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Is my a/c simply low on refrigerant?

tomibriggs on Tue July 14, 2009 10:12 PM User is offline

Year: 1996
Make: Toyota
Model: Corolla
Engine Size: 1.8L
Refrigerant Type: 134
Ambient Temp: 90
Pressure Low: 8
Pressure High: 149
Country of Origin: United States

Please disregard my previous posts. Below are the most accurate readings and conditions that I can provide you guys with so you can help me diagnose the problem of my a/c.

Problem: A/C not cooling well when the vehicle is idling and stationary. Gets better on highway speeds.

History: Compressor & Receiver/Drier was replaced 4 years ago. I am assuming that the system was properly vacuumed and recharged since it was done by a shop.

Observation: Temp on both inlet & outlet pipes of the Receiver is the same - warm
Temp on the inlet pipe of the Evaporator is hot while outlet pipe is cold(not super cold) and no sweating/moisture.
Constant hissing sound near the evaporator
Condenser fan is working properly


Pressure Readings:

At idle:
Hi side = 140psi
Low side = 25psi

At 1500rpm:
Hi side = 149psi
Low side = 8psi

What is wrong with my system? Am I simply very low on refrigerant charge?

THANK YOU in advance for your help!

Chick on Tue July 14, 2009 10:22 PM User is offlineView users profile

At 90 degrees you appear undercharged, I would recommend recovering the refrigerant, pulling a deep vacuum and recharge to factory specs, you might want to add some UV dye to help in finding your leak, it may be minimal since it took four years to lose cooling.. Hope this helps..

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Chick
Email: Chick

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Freedoms just another word for nothing left to lose

tomibriggs on Tue July 14, 2009 10:34 PM User is offline

Ok. Thank you!

What would be the proper pressure reading at 90 - 95 ambient temp?

TRB on Tue July 14, 2009 10:40 PM User is offlineView users profile

System should be charged by weight, 23 to 26 ounces.

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Cussboy on Tue July 14, 2009 11:22 PM User is offline

Quote
Originally posted by: tomibriggs
Ok. Thank you!



What would be the proper pressure reading at 90 - 95 ambient temp?


Closer to low 30-35, and high 220-230. But I agree to evacuate and recharge with correct amount. And there is no "simply" about it: because if you have lost refrigerant - the reason for all this - then you need to find and fix the leak or you're just wasting your time.

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