COMPONENT DIAGNOSIS PROCEDURES

CONDENSATE WATER DRAINAGE

Condensation that accumulates on the bottom of the evaporator housing is drained from a rubber tube through the dash panel and on to the ground. This tube must be kept open to prevent condensate water from collecting in the bottom of the heater A/C unit housing (Fig. 1).

BLOWER MOTOR VIBRATION AND/OR NOISE DIAGNOSIS

The resistor block (Fig. 2), supplies the blower motor with varied voltage (low and middle speeds) or battery voltage (high speed).

Fig. 1 Condensate Water Drain TubeÐTypical

The tapered end of the drain tube is designed to keep contaminants from entering the heater A/C unit housing. If the tube is pinched or blocked, condensate cannot drain, causing water to back up and spill into the passenger compartment. It is normal to see condensate drainage below the vehicle. If the tube is damaged, it should be replaced.

Fig. 2 Blower Motor Resistor BlockÐTypical

CAUTION: Stay clear of the blower motor and resistor block (Hot). Do not operate the blower motor with the resistor block removed from the heater-A/C housing.

Refer to the Blower Motor Vibration/Noise chart in this section for diagnosis.

BLOWER MOTOR ELECTRICAL DIAGNOSIS

Refer to the Blower Motor Electrical System Diagnosis chart in this section. Also refer to Group 8W, Wiring Diagrams for more information.