AC works only for the first 30 minutes

Tiny
CHUCK_PASADENA
  • MEMBER
  • 1995 TOYOTA PREVIA
  • 4 CYL
  • FWD
  • AUTOMATIC
For the first 30 minutes, AC blows cool air. But after 30 minutes, it starts to blow warm air. Then after 45 minutes, it starts to blow hot air. What might be the causes?
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Sunday, June 28th, 2015 AT 5:18 PM

3 Replies

Tiny
OBXAUTOMEDIC
  • EXPERT
Hello,

If it starts out only blowing Cool Air, Not Cold and turns warm to hot I would think low charge. Would have it checked, recharged if needed and have a dye added to check for leaks.
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Sunday, June 28th, 2015 AT 7:52 PM
Tiny
CHUCK_PASADENA
  • MEMBER
Thank you for the quick reply. If my AC is low charge due to leakage, should I expect no cool air at all at the first 30 minutes? Also, should I expect the problem gets worse if I don't deal with it? Thank you again.
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Sunday, June 28th, 2015 AT 10:05 PM
Tiny
OBXAUTOMEDIC
  • EXPERT
OK, how long has it been blowing cool air? It is a good possibility that it is just low on charge I myself will always when I do recharge put in a dye to be able to test for leaks if happens again in short period of time like a month or so.

Can you hear the A/C Compressor kicking in and out every 5 or so seconds, if so good indication of low charge. Another possibility is a Clogged Orifice Tube which is in the line somewhere.

Here is what I do -

1) Charge a/c to include Lead Detection Dye - If starts blowing Cold Air and Gauges show full on both High & Low side done.

2) If Charge doesn't work - Check for leaks using UV Light - Make Sure to Check the Condenser in front of the Radiator.

3) If No Leaks Found - will find Orifice Tube and Replace

After that if still doing same I would check Blend Doors, if they are working properly then most likely the A/C Compressor is bad.
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Monday, June 29th, 2015 AT 7:33 AM

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