Electronic Climate Control

Allow sufficient time for the engine to warm and for the ECC system to turn on before attempting calibration.

Air Mix Valve Adjustment

1. Remove the glove box.

2. Set the temperature on the control panel for 9O°. Allow one or two minutes for the programmer arm to travel to its maximum heat position. See the above illustration.

3. Unsnap threaded rod from the plastic retainer on programmer output arm.

4. Check the air mix valve for free travel (push valve to max cool air and check for possible binding).

5. Pre-load air mix valve in the maximum heat position by pulling the threaded rod to ensure the valve is sealing. The programmer output arm should be aligned with the arrow on the programmer case.

6. Snap threaded rod into the plastic retainer on programmer arm. Do this carefully to avoid influencing the programmer arm or air mix valve position.

7. Set the temperature setting on the control panel for 60°. Check to verify that the programmer arm and air mix valve travel to the max A/C position.

Programmer Temperature Adjustment

1. Set the control panel at 75°F and AUTO.

2. Connect a voltmeter to the test lead from Pin W of the programmer and to ground.

3. Record this programmer voltage.

A. To increase the temperature setting one degree, increase the programmer voltage by 0.2 volt per degree Fahrenheit. (Use a small blade-type screwdriver to adjust the temperature adjustment potentiometer in the programmer for the required change in programmer voltage.)

B. To decrease the temperature setting one degree, decrease the programmer voltage by 0.2 volt per degree Fahrenheit.

Example:

A. If the panel is set at 75 and the passenger compartment is 4 too cold, then adjust the programmer voltage 0.8 volt higher than the recorded programmer voltage.

4° x 0.2 volt per degree F. = 0.8 volt

4.0 (recorded value) + 0.8 volt (voltage adjustment) = 4.8 volts (final programmer voltage)

B. If the panel is set at 75 and the passenger compartment is 5 too warm, then adjust the programmer voltage 1.0 volt lower than the recorded programmer voltage.

5 x 0.2 volt per degree = 1.0 volt

4.0 (recorded value) - 1.0 volt (voltage adjustment) = 3.0 volts (final programmer voltage)

4. Disconnect voltmeter and check comfort level of passenger compartment.