On-Vehicle Inspection

WARNING: This page is about a different car, the 2003 Lexus LS 430. However, it is still accessible from the selected car via links, so may be relevant.

CHECK QUANTITY OF GAS DURING REFRIGERATION CYCLE
SET ON MANIFOLD GAUGE SET (See MANIFOLD GAUGE SET ).
RUN ENGINE
Run the engine at 1,500 RPM for at least 5 minutes.

Then check that the high pressure reading is 1.37-1.53 MPa (14-16 kgf/cm² , 199-228 psi).
CHECK EXPANSION VALVE
If the expansion valve is faulty, the low pressure reading will drop to 0 kPa (0 kgf/cm² , 0 psi), otherwise it is ok.

HINT:

When the low pressure drops to 0 kPa (0 kgf/cm² ,0 psi), check the receiver's IN and OUT side for no temperature difference.