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A/c Question


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Hello, I have a 92 es300 and the A/C has stoped blowing cold air. I checked the site glass and the liquid is clear with no bubbles. Is there anything else I can check? I did run the A/C diagnostic on the climate control and got no error codes. Any help would be greatly appreciated. Thanks.

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It is probably a sticking expansion valve. This is a very common problem in the ES models from the early to mid-90's. This has been discussed numerous times in this forum. Do a search, and you'll learn all about it.

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Hello, I have a 92 es300 and the A/C has stoped blowing cold air. I checked the site glass and the liquid is clear with no bubbles. Is there anything else I can check? I did run the A/C diagnostic on the climate control and got no error codes. Any help would be greatly appreciated. Thanks.

Absent COLOR having been added to the refrigerant the sight glass will look the SAME empty vs FULL of liquid. The way to check is to WATCH the sight glass for "transitional" bubbles just as the A/C compressor cycles on or as the liquid refrigerant is depleting before the compressor cycles back on.

Assuming the compressor is actually cycling on it will only do that with at least a minimum level of refrigerant system pressure. There is a limit switch lockout of the compressor clutch if the system pressure is so low the compressor might be damaged. If you move the temperature to MAX COOL all of the sensors are over-ridden....

If the OAT sensor behind the front bumper is open, indicating sub-freezing temperatures, the compressor will be disabled.

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