For 1990-2009 cars

SYMPTOM | PROCEDURE
--- | ---
All blower motor speeds inoperative | Chart 1
Blower motor operates in HI speed anytime blower switch is activated | Chart 2
Blower motor operates in HI, but not in one or more of the other speeds | Chart 3
Blower motor operates in all models except HIGH 2000 model year | Chart 4
Blower motor operates in all modes except HIGH 2001 model year | Chart 5
No outside or inside air circulation - blower motor functions | Chart 6
A/C compressor does not operate | Chart 7
Mode doors motor not functioning | Chart 8
A/C compressor operates all the time | Chart 9
A/C or recirc switch indicator lamps do not light | Chart 10
Only HVAC lights do not illuminate or dim with I/P dimmer (all the lights for the other systems function correctly) |

• | Check for voltage between HVAC Control Head terminal B4 (GRA, circuit 8) and a known good ground with park lamps on. If no voltage is present, repair circuit 8.

• | If voltage is present at terminal B4 (circuit 8) and all other HVAC functions operate, faulty bulbs or control head.

• | Check HVAC dimmer operation.

### Chart 1

### Chart 2

### Chart 3

### Chart 4

### Chart 5

### Chart 6

### Chart 7

### Chart 8

### Chart 9

### Chart 10