AC not blowing cold

CHRISTA DICKSON

MEMBER
1998 LEXUS GS 300
6 CYL
2WD
AUTOMATIC
228,000 MILES

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?

1 Reply

JIS001

MECHANIC
3,408 POSTS

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.