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99 suburban k1500 a/c compressor won't come on
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bruceglaser
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May 31, 2009, 11:47 AM
Post #1 of 6
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99 suburban k1500 a/c compressor won't come on
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i have a 99 suburban k1500, 5.7 v8, 4 wdr, i have checked the fuse under the dash, replaced the a/c relay in the fuse box under the hood, tried a different used compressor. when i start the vehicle, turn the a/c switch on , the light on the switch comes on, turn the fan on, i have juice ad ground at the front plug on the compressor, have tried to bypass, or loop, the low pressure switch, the only thing i haven't checked, because i am not sure what it is supposed to do, is check the plug on the back of the compressor, 2 wire plug, not sure what thats for . i need help please. thanks, Bruce.
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Hammer Time
Ultimate Carjunky
/ Moderator
May 31, 2009, 1:47 PM
Post #2 of 6
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Re: 99 suburban k1500 a/c compressor won't come on
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Did you say that you have both power and ground at the compressor plug?
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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bruceglaser
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May 31, 2009, 4:34 PM
Post #3 of 6
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Re: 99 suburban k1500 a/c compressor won't come on
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yes, i d have power and ground at the front plug for the compressor
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Hammer Time
Ultimate Carjunky
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May 31, 2009, 5:00 PM
Post #4 of 6
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Re: 99 suburban k1500 a/c compressor won't come on
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Then you just have a bad compressor clutch. That eliminates everything else.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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Sidom
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May 31, 2009, 5:36 PM
Post #5 of 6
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Re: 99 suburban k1500 a/c compressor won't come on
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I'd have to go along with a bad clutch if you have power & ground @ the compressor connector. The only curious thing is, you said you tried a used compressor. I suppose it's possible to have 2 bad clutches, I'm assuming you checked the air gap & it's between .050 & .076 mm.
I think I would like to know how you check for power & ground on that compressor connection......
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Tom Greenleaf
Ultimate Carjunky
/ Moderator
May 31, 2009, 6:39 PM
Post #6 of 6
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Re: 99 suburban k1500 a/c compressor won't come on
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If air gap alone was the trouble than tapping on the hub would engage it and it can be adjusted to more like .020 to fix that,
T
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