Did you perform the HVAC Diagnostic System Check?

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Go to Step 2

Go to Diagnostic System Check

1. Disconnect the blower motor resistor connector.
2. Place the ignition switch in the RUN position.
3. Place the heater-A/C control in the VENT position.
4. Place the blower switch in the M2 position.
5. Use a test lamp to backprobe between blower motor resistor connector terminal A and ground.

Does the test lamp light?

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Go to Step 3

Go to Step 4

Replace the blower motor resistors. Refer to Blower Motor Resistor Replacement .

Is the repair complete?

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Go to Step 7

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1. Place the ignition switch in the OFF position.
2. Disconnect the heater-A/C control connector C1
3. Use a test lamp, connected to B+, to backprobe the heater A/C control connector C1 terminal F, CKT 72 (LT BLU).

Does the test lamp light?

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Go to Step 6

Go to Step 5

Locate and repair a poor connection or an open in CKT 72 (LT BLU). Refer to Testing for Intermittent Conditions and Poor Connections and Wiring Repairs in Wiring Systems.

Is the repair complete?

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Go to Step 7

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Replace the heater-A/C control. Refer to Control Assembly Replacement .

Is the repair complete?

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Go to Step 7

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Verfiy that the system operates properly .

Does the system operate properly ?

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System OK

Go to Symptoms