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Compressor Will Not Cycle


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jmh51193
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Aug 24, 2009, 5:15 PM

Post #1 of 12 (1413 views)
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I recently got my ac recharged and ever since my compressor just stays on. It wont cycle. What could be the problem?


Sidom
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Aug 24, 2009, 5:35 PM

Post #2 of 12 (1407 views)
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Might not be any problem....depends on what type of system you have. Is it getting cold?






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Hammer Time
Ultimate Carjunky / Moderator
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Aug 24, 2009, 11:56 PM

Post #3 of 12 (1405 views)
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It could be overcharged or it could just be normal. It will only cycle if the pressure drops low enough and that usually won't happen on "high" blower setting at idle.




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jmh51193
Novice

Aug 25, 2009, 5:24 AM

Post #4 of 12 (1399 views)
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It wont even cycle on the lowest setting. It used to cycle on high before the recharge


Hammer Time
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Aug 25, 2009, 5:39 AM

Post #5 of 12 (1396 views)
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That would be because it needed a recharge...........

That's the first sign of low refrigerant is short cycling. It won't cycle unless the pressure drops below 24 PSI so if you have a gauge, you can check it.




~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



Tom Greenleaf
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Aug 25, 2009, 6:38 AM

Post #6 of 12 (1392 views)
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What is this vehicle anyway? Cycling is a matter of load, charge and temps. Pressures and temps need be taken and leaks fixed if found,

T
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Long retired now


jmh51193
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Aug 25, 2009, 5:08 PM

Post #7 of 12 (1380 views)
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98 chevy 1500. 5.7


Tom Greenleaf
Ultimate Carjunky / Moderator
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Aug 25, 2009, 5:31 PM

Post #8 of 12 (1376 views)
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Guess: It's a Vortec with Delphi POS compressor leaking like a sieve. Green dye (UV) but you can still see it on body of the typical OE ones with dye used when new.

They use Teflon in those which ruins condenser and if left to cycle too much in high heat it will self destruct.

You need to post pressures and the temps at what RPMs at what A/C settings. That or brace for a few grand if a single system - more if dual! Takes money and know how to do this yourself but you can save some impeding damage,

T
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Long retired now


Hammer Time
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Aug 25, 2009, 11:51 PM

Post #9 of 12 (1368 views)
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Answering the original question and ignoring the leak issue for the moment, the lack of cycling is completely normal for a fully charged system on a hot day.




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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



Tom Greenleaf
Ultimate Carjunky / Moderator
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Aug 26, 2009, 12:33 AM

Post #10 of 12 (1362 views)
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So correct - lack of cycling IS normal is hot enouth and the system fully taxed/maxed out. Unseen or noticed it probably normally would cycle at highway speeds.

The temps and assorted obserations would tell tons as to wether this is a problem or not,

T
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Long retired now


jmh51193
Novice

Aug 26, 2009, 5:22 AM

Post #11 of 12 (1353 views)
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It leaked around the ports and they were replaced before the recharge. So hopefully that fixed the problem. I guess I will just run my ac. I was scared I was going to burn up my compressor or something thanks.


Tom Greenleaf
Ultimate Carjunky / Moderator
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Aug 26, 2009, 5:57 AM

Post #12 of 12 (1350 views)
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IMO and with some experience: Don't worry about a non cylcling compressor when you watch it at idle speeds. It will shut off by itself with excessive pressure or low pressures which mean two things - it's cold enough or low on charge.

When and if your hear that POS compressor make noise get it unplugged that moment and get a new Sanden clone for it before it can destroy more. Got the T-Shirt!

T
_________________________________________
Long retired now




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