Schematic Reference: HVAC Schematics

Connector End View Reference: HVAC Connector End Views

DEFINITION: Auxiliary air temperature can not be adjusted from one or both auxiliary controls or auxiliary heating is insufficient.

1

Did you review the HVAC operation and perform the necessary inspections?

Go to Step 2

Go to Symptoms - HVAC Systems - Manual

Important: The auxiliary air conditioning (A/C) system operates independently of the HVAC control assembly to provide heated airflow through the auxiliary system.

Does the HVAC control assembly operate and provide sufficient heating?

Go to Step 3

Go to Too Cold in Vehicle

1. Turn ON the ignition, with the engine OFF.
2. Place the Heat and/or A/C auxiliary blower motor switch in each speed position.

Does the auxiliary blower motor operate at all?

Go to Step 4

Go to Auxiliary Blower Motor Inoperative

Does the auxiliary blower motor operate correctly for each speed position?

Go to Step 5

Go to Auxiliary Blower Motor Malfunction

Is the vehicle equipped with an auxiliary A/C system?

Go to Step 6

Go to Step 8

1. Start the engine.
2. Place the mode switch in the OFF or FLOOR positions.

Does the A/C compressor operate?

Go to HVAC Compressor Clutch Does Not Disengage

Go to Step 7

Is the vehicle equipped with an auxiliary heating system?

Go to Step 8

System OK

Inspect the cooling system for the following:

Did you find and correct the condition?

Go to Step 11

Go to Step 9

Inspect for poor connections at the harness connector of the auxiliary heater blower motor switch. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 11

Go to Step 10

Replace the auxiliary heater blower motor switch. Refer to Heater Control Blower Switch Replacement .

Did you complete the replacement?

Go to Step 11

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Operate the system in order to verify the repair.

Did you correct the condition?

System OK

Go to Step 2