Test H

PINPOINT TEST H: INSUFFICIENT, ERRATIC OR NO HEAT

Test H1-H4:

Test H5-H7:

Test H8-H9:

Test H10-H11:

Test H12-H13:

Test H13-H14:

Test H14-H15:

Test H16:

Normal Operation
Under normal operation, the coolant control valve receives battery voltage through circuit 30-FB3 (RD/OG). The coolant control valve is provided a ground through circuit 91S-FB3 (BN/BU) and/or 91S-FB4 (BN/GN) from the Dual Automatic Temperature Control (DATC) module, depending on which side of the heater core that warm coolant is to flow through.

Possible Causes
- An open in circuit 30-FB3 (RD/OG), 91S-FB3 (BN/BU) or 91S-FB4 (BN/GN).
- A short to ground or voltage in circuit 91S-FB3 (BN/BU) or 91S-FB4 (BN/GN)
- Coolant control valve.
- DATC module.
- Thermostat.
- Evaporator discharge air temperature sensor.