The numbers below refer to the step numbers on the diagnostic table.
Checks for proper operation of the heater water valve.
Checks for proper system vacuum at the heater water valve.
Checks for a circuit fault in the control circuit of the heater water valve.
Step | Action | Yes | No |
---|---|---|---|
Schematic Reference: HVAC Schematics Connector End View Reference: HVAC Connector End Views DEFINITION: Auxiliary heat is too hot. | |||
1 | Did you review the HVAC operation and perform the necessary inspections? | Go to Step 2 | |
2 | Does the HVAC control assembly operate and provide sufficient cooling? | Go to Step 3 | Go to Too Hot in Vehicle |
3 |
Does the heater auxiliary blower motor operate at all? | Go to Step 4 | |
4 | Does the auxiliary blower motor operate correctly for each speed position? | Go to Step 5 | |
Are the auxiliary heater hoses or auxiliary heater core hot? | Go to Step 6 | Go to Step 9 | |
Disconnect the vacuum hose from the heater water valve. Is there vacuum present at the h heater water valve vacuum hose? | Go to Step 7 | ||
Does the test lamp illuminate? | Go to Step 8 | Go to Step 9 | |
8 | Test the heater water control solenoid control circuit of the heater water valve solenoid for a short to voltage. Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition? | Go to Step 13 | Go to Step 10 |
9 | Inspect for poor connections at the harness connector of the heater water valve solenoid. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs . Did you find and correct the condition? | Go to Step 13 | Go to Step 11 |
10 | 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 . Did you find and correct the condition? | Go to Step 13 | Go to Step 12 |
11 | Replace the heater water valve. Refer to Heater Water Valve Replacement . Did you complete the replacement? | Go to Step 13 | -- |
12 | Replace the auxiliary heater blower motor switch. Refer to Heater Control Blower Switch Replacement . Did you complete the replacement? | Go to Step 13 | -- |
13 | Operate the system in order to verify the repair. Did you correct the condition? | System OK | Go to Step 2 |