Hummer H3. Manual — part 1261

REPAIR INSTRUCTIONS

ODOR CORRECTION

Eliminating Air Conditioning Odor

9

Inspect the cooling system for leaks.
Refer to Cooling System Leak
Testing .
Is a leak present?

Go to Step 10

Go to Step 12

10

Inspect for coolant leaking inside the
vehicle or for a film build-up on the
windshield.
Is the condition present?

Go to Step 11

Go to Step 15

11

Replace the heater core. Refer to Heater
Core Replacement (Left Hand Drive)
or Heater Core Replacement (Right
Hand Drive).
Is the repair complete?

Go to Step 15

-

12

Does the odor have an oily smell?

Go to Step 13

Go to Step 15

13

1. Inspect the engine compartment for

any leaks. Refer to the following
procedures:

Oil Leak Diagnosis

Fluid Leak Diagnosis

Power Steering Fluid Leaks

2. Repair any oil leaks.

Is the repair complete?

Go to Step 15

-

14

A musty odor can be caused by mold or
mildew build-up on the evaporator or the
heater core or inside of the HVAC
module. Refer to Odor Correction.
Is the action complete?

Go to Step 15

-

15

Operate the system in order to verify the
repair.
Did you find and correct the condition?

System OK

Go to Step 2

2007 Hummer H3

2007 HVAC Heating, Ventilation and Air Conditioning - H3

Odors may be emitted from the air conditioning system primarily at start up in hot, humid
climates. The following conditions may cause the odor:

Debris is present in the HVAC module.

Microbial growth on the evaporator core

When the blower motor fan is turned on, the microbial growth may release an unpleasant musty
odor into the passenger compartment. To remove odors of this type, the microbial growth must be
eliminated. Perform the following procedure:

Deodorize the evaporator core using Deodorizing Aerosol Kit.

Perform the following steps in order to deodorize the A/C system:

1. Ensure that the plenum which draws outside air into the HVAC module is clear of debris.

2. Disable the A/C compressor clutch operation by disconnecting the clutch coil electrical

connector.

3. Dry the evaporator core by performing the following steps:

1. Start the engine.

2. Select the warmest temperature setting.

3. Select the recirculation mode.

4. Run the blower motor on high for 10 minutes.

4. Locate an area in the air conditioning duct between the blower motor and the evaporator

core downstream of the blower motor.

5. Drill a 3.175 mm (0.125 in) hole where the hole will not interfere with or damage the

following components:

The blower motor

The evaporator core

Any other operating part the of system

6. Wear safety goggles and latex gloves in order to perform the following actions:

1. Select the maximum blower speed.

2. Insert the deodorizer extension tube into the hole to the mark on the extension tube.

3. Use short spray bursts and vary the direction of spray for a 2-3 minute period of time.

7. Shut the engine OFF. Allow the vehicle to sit for 3-5 minutes.

8. Seal the 3.175 mm (0.125 in) hole with body sealer or RTV gasket compound.

9. Start the engine.

2007 Hummer H3

2007 HVAC Heating, Ventilation and Air Conditioning - H3

10. Operate the blower motor on high for 15-20 minutes to dry.

11. Reconnect the A/C compressor clutch coil electrical connector.

12. Verify proper clutch operation.

REFRIGERANT RECOVERY AND RECHARGING

Tools Required

J 43600 ACR 2000 Air Conditioning Service Center. See Special Tools.

J 45037 A/C Oil Injector. See Special Tools.

CAUTION: Avoid breathing the A/C Refrigerant 134a (R-134a) and the

lubricant vapor or the mist. Exposure may irritate the eyes,
nose and throat. Work in a well ventilated area. In order to
remove R-134a from the A/C system, use service equipment
that is certified to meet the requirements of SAE J 2210 (R-
134a recycling equipment). If an accidental system discharge
occurs, ventilate the work area before continuing service.
Additional health and safety information may be obtained
from the refrigerant and lubricant manufacturers.

CAUTION: For personal protection, goggles and gloves should be worn

and a clean cloth wrapped around fittings, valves and
connections when doing work that includes opening the
refrigerant system. If R-134a comes in contact with any part of
the body severe frostbite and personal injury can result. The
exposed area should be flushed immediately with cold water
and prompt medical help should be obtained.

NOTE:

R-134a is the only approved refrigerant for use in this vehicle. The
use of any other refrigerant may result in poor system performance
or component failure.

NOTE:

To avoid system damage use only R-134a dedicated tools when
servicing the A/C system.

NOTE:

Use only Polyalkylene Glycol Synthetic Refrigerant Oil (PAG) for
internal circulation through the R-134a A/C system and only 525

2007 Hummer H3

2007 HVAC Heating, Ventilation and Air Conditioning - H3

The J 43600 is a complete air conditioning service center for R-134a. See Special Tools. The
ACR 2000 recovers, recycles, evacuates and recharges A/C refrigerant quickly, accurately and
automatically. The unit has a display screen that contains the function controls and displays
prompts that will lead the technician through the recover, recycle, evacuate and recharge
operations. R-134a is recovered into and charged out of an internal storage vessel. The ACR
2000 automatically replenishes this vessel from an external source tank in order to maintain a
constant 5.45-6.82 kg (12-15 lbs) of A/C refrigerant.

The ACR 2000 has a built in A/C refrigerant identifier that will test for contamination, prior to
recovery and will notify the technician if there are foreign gases present in the A/C system. If
foreign gases are present, the ACR 2000 will not recover the refrigerant from the A/C system.

The ACR 2000 also features automatic air purge, single pass recycling and an automatic oil drain.

Refer to the J 43600 ACR 2000 manual for operation and setup instruction. See Special Tools.
Always recharge the A/C System with the proper amount of R-134a. Refer to Refrigerant
System Capacities for the correct amount.

A/C Refrigerant System Oil Charge Replenishing

If oil was removed from the A/C system during the recovery process or due to component
replacement, the oil must be replenished. Oil can be injected into a charged system using J
45037 . See Special Tools. For the proper quantities of oil to add to the A/C refrigerant system,
refer to Refrigerant System Capacities.

FLUSHING

Tools Required

J 43600 Air Conditioning Service Center. See Special Tools.

viscosity mineral oil on fitting threads and O-rings. If lubricants
other than those specified are used, compressor failure and/or
fitting seizure may result.

NOTE:

R-12 refrigerant and R-134a refrigerant must never be mixed, even
in the smallest of amounts, as they are incompatible with each
other. If the refrigerants are mixed, compressor failure is likely to
occur. Refer to the manufacturer instructions included with the
service equipment before servicing.

2007 Hummer H3

2007 HVAC Heating, Ventilation and Air Conditioning - H3