a/c problem

TOYOTA COROLLA
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BOND007
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  • 5 POSTS
Hey Guys i have a 1995 toyota corolla 4AFE automatic transmission. my problem is that recently i noticed a sound coming from the compressor and what i have also noticed is that the compressor used to trip in snd out at intervals is not doin it now when the car runs for a while and also the a/c doesnt blow that cold when all this is taking placed and the car is stopped or parked, however it works ok when the car is moving. the system seems properly charged. I have changed some components jus about a year ago because of a system leak. these components are the evaporator core, the drier and the expansion valve. I would appreciate any help u guys could give me in solving the problem i am now having. could this problem be due to a faluty sensor or control module?
May 30, 2006 at 3:39 AM
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LOSONE
  • ✓Experienced Mechanic
  • 1,616 POSTS
1st you can't think it has the proper charge without putting on some gauges. Low side should be 35-40 high side 175-200. I suspect your low side is less than 20 and your high side is about 140. Let me know
May 30, 2006 at 10:42 AM
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BOND007
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Will check it out and let you know. Thanks. I must also point out though that in the night it seems to operate normal. the compressor trips out as it should and i dont get that whirming sound and there are no bubbles in the sight glass while in the day it is the opposite, this is when the car is in idle though. could anything else other than a low charge cause the bubbling in the sight glass other than a low charge?
May 31, 2006 at 2:06 AM
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LOSONE
  • ✓Experienced Mechanic
  • 1,616 POSTS
Sometimes air will get in the system and cause bubbles but it is rare. With 134A the loss and or no bubbles don't give you a charge indication. That was a carry over from R-12 freon. The ONLY way to check proper charge is with a set of gauges hooked to the suction and discharge lines.

The reason it operates a little better at night is the temperature of the refrigerant is lower with allows the super heat conduction to be better. You can achieve the same thing by running water on your condenser. That alone tells me you have a low refrigerant charge. Classic AC operation. Good luck
May 31, 2006 at 9:02 AM
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BOND007
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  • 5 POSTS
Thanks. I'll check it out and let you know.
May 31, 2006 at 10:35 AM
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