Diesel Data: Automotive Repair

Blower Motor Speeds Incorrect - MTC

Test 1 - Test 3:




Test 4 - Test 6:






SYMPTOM
BLOWER MOTOR SPEEDS INCORRECT - MTC

POSSIBLE CAUSES
- Blower motor driver circuit(s) shorted to ground
- A/C - heater control
- Blower motor driver circuit(s) shorted to voltage
- Blower motor driver circuits shorted together
- A/C - heater control - speeds incorrect
- Blower motor driver circuit(s) open
- Blower motor resistor block - open speed