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A/C Compressor - How to Jumper?

This is a discussion on A/C Compressor - How to Jumper? within the GM Trucks forums, part of the Vehicle Specific category; I am working on the AC system in our '07 Suburban. Last night I was able to locate a leaking ...

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    A/C Compressor - How to Jumper?

    I am working on the AC system in our '07 Suburban. Last night I was able to locate a leaking line to the rear AC unit after partially charging the system with refrigerant. While recharging, I attempted to jumper the low pressure switch on the drier and I still could not make the compressor engage. When I push the AC button on the HVAC panel, the light blinks a couple of times and then goes out. Is there something else I need to do to engage the compressor? The service manual is about useless on the recharging procedure.

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    I received the rear block off kit this morning and will be attempting to get the system up and running tomorrow.

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    Former Mopar Man 2002ssslp's Avatar
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    What a shame that an 07 vehicle is having A/C trouble already. I hope the new systems are better engineered. BTW. I have a 1998 Jeep Cherokee with 262k and the A/C still works. I guess I'm one of the lucky ones.
    My ride is a 2002 Camaro SS SLP #3296 with 30k, LTH, 3" Y, CME, Frost tune, K&N, ported TB, Blackwing lid, Bellows, MSD, Denso Iridium, and 85mm MAF, Bilsteins, Eibach springs, SLP strut brace, Adj. Panhard, TA Girdle, UMI, Pro 5.0, Nitto NT555
    My wife has a 2004 GTO with the rare SAP, 18" wheels, K&N Cold Air System, MSD, Ported TB, Frost tune, Denso Iridium, Flowmaster cat-back, 3200 Yank, 75k

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    Former Mopar Man 2002ssslp's Avatar
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    Jeff, these systems are still the old design and I do not believe the BCM has anything to do with the operation so that being said, did you check for 12v at the fuse, relay and clutch ?

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    I'm not sure what the issue was. I installed the rear block off kit this morning, and then sucked it down to 26 inches of vacuum. It held that for an hour, so then I let the vacuum pump run for a good 35-40 minutes before charging it. Part way through the first can the compressor started working and with the second can going in I jumpered the low pressure switch and the compressor ran like it should. No clue why I couldn't make it spin the other day.

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    Reviving this thread from last year -

    Well, I have hope that the winter freeze will be departing and that the weather will eventually get warm again. As I prefer being cold rather than hot, working AC is a must in our daily drivers. After blocking off the rear A/C lines last year and recharging the system, I once again had cold air in our Suburban. The only issue is that I am now getting a "sucking" sound that seems to emanate from the passenger footwell whenever I run the A/C. The sound is regular and happens around every 30 seconds or so, lasting only about 2-3 seconds each time. It does this no matter what the setting on the HVAC panel, so long as the A/C is activated, and does not seem related to compressor engagement. Any clue?

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    not sure if this really helps you much and I'm not real experienced with a/c stuff other than a basic charge but this link has some good info. Is it a gurgling sound? I've had that sound from a clogged condensation drain line which is in the same area you're hearing it. May want to fish a coat hanger up that line and see if it's clogged.


    a/c link

    Air Conditioner A/C Compressor Failure

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    Darn good info, thanks!

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