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Aircon intermittent

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Old 03-29-2014, 08:41 PM   #1
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Default Aircon intermittent

Hi Guys,...

My air con compressor will come on every once in a while, then cut out. So I know it works, but what could be causing this?

Thanks
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Old 03-30-2014, 11:24 AM   #2
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Quote:
Originally Posted by Tyson2busy View Post
Hi Guys,...

My air con compressor will come on every once in a while, then cut out. So I know it works, but what could be causing this?

Thanks
Don't know what year model Audi..90..Cabriolet..but they work pretty much the same.

Could be low on refrigerant..compressor comes on and the low side pressures drop below the threshold of the low pressure switch..then the compressor kicks off..low side pressure comes back up..compressor come back on line and engages.

An over charged system will do it too. High side pressure switch kicks the compressor out when the high side pressures go up.

Some A/C gauges and an low side adapter (yellow jacket #19153 ACME FEMx13mm) on the compressor port will tell the story.
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Old 03-31-2014, 02:55 PM   #3
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Interesting! Wow,..talk about a complicated system!

Thanks!
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Old 04-01-2014, 02:35 PM   #4
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There is also a thermal switch that will shut off the compressor if ambient temperature is too cold. If you are in the north country, it may still be too cold.
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Old 04-02-2014, 06:10 PM   #5
x19
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What kind of refrigerant is in system R-12 or R134a?
In either way, lower refrigerant in system is doing this and check the leakage in system if you can
or let professional tech do the evacuate and recharge system with right freon gas includes leakage test. x19
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Old 04-05-2014, 04:27 AM   #6
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Sounds low, I had the same issue.

You should run the AC in the winter once in awhile to leg the PEG oil keep the seals lubed, helps to cut down on leakage.

Evac and recharge fixed the issue.
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