A/C - Chemical Type Odor

Bulletin No.
012/92

Issued
7/14/92

Revised



Category
U



Applicable Model/s
1991 Navajo



Subject
AIR CONDITIONING "CHEMICAL TYPE" ODOR



DESCRIPTION

A "chemical type" odor may come from the Navajo A/C system during operation. This symptom is caused by an uncalibrated "A/C Cycling Pressure Switch" which will engage the A/C compressor more frequently than required. As the compressor cycles, the temperature in the evaporator drops below normal creating a "chemical type" odor.

INSPECTION & REPAIR PROCEDURE

If the above symptom is observed, a new recalibrated clutch cycling pressure switch may be installed, (see Workshop Manual, page U-03-36) or the existing non-recalibrated switch may be adjusted.





The recalibrated switch can be identified by a specific supplier date code stamped near the fitting end of the switch. Figure 1.

Note:
- Recalibrated switches built in the 1990 calender year begin with the supplier code 9041 and run through 9052.
- Recalibrated switches built in the 1991 calender year begin with the supplier code 9101 and run through 9152.

ADJUSTMENT PROCEDURE

To adjust the existing, non-recalibrated clutch cycling pressure switch, perform the following procedure.

1. Disconnect the body wiring harness.

2. Turn the set screw, located between the two electrical terminals, 3/4 (three-quarter) turn clockwise (looking into the electrical connection). Figure 1.

3. Reconnect the body wiring harness.



PARTS INFORMATION

PART NUMBER DESCRIPTION

ZZL0 61 512 A/C Cycling Pressure Switch


WARRANTY INFORMATION
(Applies to vehicles covered under warranty.)

Warranty Type Code:
A

Customer Comment Code:
84

Damage Code:
9H

Part No. of Main Cause:
ZZL0 61 512

Operation No.:
YY0053RX

Labor Hours:
0.2 Hr.