5000S Wagon L5-2226cc 2.22L SOHC (KZ) (1985)
Control Module HVAC: Adjustments
Note: Always check air temperature sensors before checking programmer calibration.
If programmer is out of calibration system may run slightly cooler or warmer than temperature selected on control head.
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Disconnect wires from evaporator air temperature sensor
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Using digital ohmmeter set resistance of VW 1301 to 113 ohm (roughly equal to scale number 208).
Four point test plug
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Connect VW 1301 to terminals S and A on 4 point test plug (wires are blue and blue/white).
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Connect digital voltmeter US 1119 to terminals W and N on 4 point test plug (red/green and brown wires).
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Set control head to Auto 75°F (24°C).
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Turn ignition "ON".
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Wait 2 minutes.
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Read voltage. Should read 3.95 to 4.0 volts. If voltage reading is not correct, continue.
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Insert small screwdriver into opening of programmer (arrow).
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Turn potentiometer until voltmeter reads 3.95 to 4.0 volts.
Note: An error of 0.2 volts means temp variation of 1° (.56°C). If voltage is under 3.95 volts, system runs too cool. If voltage is over 4.0 volts, system
runs too warm.