Sundance L4-153 2.5L SOHC Turbo (1990)
Vacuum Check Valve HVAC: All Technical Service Bulletins
A/C, Heater Check Valve - Freeze-Up
Models
1989 AA, AC, AG, AH, AJ, AK, AL, AN, AP, & AQ Bodies
Subject
Air Conditioning/ Heater Vacuum Control System Check Valve Freeze-Up
Index
HEATER AND AIR CONDITIONING
Date
November 13, 1989
No.
24-06-89
(C24-05-9)
P-4040
BODY CODE LEGEND
AA - SPIRIT/ACCLAIM AC - DYNASTY/NEW YORKER/LANDAU AG - DAYTONA AH - LANCER/LeBARON GTS (4-DOOR HATCHBACK)
AJ - LeBARON (2-DOOR COUPE/CONVERTIBLE) AK - ARIES/RELIANT AL - OMNI/HORIZON AN - DODGE DAKOTA/DAKOTA SPORT
(RWD, 4WD) AP - SHADOW/SUNDANCE AQ - CHRYSLER'S TC (MASERATI COUPE)
SYMPTOM CONDITION
During extreme cold ambient temperature (+ 10~F or less) conditions, a long delay (as much as 10 minutes) may occur when changing the air
conditioning/heater mode switch from defrost to any other mode.
PARTS REQUIRED
1
Vacuum Control System Check Valve
P/N 5264270
DIAGNOSIS
The delay in mode change from defrost to any other mode will most likely occur during ambient temperatures of + 10~F or less. The delay may be
caused by an air conditioning/heater vacuum control system check valve freeze-up condition.
REPAIR PROCEDURE
When a vehicle owner encounters the SYMPTOM/CONDITION described above, replace the vacuum control system check valve assembly with Part
Number 5264270, as listed under "PARTS REQUIRED." Refer to the following procedure.
