Vehicle check
Front A/C Expansion Valve
1. Check the amount of refrigerant.
2. Install the gauge block.
3. Set the front air conditioner switch to "ON" (Included), and the fan switch to the position "HI" (High speed).
4. Set the speed to about 2000 rpm and let the engine run for about 5 minutes.
5. Check the expansion valve.
If the expansion valve is clogged, the low pressure gauge shows normal and only the rear air conditioner operates.
Rear air conditioner expansion valve
1. Set the rear air conditioner switch to "ON" (Included), and the rear fan switch to the position "HI" (High speed).
2. Check the expansion valve in the same manner as the front air conditioner expansion valve.
Note: If the low pressure gauge is normal and no cold air is coming out of the rear cooling unit, then check the expansion valve for proper operation.