Pickup 4WD L4-2366cc 2.4L SOHC (22R) (1984)
Control Module HVAC: Testing and Inspection
INSPECTION OF AIR CONDITIONER AMPLIFIER
1. CHECK ENGINE SPEED DETECTING CIRCUIT
a. Run the engine, and operate the air conditioner.
b. Check that the magnetic clutch disengages at the specific engine revolution.
CUT-OFF RPM: 600 - 700 RPM
If the cut-off rpm is too high, turn the adjusting knob clockwise to adjust.
If the cut-off rpm is too low, turn the adjusting knob counterclockwise to adjust.
2. CHECK TEMPERATURE DETECTING CIRCUIT
a. Remove the glove box.
b. Disconnect the thermistor connector and connect the variable resistor.
c. Run the engine and operate the air conditioning to get maximum cooling.
Air intake control: RECIRC
Air flow control: VENT
Temperature control: COOL
Blower control: HI
d. Measure the resistance of the variable resistor when the magnetic clutch engages and disengages.
If the resistance is not between the two lines, adjust the amplifier.
If the resistance is too high, turn the temperature adjusting screw clockwise.
If the resistance is too low or the evaporator is frosted, turn the temperature adjusting screw counterclockwise until the magnetic clutch engages at
the standard resistance.