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Old 05-10-2011, 09:06 AM
flyoil flyoil is offline
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Default AC won't cycle

hey guys, just like that, my AC stopped cycling. Now it is running all the time and I don't know why. Nothing wrong with cabin switches as AC will turn on and off; but once it is on, it just keep on running. any ideas? or how to troubleshoot?
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Old 05-10-2011, 09:12 AM
FireRanger FireRanger is offline
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Default Re: AC won't cycle

Probably the pressure switch on the compressor.
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Old 05-10-2011, 09:14 AM
flyoil flyoil is offline
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Default Re: AC won't cycle

Quote:
Originally Posted by FireRanger View Post
Probably the pressure switch on the compressor.
thanks FR. I'll look there and report back.
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Old 05-10-2011, 09:15 AM
djfllmn djfllmn is offline
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Default Re: AC won't cycle

or a frozen compressor clutch
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Old 05-10-2011, 10:24 AM
flyoil flyoil is offline
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Default Re: AC won't cycle

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Originally Posted by djfllmn View Post
or a frozen compressor clutch
Ok, it's not a frozen compressor. I disconnected the low pressure switch while compressor was running, crossed my fingers, and it stopped working. It appears low pressure switch has gone bad. I hope that's all it is.....
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Old 05-10-2011, 01:05 PM
DHEM DHEM is offline
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Default Re: AC won't cycle

if you can try to get some gauges hooked up to find what psi the high and low side is running at
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Old 05-10-2011, 11:39 PM
2ZZGE05 2ZZGE05 is offline
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Default Re: AC won't cycle

Quote:
Originally Posted by DHEM View Post
if you can try to get some gauges hooked up to find what psi the high and low side is running at
This.

The pressure switch makes sure the compressor doesn't engage if the refrigerant level is too low. Too low refrigerant can damage the compressor because the lack of lubrication of the oil the floats in the refrigerant. So it might be as simple as just to add refrigerant to your system.
Get a set of A/C gauges and check psi on the low/high sides. Expect 20-40psi on the low and 150-250psi on the high. if both pressures are low than you're low on refrigerant.
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