For 1990-2009 cars

# ODOR FROM A/C OUTLETS REPAIR PROCEDURE

#### VEHICLES AFFECTED: 1985-87 C SERIES 1986-87 E,H, AND K SERIES AND 1987 V SERIES

Some 1985-1987 C Series , 1986-1987 E, H and K Series, and 1987 V Series may experience odours emitted from the air conditioning system during various operating conditions. Odour may be the result of debris in the heater/evaporator case or mold/bacteria growth on the evaporator core. To correct this condition, the following procedure should be utilized.

1. Remove power module as described in Service Manual.

#### CAUTION:

POWER MODULE HEAT SINK MAY BE HOT.

2. Check heater/evaporator case for debris. Remove any debris present through power module opening.

3. Use Kent-Moore tool J-36645 or an equivalent siphon-type parts cleaning spray gun capable of delivering two ounces/minute of liquid when driven with shop air at 80-90 PSI. Insert the nozzle of the spray gun through the power module opening, and insert the siphon hose into container of disinfectant* such as Clorox or equivalent.

#### CAUTION:

WEAR SAFETY GOGGLES. DO NOT GET DISINFECTANT IN EYES OR ON CLOTHING. DISINFECTANT IS HARMFUL IF SWALLOWED AND MAY IRRITATE SKIN.

Direct spray toward evaporator face to ensure adequate coverage of the corners and edges, completely saturating the entire core. Use one quart of disinfectant.

4. Check underneath vehicle to verify proper evaporator drain operation. If necessary, unclog and increase drain plug slits with a razor blade or sharp knife.

5. Allow the core to soak for approximately five minutes.

6. Thoroughy rinse the evaporator core with one quart of clean water using any disinfectant residue.

7. Reinstall the power module.

#### CAUTION:

POWER MODULE HEAT SINK MAY BE HOT.

* - In September, 1987 an air conditioning system disinfectant will be available through GM Parts for use with this cleaning procedure.

General Motors bulletins are intended for use by professional technicians, not a "do-it-yourselfer". They are written to inform those technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions and know-how to do a job properly and safely. If a condition is described, do not assume that the bulletin applies to your vehicle, or that your vehicle will have that condition. See a General Motors dealer servicing your brand of General Motors vehicle for information on whether your vehicle may benefit from the information.