HVAC System - Unpleasant Odors When In Use
BULLETIN NUMBER:SB99-12-S002
ISSUE DATE:
MARCH 1999
GROUP:
AIR CONDITIONING
AFFECTED VEHICLES
All Isuzu light vehicles equipped with air conditioning.
SERVICE INFORMATION
Condition:
Some Isuzu owners may experience unpleasant odors when using the ventilation system. These odors may be more pronounced after engaging the HVAC system, especially within 12 to 24 hours after previous use.
Possible Cause:
The above condition is typically caused by residual c6ndensation in the evaporator case after A/C use. The odor can be aggravated by particulates such as: cigarette/cigar smoke, airborne molds, pollen, algae and bacteria trapped in the HVAC system and continually recirculated.
Correction:
To minimize or eliminate unpleasant odors originating from the HVAC system, use available tool # J43681-A (Figure 1) to perform the procedure outlined in this bulletin.
SERVICE PROCEDURE
1. Set the temperature selector to the warmest setting and select A/C off.
2. Dry the A/C evaporator by running hot air over the core with the mode control knob on recirculation mode for approximately five (5) minutes.
* On some models (without the manual A/C ON/OFF button), select "MAX A/C" mode with A/C fuse removed to disable the A/C compressor.
3. Remove the glove box while drying the A/C evaporator.
4. Drill 5/16"(8 mm) hole in the upper-right corner of the evaporator case. (Figure 2)
CAUTION
Be certain to set the drill bit depth at no more than 1/4" (6 mm). Mark the drill bit 1/4"(6 mm) or less from its tip as a guide. Extending the drill bit deeper into the case after the hole has been drilled will risk puncturing the evaporator core.
5. With the blower fan on medium to high speed and using the outside air setting, dispense the deodorizer material J43681-A (w/applicator nozzle) with the following:
^ Place the tip of the nozzle into the 5/16"(8 mm) drilled hole of A/C evaporator core casing. (Figure 3)
^ Using no more than 30 PSI shop air, set nozzle fluid flow adjustment to full open position (full counterclockwise position), and flood the A/C evaporator core by discharging 4 fluid ounces of treatment chemical into the casing.
NOTE
2 fluid ounces are required to prime the application tubing and nozzle. The 1/2 gallon container label is graduated in 4 ounce increments.
6. Plug the 5/16" (8 mm) hole with a 5/16" (8 mm) plug supplied with each treatment kit.
7. Run the ventilation system 5-10 minutes with the fan on high and windows open.
8. Reinstall the glove box and any panels, previously removed during Step 2.
* Reinstall the A/C fuse, if previously removed.
The application should last 3-4 months under normal use. Repeat the above service procedure, should odors return after such time.
NOTE
As a preventive measure, service personnel may also suggest to the customer to run the fan blower at mid to high speed with the A/C off and using the outside air setting to dry the evaporator for the last few minutes before turning off the vehicle.
PARTS INFORMATION
KENT-MOORE Part Number Description Quantity
J43681-A HVAC SYSTEM 1 Kit*
Cleaner-Freshner-Protectant
with application nozzle
J43681-5 Replacement Chemical (Refill)
(2-1/2 gallon containers)
* A sufficient quantity of 5/16"(6 mm) plug is included with each treatment kit.
NOTE: This product will be available for purchase beginning mid-April 1999.
GREEN ISLAND INC. WARRANTY INFORMATION
Please refer to the warranty information included with each HVAC system treatment kit. Green Island Inc. warrants to the buyers that the products are free from defects with a 1 year Limited Warranty. For inquiries regarding warranty claim information for Green Island Inc. products contact their customer support at 1-800.718-1131.
ISUZU WARRANTY CLAIM INFORMATION
Isuzu warranty does not cover this service.