Troubleshooting Hints - Rear Heater Blower Motor

1. CHECK for the condition of the HTR-A/C Fuse (Fuse 12). If the Fuse is open, LOCATE and REPAIR the source of the overload in Circuit 141.
Important: If this Fuse is open the Front Heat will not operate either.
2. CHECK the condition of the RR Heat/A/C MAXI Fuse M2. If the Fuse is open, LOCATE and REPAIR the source of the overload in one of the following areas: Rear Heater Blower Motor, Rear Heater Resistor Pack or the Heater and A/C Control Valve Solenoid (Rear Hot Water Valve).
3. CHECK the condition and seating of the Rear Heat-A/C Relay.
4. CHECK the condition at the Rear Heater Resistor Pack and the Rear Heater Blower Motor ground G301.
5. CHECK the operation of the Rear Heater Blower Motor. If it operates, problems with the Heater and A/C Control Valve Solenoid (Hot Water Valve) are indicated.
6. CHECK for proper Engine Coolant level.
^ Check for a broken (or partially broken) wire inside of the insulation which could cause system malfunction but prove GOOD in a continuity/voltage check with a system disconnected. These circuits may be intermittent or resistive when loaded, and if possible, should be checked by monitoring for a voltage drop with the system operational (under load).
^ Check for proper installation of aftermarket electronic equipment which may affect the integrity of other systems (See Diagnostic Aids for General Troubleshooting Procedures). Diagnostic Aids