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73-87 Chevy _ GMC Trucks => Interior & Equipment => Heating, Ventilation & Air Conditioning (HVAC) => Topic started by: jsc on March 19, 2021, 05:21:43 am

Title: AC Compressor cycling
Post by: jsc on March 19, 2021, 05:21:43 am

Hi!  I've got an '83 C10, which just came out of the shop after having some carb and exhaust issues.  But now my AC compressor is "cycling" on regular intervals, about every 5 seconds.  I can hear it click from inside the cab, and I can watch it cycle on and off when I'm under the hood.  AC is not blowing cold, even though it was before it went into the shop.

Any thoughts?  It always frustrates me when I put a vehicle in the shop, only to find a new problem when I get it out.....

Thanks,

John

Title: Re: AC Compressor cycling
Post by: Rapid Roy on March 19, 2021, 06:19:18 am

Usually low on freon.

Title: Re: AC Compressor cycling
Post by: JohnnyPopper on March 22, 2021, 10:17:46 pm

The Rapid One is correct...

Was your AC solid before? Had you serviced it recently?

Do you regularly use this shop?

I know I , too many questions but you/we need to start somewhere before making aSSumptions.

Title: Re: AC Compressor cycling
Post by: Mike81K10 on March 22, 2021, 11:06:18 pm

Don't use your A/C until it is serviced. Being low on freon can damage the compressor. If you have a leak, you can lose oil as well. Try to see if you can find a leak.

Title: Re: AC Compressor cycling
Post by: JohnnyPopper on March 22, 2021, 11:16:42 pm

Good call by Mike.

Look for oil leaks around the tubing/fittings, not hard to spot.

Title: Re: AC Compressor cycling
Post by: jsc on March 25, 2021, 05:22:45 am

Thanks.  Yes, I've used the shop before.  And yes, it was running correctly before I put it in for service.  It's sat in my garage since, so I haven't run it. 

I guess I was wondering if it could be electrical at all.  Squarebodies usually have some demons electrically, 

Title: Re: AC Compressor cycling
Post by: JohnnyPopper on March 25, 2021, 11:21:23 am

One good thing the factory did was install a pressure sensor, that when too low, will not allow 12v to go to the compressor magnetic clutch.

Could just be coincidence that the gas went low after the visit. You can buy refrigerant with a pressure gauge and tell right away. If you're in Cali (too bad for us) the can will cost you a refundable 10.00 when you bring it back (Within 30 days!) 

Title: Re: AC Compressor cycling
Post by: jsc on March 25, 2021, 08:41:27 pm

Thanks.  I'm feeling better about it all

Title: Re: AC Compressor cycling
Post by: JohnnyPopper on April 29, 2021, 10:37:08 pm

So what ever happened?    ???