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Old 07-13-2010, 09:49 PM   #1
hoffmanEstates
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Angry ac issues compressor running

i am encountering a wierd issue my ac compressor is constantly running. i sucked the system down and put a 30min vacum draw down to -30in. recharged and still no change. it used to cycle. what am i missing on testing
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Old 07-13-2010, 11:24 PM   #2
Wrencher86
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How hot is it outside? Is it blowing cold out the vents? If it's still cooling properly I'm not sure I'd worry about it.
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Old 07-14-2010, 02:59 AM   #3
caterpill
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Is your suction line frosting up?

Your low-pressure cycling switch might not be working - your a/c won't blow warm, but if your evaporator ices up, the air blowing through the vents will start to diminish.
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Old 07-14-2010, 03:23 PM   #4
hoffmanEstates
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sounds familiar. so you mean low psi switch is going bad? how do i test such a switch? or any other switches
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Old 07-16-2010, 03:11 AM   #5
caterpill
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Oops, I retract my previous statement. Subarus use a a TXV setup, not like most CCOT setups on domestics.. LOL DUH.

I'm sorry, there is no such "low pressure switch" on subarus. I wasn't thinking.

A/C compressor clutch cycling is controlled by the "thermo control amplifier", which is the thermal expansion valve.

It'll cut power to the a/c compressor clutch before the evap. core frosts up.

Like someone said previously, if your a/c is cold, it's probably not a cause for concern. You do need to do further troubleshooting, though, if you go WOT and your a/c compressor still stays on.

Try running your a/c on the recirc setting, at the lowest blower speed at night time. Let it idle and run the car.. see if you see any frosting of the low side a/c lines and the compressor still does not cycle out, you may have a problem.
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Old 07-17-2010, 11:18 AM   #6
datwrx
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I having the same damn problem. The AC is not leaking and the compressor is working fine. The only thing I can think of is the expansion valve. I hope to change it soon and see if works. Subaru AC system sucks.
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Old 07-18-2010, 10:20 PM   #7
ep3smoker
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[quote=caterpill;31324361]

A/C compressor clutch cycling is controlled by the "thermo control amplifier", which is the thermal expansion valve.

It'll cut power to the a/c compressor clutch before the evap. core frosts up.



the thermo control amp and expansion valve are two different parts.
is the ac cooling?
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Old 07-18-2010, 10:52 PM   #8
hoffmanEstates
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yes a/c sucks i just "refreshed" the system and STILL its blows cheap cold air i hope into a 94 lumina and it was like a freezer
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Old 07-18-2010, 11:19 PM   #9
ep3smoker
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how much refrigerant did you put in it?

Quote:
Originally Posted by hoffmanEstates View Post
yes a/c sucks i just "refreshed" the system and STILL its blows cheap cold air i hope into a 94 lumina and it was like a freezer
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