A/C pump? i think - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 02-20-2005, 10:01 PM   #1
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Default A/C pump? i think

hey guys
when i first start my car i can sometimes hear a "clicking noise" like somethin is spinning and hitting something else. when i look in the engine compartment i believe it it the A/C Compressor.
i dont understand why it is making this noise?
if it makes the noise i will usually turn the A/C on for like a split second the noise stops!
umm i dunno if anyone else has had this problem but any info would be much appreciated.
also my ABS light is on i was wanderin what this would be from (obviously the ABS dont work) but im looking for more specifics. haha and what is involved in fixin it
sorry for the long post
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Old 02-21-2005, 12:12 AM   #2
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Not sure about the "clicking" but the ABS may be a bad sensor. The speed sensor is intergral to the hub and bearing so if that is it, you'll have to change the hub and bearing assembly. You can check it by pulling the plug at each wheel and check the continuity. No continuity means a bad sensor.
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Old 02-21-2005, 12:48 AM   #3
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The A/C compressor clutch can make a clicking noise when it engages. If your system is low on refrigerant, that can make the compressor cycle more frequently. To test if this is the problem, unplug the electrical connector to the A/C compressor clutch and see if the sound goes away.

[edit: Sorry, read your post more carefully. If the sound goes away when you turn on the A/C, maybe there is a mechanical problem with the compressor clutch that it is not freewheeling as it should. If you can watch it while someone else starts the car, maybe you will be able to see and hear to confirm the problem.]
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Old 02-21-2005, 02:26 AM   #4
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Sounds like the A/C clutch gap has decreased and is scraping. Have read this is a common problem with these compressors. I think the gap is supposed to be about .020” to .030” air gap.
If you are not familiar with this the clutch plate it is the thin outer plate (doo hickey) that does not move when the A/C is off. When the A/C is turned on a strong electric magnet sucks the clutch plate to the rotating pulley engaging the composer.
If the clutch plate is scraping you can adjust this on the car with a special tool.
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