004 Chevy TrailBlazer LS
Pewter Metallic 4.2L I6 4X4
Join Date: Aug 2012
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Unless you're sure it's low on freon, that's not a good idea.
The PCM monitors several sensors in the system, and if there's a bad reading, it will withhold permission for the a/c to run.
Try jumping the low pressure switch on the accumulator, if it runs the switch is bad or it's low on charge. There's also a way to jump the relay in the front fuse box, but I don't remember which terminals to cross, you'll have to search here.
FWIW, this system is far more complicated than it needs to be, but if you have access to a Tech 2 it damn near diagnoses it for you, if you know how to use it.
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Old 07-13-2019, 11:25 AM
Mjmcfarl3 Mjmcfarl3 is offline
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2004 Buick Rainier
Silver 5.3L V8 AWD
Join Date: Oct 2016
Location: Buffalo, NY
Posts: 8
Jumping the low pressure switch on the accumulator? Never heard of that
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