Ac not blowing cold

1998 LEXUS GS 300
228,000 MILES • 6 CYL • 2WD • AUTOMATIC
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CHRISTA DICKSON
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  • 148 POSTS
My ac is not blowing cold I have emptied and refilled the freon with gauge correctly , the compressor is engaging like it's supposed to I can see and hear that and clutch works also it is blowing plenty strong it's just warm air that won't get cold. Any recommendations on what it could be?
May 3, 2019 at 6:50 PM
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JIS001
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You would need to install the gauge to the service ports low and high and read off the pressures. If high and low pressure readings are close then you have a bad compressor. You can pick up a set of gauges at harbor freight. Another thing to check with the gauges is for a bad expansion valve. Here are the instructions to check valve.

  1. CHECK QUANTITY OF GAS DURING REFRIGERATION CYCLE

 2. SET ON MANIFOLD GAUGE SET

 3. RUN ENGINE
    Run the engine at 1,500 rpm for at least 5 minutes.
    Then check that the high pressure reading is 1.37 - 1.57 MPa (14 - 16 kgf/sq cm, 199-228 psi).

 4. CHECK EXPANSION VALVE
    If the expansion valve is faulty, the low pressure reading will drop to 0 kPa (0 kgf/sq cm, 0 psi).

Please let us know what those readings are.
May 3, 2019 at 9:20 PM