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TSB 91-15-05 A/C Odor
Publication Date: JULY 24, 1991

FORD: 1980-91 CROWN VICTORIA
1981-91 ESCORT
1982-83 FAIRMONT
1982-88 EXP
1982-91 MUSTANG, THUNDERBIRD
1983-86 LTD
1984-91 TEMPO
1986-91 TAURUS
1989-91 PROBE
LINCOLN-MERCURY: 1980-91 GRAND MARQUIS, MARK VII, TOWN CAR
1981-87 LYNX
1982-83 LN7, ZEPHYR
1982-86 CAPRI
1982-91 CONTINENTAL, COUGAR
1983-86 MARQUIS
1984-91 TOPAZ
1986-91 SABLE
LIGHT TRUCK: 1980-91 BRONCO, F-150-350 SERIES
1982-91 RANGER
1983-90 BRONCO II
1986-91 AEROSTAR
1988-91 ECONOLINE, F SUPER DUTY, F-47
1991 EXPLORER

This TSB article is being republished in its entirety to include Labor Standards for the Taurus, Sable and Probe vehicle models.

ISSUE: A "refrigerator type smell" or "chemical type" odor may come from some A/C systems. As the calibration of the clutch cycling pressure switch drifts downward, the evaporator core temperature may drop too low. This results in a "refrigerator type smell" or "chemical type" odor as the system cycles on and off.

ACTION: Install a new recalibrated clutch cycling pressure switch or adjust the existing/non-recalibrated clutch cycling pressure switch. The recalibrated switch can be identified by a specific supplier date code stamped near the fitting end of the switch.
Recalibrated switches built in the 1990 calendar year begin with the supplier date code 9041 and run through 9052 (last 2 digits of the calendar year followed by 2-digit week).
Recalibrated switches built in the 1991 calendar year start with the supplier date code 9101 and run through 9152.

ADJUSTMENT PROCEDURE
Adjust the existing/non-recalibrated A/C cycling pressure switch by using the following service procedure.

1. Disconnect the body wiring harness.
2. Turn the set screw located between the two electrical terminals 3/4 turn clockwise (looking into the electrical connection).
3. Reconnect the body wiring harness.

PART NUMBER PART NAME
E35Y-19E561-A A/C Cycling Pressure Switch

OTHER APPLICABLE ARTICLES: NONE
SUPERSEDES: 91-11-08
WARRANTY STATUS: Eligible Under Basic Warranty Coverage

OPERATION DESCRIPTION TIME
911505A Install A/C Cycling Pressure Switch - Town Car, Escort, Lynx, EXP And LN7. 0.3 Hr.
911505B Install A/C Cycling Pressure Switch - Tempo/ Topaz, Taurus/Sable, Probe. 0.4 Hr.
911505C Install A/C Cycling Pressure Switch - Crown Victoria, Grand Marquis, Mark VII Continental, Thunderbird, Cougar, Fairmont, Zephyr, Mustang, Capri, LTD And Marquis 0.5 Hr.
911505D Install A/C Cycling Pressure Switch - All Light Trucks. 0.4 Hr.
911505E Adjust A/C Cycling Switch - All 0.2 Hr.

For other TSBs, check here.

'80-96 F-series & Broncos w/R-134a take 11oz of PAG-46.

See also:
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