Hummer H3. Manual — part 1300

3

1. Turn the ignition OFF.

2. Disconnect the recirculation actuator.

3. Turn the ignition ON, with the

engine OFF.

4. Connect a test lamp between the

recirculation door control A circuit
and the recirculation door control B
circuit of the recirculation actuator.

5. Place the recirculation switch in the

ON position.

Does the test lamp illuminate?

Go to Step 5

Go to Step 4

4

Connect a test lamp between the
recirculation door control B circuit of the
recirculation actuator and a good ground.
Does the test lamp illuminate?

Go to Step 7

Go to Step 8

5

Place the recirculation switch in the OFF
position.
Does the test light illuminate?

Go to Step 6

Go to Step 10

6

Inspect the recirculation door and the
recirculation actuator for the following
conditions:

A misaligned recirculation actuator-
Refer to Recirculation Actuator
Replacement (Left Hand Drive) or
Recirculation Actuator
Replacement (Right Hand Drive).

Broken or binding linkages or
recirculation door

An obstruction that prevents the
recirculation actuator from operating
within the full range of motion

Missing seals to the recirculation
door

Misaligned seals to the recirculation
door

2007 Hummer H3

2007 HVAC HVAC - Manual - H3

Did you find and correct the condition?

Go to Step 13

Go to Step 9

7

Test the recirculation door control A
circuit of the HVAC control assembly for
a short to ground, short to voltage, an open
and for a high resistance. Refer to Circuit
Testing and Wiring Repairs .
Did you find and correct the condition?

Go to Step 13

Go to Step 10

8

Test the recirculation door control B
circuit of the HVAC control assembly for
a short to ground, short to voltage, an open
and for a high resistance. Refer to Circuit
Testing and Wiring Repairs .
Did you find and correct the condition?

Go to Step 13

Go to Step 10

9

Inspect for poor connections at the harness
connector of the recirculation actuator.
Refer to Testing for Intermittent
Conditions and Poor Connections and
Connector Repairs .
Did you find and correct the condition?

Go to Step 13

Go to Step 11

10

Inspect for poor connections at the harness
connector of the HVAC control assembly.
Refer to Testing for Intermittent
Conditions and Poor Connections and
Connector Repairs .
Did you find and correct the condition?

Go to Step 13

Go to Step 12

11

Replace the recirculation actuator. Refer
to Recirculation Actuator Replacement
(Left Hand Drive) or Recirculation
Actuator Replacement (Right Hand
Drive).
Did you complete the replacement?

Go to Step 13

-

12

Replace the HVAC control assembly.
Refer to Heater and Air Conditioning
Control Replacement.
Did you complete the replacement?

Go to Step 13

-

13

Operate the system in order to verify the
repair.

2007 Hummer H3

2007 HVAC HVAC - Manual - H3

ACTUATOR RECALIBRATION

When replacing an air temperature, mode, recirculation actuator or the HVAC control assembly,
the following calibration process needs to be performed:

1. Turn ON the ignition with the engine OFF.

2. Turn the Temperature dial all the way to the right.

3. Turn the blower control dial all the way to the right.

4. Turn the mode position dial all the way to the left.

5. Simultaneously press and hold the A/C and Defrost buttons until the LED's start to flash.

6. Once the LED's stop flashing, calibration is complete.

REPAIR INSTRUCTIONS

HEATER AND AIR CONDITIONING CONTROL REPLACEMENT

Did you correct the condition?

System OK

Go to Step 3

IMPORTANT: Do not adjust any controls on the HVAC control assembly during

self-calibration. If interrupted, improper HVAC performance will
result.

2007 Hummer H3

2007 HVAC HVAC - Manual - H3

Fig. 21: HVAC Control Assembly Replacement
Courtesy of GENERAL MOTORS CORP.

Heater and Air Conditioning Control Replacement

AIR TEMPERATURE ACTUATOR REPLACEMENT - RIGHT SIDE (LEFT HAND DRIVE)

Callout

Component Name

Fastener Tightening Specifications: Refer to Fastener Tightening
Specifications.Preliminary Procedure: Remove the center instrument panel trim plate.
Refer to Instrument Panel Center Trim Panel Replacement (Left Hand Drive) or
Instrument Panel Center Trim Panel Replacement (Right Hand Drive) .

NOTE:

Refer to Fastener Notice .

1

HVAC Control Module Screw
Tip: Disconnect the electrical connector.

Tighten: 1.9 N.m (17 lb in)

2

HVAC Control Module

2007 Hummer H3

2007 HVAC HVAC - Manual - H3