GM Service Manual Online
For 1990-2009 cars only

CJ2 Test Requirements

The following conditions must be met before you can perform the functional checks below:

  1. The engine must be running.
  2. The engine temperature must be at least 63°C (145°F).
  3. You must start from the AUTO mode.

The passenger temperature control is over-ridden and AUTO will not be displayed if:

    • The driver set temperature of 60°F is selected.
    • The driver set temperature of 90°F is selected.

The outside air temperature display is updated when:

    • The air temperature is decreasing.
    • The air temperature is increasing and the vehicle speed stays between 20 and 45 mph for 90 seconds.
    • The air temperature is increasing and the vehicle speed stays above 45 mph for 60 seconds.

When the outside air temperature is less than 35°F, the A/C compressor will not engage.

When the outside air temperature is between 35°F and 45°F, the A/C compessor might not engage.


Object Number: 191673  Size: SF

Object Number: 106095  Size: SF

Important: You must begin this test in the AUTO MODE.

CJ2 Functional Tests

Functional Test - Temperature Door

Operator ACTION

Operator Should OBSERVE

Step

 

Press Button

VF Display

Set Temperature

Fan Speed

Percent of Air Flow

Temperature

Comments

Driver

Pass

Windshield

Floor

I/P

Side Window

Driver

Pass

1

Defrost

(1)*

--

90°F

12 O'clock

7 Bars

85%

12%

--

3%

Hot

Hot

--

2

Defog

MODE

(2)*

90°F

12 O'clock

7 Bars

60%

32%

--

8%

Hot

Hot

--

3

Lower

MODE

(3)*

90°F

12 O'clock

7 Bars

28%

59%

--

13%

Hot

Hot

--

4

Upper

MODE

(4)*

60°F

12 O'clock

7 Bars

3%

7%

88%

1%

Cold

Cold

1

5

Bilevel

MODE

(5)*

60°F

12 O'clock

4 Bars

12%

29%

53%

7%

Cold

Cold

2

* The number in ( ) refers to the callout number on the graphic.

Comments:

  1. The operator should notice an increase in air rush noise when the system goes into the recirc mode.
  2. The operator should notice a reduction in air flow noise when the blower speed has changed.

Important: You must begin this test in the AUTO MODE.

CJ2 Functional Tests

Functional Test - Dual Zone System

Operator ACTION

Operator Should OBSERVE

Step

 

Press Button

VF Display

Set Temperature

Fan Speed

Percent of Air Flow

Temperature

Comments

Driver

Pass

Windshield

Floor

I/P

Side Window

Driver

Pass

1

Upper

AUTO

--

73°F

12 O'clock

AUTO

3%

7%

88%

1%

Cold

Cold

1

2

Upper

--

(4)*

70°F

5 O'clock

AUTO

12%

29%

53%

7%

Cool

Warm

2

3

Upper

--

(4)*

80°F

7 O'clock

AUTO

12%

29%

53%

7%

Warm

Cool

3

*The number in ( ) refers to the callout number on the graphic.

Comments:

  1. The driver and passenger side air temperature is the same.
  2. The passenger side air temperature is warmer than the driver side air temperature.
  3. The passenger side air temperature is cooler than the driver side air temperature.