GM Service Manual Online
For 1990-2009 cars only

Item Measured

Preset Controls

Fan - OFF

Temp - 56°C (74°F)

Mode - Floor

Outside Air OFF

Recirc Air OFF

A/C Request OFF

Rear Defog OFF

Fan - Max Speed

Temp - Max Hot

Mode - Floor

Outside Air ON

Recirc Air OFF

A/C Request OFF

Rear Defog OFF

Fan - Max Speed

Temp - Max Cold

Mode - Upper Vent

Outside Air ON

Recirc Air OFF

A/C Request ON

Rear Defog OFF

Fan - Auto

Temp - 56°C (74°F)

Mode - Auto

Outside Air ON

Recirc Air OFF

A/C Request OFF

Rear Defog OFF

Engine Idling/Closed Loop/Park/Doors Closed/Windows Closed/Ambient Air Temp. 22-27°C (70-80°F)

Outside Air Temperature

27°C (80°F)

26°C (79°F)

27°C (80°F)

27°C (80°F)

Inside Air Temperature

28°C (81°F)

29°C (82°F)

26°C (79°F)

26°C (79°F)

Upper Outlet Temperature

17°C (62°F)

21°C (69°F)

9°C (49°F)

19°C (67°F)

Lower Outlet Temperature

25°C (75°F)

51°C (124°F)

16°C (61°F)

23°C (73°F)

Solar Sensor

231 Counts

231 Counts

231 Counts

231 Counts

Mix Door Maximum Position

200 Counts

200 Counts

200 Counts

200 Counts

Air Mix Door Commanded

48 Counts

200 Counts

48 Counts

48 Counts

Air Mix Door Actual

49 Counts

200 Counts

47 Counts

50 Counts

Mix Door Minimum Position

48 Counts

48 Counts

48 Counts

48 Counts

Blower Motor PWM Speed

0%

96%

96%

13%

Mode Selection Position

Floor

Floor

Upper Outlet

Auto

A/C Request

No

No

Yes

No

A/C LED ON

OFF

OFF

ON

OFF

Rear Defog Switch

OFF

OFF

OFF

OFF

Select Solenoid 1

ON

ON

OFF

OFF

Select Solenoid 2

OFF

OFF

ON

ON

Select Solenoid 3

ON

ON

ON

ON

Select Solenoid 4

OFF

OFF

OFF

OFF

Select Solenoid 5

OFF

OFF

OFF

OFF