A/C - Evaporator Housing Water Leak
84saab03SUBJECT:
EVAPORATOR HOUSING WATER LEAKS, M79- 900 MODELS
ISSUE: 01/84-661
FILE IN S.I. MANUAL:
VOLUME: I
SECTION: 8
PAGE: 75
Water leakage onto the passenger side carpet may be traced to AC evaporator/ heater housing leakage. The following repair steps are to be taken to eliminate water leaks at this housing. Note: Be sure that water leakage is not an engine coolant leak from the heater valve before you begin repair.
Genuine evaporator housing leaks may be either water entering through the hood vent and/or condensation from the air conditioning evaporator unit.
When making seal repairs to the evaporator housing, use a non-silicone sealing agent such as Strip-Calk by 3M. This is a non-hardening sealer which will not lift away from the plastic housing. Silicone seal tends to lift or separate from the plastic after extended time periods and should not be used.
Repair details:
1. The evaporator housing seals at the firewall by means of a foam gasket. A leak here would be a result of water entering the hood vent.
Carefully press Strip-Calk into the joint made by the housing and the firewall.
Time to perform this is approximately 0.2 hour.
2. The evaporator must fit between the outer and inner gussets of the housing (see diagram). An evaporator that has been incorrectly fitted may spread the halves of the housing apart as the screws are tightened down. The centering of the evaporator can be checked by viewing through the air intake opening with the aid of a flashlight.
NOTE: The inner gusset has been done away with in M84 to lessen the possibility of this happening.
Time to perform this check is approximately 0.1 hour.
3. If leakage still exists after the evaporator location has been checked, the evaporator must be removed and the drain hose fitting and the two halves of the housing must be sealed with Strip-Calk.
NOTE: Pay particular attention to the fitting for the drain hose. Movement of this fitting during operation of the vehicle will allow water to leak by, thus it must be sealed well.
Time to perform this is approximately 2.2 hours. This includes Operation #91060 to R & R evaporator and 0.5 hour straight time to seal the housing.
Warranty Information:
Use Failure Code: 85414-05-4-XX-05. Time allowed is as included in the above three repairs. (Substitute correct type of coverage code for XX.)