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Page Hits: 1965199
US BULLETIN No: 07-001/03 DATE: 2003
CAN BULLETIN No: N/A
APPLIES TO: 1998-2003 MPV AFFECTED VINs: All
SUBJECT: Air Conditioning - Musty/mildew odor
BULLETIN NOTES: This bulletin supersedes 07-004/02, issued 8/30/02. The 2003 Model Year has been added and Tribute has been removed.
DETAILS:

NOTE: This bulletin applies to 1998-2002 626, 1998-2003 Protege, 2002-2003 Protege5, 2000-2003 MPV, 1998 MPV, 1998-2002 Millenia, 1999-2003 Miata

A musty/mildew type odor may come from the vents when the air conditioning (A/C) system is operating. It is most noticeable when the A/C is first turned ON. This odor is the result of mold growth in the A/C evaporator/cooling unit which is caused by condensation, dust, and pollen within the cooling unit. This condition is usually worse during high humidity conditions. "Mazda Air Cooling Coil Coating" is available to encapsulate the mold to reduce odors. If the product is properly applied, it can effectively reduce the musty/mildew odor for up to three years.

NOTE: See parts information for Mazda Air Cooling Coil Coating and Kit part numbers.

This treatment provides a durable coating that will aid to prevent biological reactions that lead to odor concerns. It is applied to the evaporator in a misted form that is introduced by way of the re-circulate door, the blower motor resistor access, or the blower motor air intake (on rear a/c only). Proper application requires the evaporator.

  • Surface to be relatively clean and free of leaves, dust build-up and debris.
  • To be thoroughly dried, and the product cured onto it after application.

NOTE:

  • A/C odor is not unique to Mazda vehicles as it will occur in other makes and models.
  • To minimize A/C odor, inform customers of the following suggestions:
    • Keep the cooling unit dry by leaving the blower fan ON (at least on low), even if the A/C is not being used.
    • In low humidity (dry) conditions, keep the ventilation system in the "FRESH" mode all the time, or as much as possible.
    • In high humidity conditions, or if the air has a lot of dust or pollen, keep the system in the "RECIRCULATION" mode.
    • A few minutes before reaching a destination, turn the A/C OFF, but leave the blower fan ON. This stops the accumulation of condensation on the evaporator/cooling unit, and it helps dry the inside of the cooling unit.

Customers having this concern should have their vehicle repaired using the following procedure.

REPAIR PROCEDURE

  1. Verify customer concern.
  2. Verify that evaporator drain has no blockage.
  3. Apply "Mazda Air Cooling Coil Coating" according to the attached instructions. Refer to the table below for the applicable repair instructions.
    Repair ProcedurePage(s)
    1998-2002 6264-5
    1998-2002 Protege & Protege56-7
    2000-2002 MPV Front A/C8-9
    2000-2002 MPV Rear A/C10
    1998 MPV Front A/C11-12
    1998 MPV Rear A/C13
    2001-2002 Millenia14-16
    1998-2000 Millenia17-18
    1999-2002 Miata19-20
    2001-2002 Tribute21-22
    NOTE:
    • Follow attached instructions completely to ensure an effective repair. If insufficient care is taken on the drying sequence of product, the coating will not last, and the concern will reoccur.
    • If odor is still present after treatment, it may be necessary to remove and clean evaporator, evaporator foam, and inside of cooling unit housing with a mild dish soap and water solution. To avoid damage to components, do not clean with bleach. See Workshop Manual section 07 for removal instructions.

    WARNING:

    • When using this product, avoid skin and eye contact. Wear safety glasses and gloves, and avoid breathing vapors.
    • Read all the safety and first aid instructions on the back of the Mazda bottle.
  4. Verify repair.

PARTS INFORMATION

Part Number Description Qty. Notes
0000-77-570K-01  Mazda Air Cooling Coil Coating Kit  Includes applicator, pressure regulator, and 4- bottles of Mazda Air Cooling Coil Coating 118 ml (4 fl oz)  
0000-77-550E-01  Mazda Air Cooling Coil Coating  Qty 1 = 4 bottles. Replacement bottles 118 ml (4 fl oz), requires one-bottle per vehicle (two-bottles required for MPV with rear air) 

WARRANTY INFORMATION

This repair is not covered by warranty.

2000-2002 MPV

Front AC

  1. Dry evaporator using the following procedure:
    WARNING: Running the engine inside an enclosed area, such as a garage, is dangerous. Exhaust gas, which contains poisonous carbon monoxide, could easily enter the cabin. Loss of consciousness or even death could occur. Don't run the engine when inside an enclosed area.
    1. Start engine.
    2. Set HVAC controls as follows:
      • RECIRCULATE
      • FULL HEAT
      • FRONT A/C FAN HIGH
      • REAR A/C FAN HIGH
      • A/C OFF

    3. Open one window approximately 1/2 inch.
    4. Let engine run for 10 minutes.
  2. Remove glove box by:
    1. Pushing top stops inward.
    2. At right side hinge, lift clip out of its seat.
    3. Pull left axle pin out towards right side and remove glove box.
  3. Remove dust filter cover located over fan assembly by depressing clip on inner side of cover.
  4. Remove dust filter by pulling it out of filter housing. Discard filter if dirty.
  5. Shake bottle of Mazda Air Cooling Coil Coating well and attach it to applicator. Then connect applicator to compressed shop air.
  6. Insert the applicator into empty filter housing (approximately 4ΒΌ" from tip of applicator). Point nozzle tip downwards and towards the center (approximately 7 o'clock position).
  7. Spray entire contents of bottle in short bursts, 3 seconds ON, 3 seconds OFF into the rotating fan. A fine mist may exit from the ducts.
    NOTE: If vehicle is equipped with rear a/c, skip STEP 8. Proceed to STEP 9.
  8. When bottle is empty, stop engine and remove applicator. Let vehicle sit for 10 minutes.
    NOTE: For reuse, clean the applicator by flushing a bottle of clean water through it.
  9. Install previously cleaned or new filter as needed and reinstall the filter cover
  10. Reinstall glove box.

Rear AC (if equipped)

  1. Remove right side cup holder.
  2. Remove and disconnect rear fan control panel and convenience tray, if equipped.
  3. Be sure HVAC controls are set per STEP 1B (see page 8).
    NOTE: Rear fan will operate even though rear fan control panel is disconnected.
  4. Shake a new bottle of Mazda Air Cooling Coil Coating well and attach it to applicator. Then connect applicator to compressed shop air.
  5. Begin inserting applicator through opening of control panel/convenience tray front to back with tip pointed up (for space). While inserting probe, rotate the tip outward toward fan air intake opening. When inserted (depth of insertion is approximately half length of applicator), point tip side center into cage without touching it.
  6. Spray entire contents of bottle in short bursts, 3 seconds ON, 3 seconds OFF into rotating fan. A fine mist may exit from the ducts.
  7. When bottle is empty, stop engine and remove applicator. Let vehicle sit for 10 minutes.
    NOTE: For reuse, clean the applicator by flushing a bottle of clean water through it.
  8. Use STEP 1 to dry and cure product.
  9. While the product is drying, re-install removed parts.
  10. Note application date in service record.

1998 MPV

Front A/C

  1. Dry evaporator using the following procedure:
    WARNING: Running the engine inside an enclosed area, such as a garage, is dangerous. Exhaust gas, which contains poisonous carbon monoxide, could easily enter the cabin. Loss of consciousness or even death could occur. Don't run the engine when inside an enclosed area.
    1. Start engine.
    2. Set both front and rear (if applicable) HVAC controls as follows:
      • RECIRCULATE
      • FULL HEAT
      • FAN HIGH
      • A/C OFF
      • AIRFLOW (FACE & FLOOR)

    3. Open one window approximately 1/2 inch.
    4. Let engine run for 10 minutes to dry evaporator.
  2. Remove glove box, removing side fascia plate on right door side.
  3. Remove six (6) Phillips screws to remove glove box assembly.
  4. Shake well the bottle of Mazda Air Cooling Coil Coating and attach it to the applicator. Then connect applicator to compressed shop air.
  5. Insert applicator into the grille of re-circulate door. Point nozzle tip down and towards center of cooling unit (approximately 7 o'clock position).
  6. Spray entire contents of bottle in short bursts, 3 seconds ON, 3 seconds OFF into rotating fan. A fine mist may exit from ducts.
    NOTE: If vehicle is equipped with rear a/c, skip STEP 7. Proceed to STEP 8.
  7. When bottle is empty, stop engine and remove applicator. Let vehicle sit for 10 minutes.
    NOTE: For reuse, clean the applicator by flushing a bottle of clean water through it.

Rear A/C (if equipped)

  1. Remove the four (4) screws holding down tailgate sill. Remove sill.
  2. Remove one (1) screw holding down left inner panel. Lift complete panel out of clips.
  3. Be sure HVAC controls are set per STEP 1B (see page 11).
  4. Shake a new bottle of Mazda Air Cooling Coil Coating well and attach it to applicator. Then connect applicator to compressed shop air.
  5. Position applicator with nozzle tip pointing down into air intake of fan motor.
  6. Spray entire contents of bottle in short bursts, 3 seconds ON, 3 seconds OFF into rotating fan. A fine mist may exit from ducts.
  7. When bottle is empty, stop engine and remove. Let vehicle sit for 10 minutes.
    NOTE: For reuse, clean the applicator by flushing a bottle of clean water through it.
  8. Use STEP 1 to dry and cure product.
  9. While product is drying, re-install removed parts.
  10. Note application date in service record.
CONSUMER NOTICE:
The information and instructions in this bulletin are intended for use by skilled technicians. Mazda technicians utilize the proper tools/equipment and take training to correctly and safely maintain Mazda vehicles. These instructions should not be performed by "do-it-yourselfers." Consumers should not assume this bulletin applies to their vehicle or that their vehicle will develop the described concern. To determine if the information applies, consumers should contact their nearest authorized Mazda dealership.
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