Hummer H2. Manual — part 1968
NOISE DIAGNOSIS - BLOWER MOTOR
Noise Diagnosis - Blower Motor
11
Repair the heating concern. Refer to Heating
Performance Diagnostic .
Is the repair complete?
Go to
Step 14
-
12
Repair the A/C performance concern. Refer to Air
Conditioning (A/C) System Performance Test .
Is the repair complete?
Go to
Step 14
-
13
Repair the recirculation door concern. Refer to Air
Recirculation Malfunction in HVAC Systems -
Automatic.
Is the repair complete?
Go to
Step 14
-
14
Operate the system in order to verify the repair.
Did you find and correct the condition?
System
OK
Go to Step 2
Step
Action
Yes
No
DEFINITION: Noise originating from the blower motor.
1
Were you sent here from Symptoms or another
diagnostic table?
Go to
Step 2
Go to Symptoms - HVAC
Systems - Automatic in HVAC
Systems - Automatic
2
Inspect the air inlet grille for debris.
Is debris present?
Go to
Step 8
Go to Step 3
3
1. Sit inside the vehicle.
2. Close the vehicle doors and windows.
3. Turn ON the ignition, with the engine OFF.
4. Cycle the blower motor through all of the
speeds and modes in order to determine where
and when the noise occurs.
Is a noise evident during the blower operation?
Go to
Step 4
Go to Step 12
4
Inspect for excessive vibration at each blower motor
speed by feeling the blower case.
Is excess vibration present?
Go to
Step 6
Go to Step 5
5
Listen to the blower motor at each speed.
Is the blower motor making a squeaking or chirping
noise?
Go to
Step 9
Go to Step 12
6
1. Remove the blower motor. Refer to Blower
Motor Replacement .
2. Inspect the blower motor impeller for deposits
of foreign material.
3. Inspect the blower motor for deposits of foreign
material.
2004 Hummer H2
2004 HVAC Heating, Ventilation and Air Conditioning - Hummer H2
NOISE DIAGNOSIS - AIR CONDITIONING (A/C) SYSTEM
Noise Diagnosis - Air Conditioning (A/C) System
Did you find any foreign material on the blower
motor or blower motor impeller?
Go to
Step 8
Go to Step 7
7
Inspect the blower motor for the following conditions:
z
Cracked blades
z
A loose impeller retainer
z
Improper impeller alignment
Did you find any of these conditions?
Go to
Step 11
Go to Step 10
8
Remove the foreign material.
Is the action complete?
Go to
Step 10
-
9
Replace the blower motor. Refer to Blower Motor
Replacement .
Is the repair complete?
Go to
Step 12
-
10
Install the blower motor. Refer to Blower Motor
Replacement .
Is the action complete?
Go to
Step 12
-
11
Replace the blower motor impeller. Refer to Blower
Motor Impeller Replacement .
Is the action complete?
Go to
Step 12
-
12
Operate the system in order to verify the repair.
Did you find and correct the condition?
System
OK
Go to Step 2
Step
Action
Yes
No
DEFINITION: Noise originating from the A/C compressor, drive belt, or the A/C lines.
1
Were you sent here from Symptoms or another diagnostic
table?
Go to
Step 2
Go to Symptoms -
HVAC Systems -
Automatic in HVAC
Systems - Automatic
2
1. A/C system noises can be generally categorized into 3
areas:
z
Screeching, squealing, chirping noises
z
Moaning noises
z
Vibration/rattle noises
2. Start the engine.
3. Ensure that the A/C is ON.
Is a screeching, squealing noise heard when the A/C is
engaged?
Go to
Step 3
Go to Step 9
2004 Hummer H2
2004 HVAC Heating, Ventilation and Air Conditioning - Hummer H2
3
With the engine OFF, inspect the drive belt for excessive
wear. Refer to Drive Belt Excessive Wear Diagnosis in
Engine Mechanical - 6.0L.
Is the drive belt excessively worn?
Go to
Step 18
Go to Step 4
4
Inspect the drive belt tension. Refer to Drive Belt Tensioner
Diagnosis in Engine Mechanical - 6.0L.
Is the drive belt tension correct?
Go to
Step 5
Go to Step 19
5
Inspect the drive belt for excessive oil coverage.
Is the drive belt covered with oil?
Go to
Step 17
Go to Step 6
6
1. Start the engine.
2. Ensure that the A/C is ON.
3. Inspect the compressor and the clutch.
Is the A/C compressor locked up?
Go to
Step 24
Go to Step 7
7
Is the A/C compressor clutch slipping?
Go to
Step 23
Go to Step 8
8
Using a stethoscope, listen to the A/C compressor for any
abnormal noises.Is the compressor causing an abnormal noise?
CAUTION:
Refer to Moving Parts and Hot Surfaces Caution in
Cautions and Notices.
Go to
Step 15
Go to Step 10
9
Does a moaning noise exist when the A/C clutch is engaged?
Go to
Step 10
Go to Step 12
10
Listen to the A/C compressor components and mounting for
noise concerns using a stethoscope.
Are any of these components loose, damaged or excessively
worn?
Go to
Step 20
Go to Step 11
11
1. Idle the engine.
2. Engage the A/C compressor clutch.
3. Using a stethoscope, move around the entire refrigerant
plumbing system. Listening for any abnormal noises
caused by a component of the A/C system touching
another component.
Are any of the A/C components grounding out and causing a
vibration noise?
Go to
Step 22
Go to Step 13
12
Does a vibration or rattle noise exist when the A/C clutch is
engaged?
Go to
Step 13
Go to Step 14
13
Does the noise stop when the A/C clutch is disengaged?
Go to
Step 15
Go to Step 25
1. Idle the engine in PARK with the A/C compressor
clutch engaged.
2004 Hummer H2
2004 HVAC Heating, Ventilation and Air Conditioning - Hummer H2
NOISE DIAGNOSIS - HVAC MODULE
Noise Diagnosis - HVAC Module
14
2. Using a stethoscope, move around the entire A/C
system testing for any abnormal noises caused by a
component.
Do any of the A/C components cause an abnormal noise?
Go to
Step 21
Go to Step 25
15
Verify that the A/C system is properly charged. Refer to
Refrigerant System Capacities .
Is the A/C system properly charged?
Go to
Step 26
Go to Step 16
16
Recharge the A/C system to specification. Refer to
Refrigerant Recovery and Recharging .
Is the abnormal compressor noise still present?
Go to
Step 24
Go to Step 26
17
Repair the oil leak. Refer to Oil Leak Diagnosis in Engine
Mechanical - 6.0L.
Is the repair complete?
Go to
Step 26
-
18
Replace the A/C drive belt. Refer to Drive Belt Replacement
- Air Conditioning in Engine Mechanical - 6.0L.
Is the repair complete?
Go to
Step 26
-
19
Replace the A/C drive belt tensioner. Refer to Drive Belt
Tensioner Replacement - Air Conditioning in Engine
Mechanical - 6.0L.
Is the repair complete?
Go to
Step 26
-
20
Repair or replace the A/C compressor mounting component.
Is the repair complete?
Go to
Step 26
-
21
Repair or replace the component which is causing the
moaning concern as needed.
Is the repair complete?
Go to
Step 26
-
22
Correctly route or insulate the A/C component.
Is the repair complete?
Go to
Step 26
-
23
Replace the A/C compressor clutch. Refer to Compressor
Clutch Plate/Hub Assembly Replacement .
Is the repair complete?
Go to
Step 26
-
24
Replace the A/C compressor. Refer to Compressor
Replacement .
Is the repair complete?
Go to
Step 26
-
25
The concern may be caused by an engine related component.
Refer to Vibration Analysis - Engine in Vibration Diagnosis
and Correction.
Did you find and correct the condition?
Go to
Step 26
-
26
Operate the system in order to verify the repair.
Did you find and correct the condition?
System
OK
Go to Step 2
2004 Hummer H2
2004 HVAC Heating, Ventilation and Air Conditioning - Hummer H2
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