A/C - Difficult Temperature Regulation/DTC B2295/B2495
SERVICE INFORMATIONBulletin Nbr: 871-2322
Date: March 2002
Market: all
Not possible to regulate temperature on either left or right-hand side in front
Cars affected
All 9-5 M98-
Background
It is not possible to regulate the temperature on either the left or the right-hand side in front. DTC B2295 may be present if the right-hand shaft is broken, and B2495 if the left-hand shaft is broken.
Symptom description
Difficult to regulate the temperature.
DTC B2295
DTC B2495
Parts required
Parts required for removed heating and ventilation unit. (Parts required for removing/fitting heating and ventilation unit not included.)
53 35 823 service kit, heat exchanger housing, RHD
53 35 831 (CA: 30591598) service kit, heat exchanger housing, LHD
79 71 864 (CA: 30509025) cable tie (2x)
Procedure
1. Select the VENT air distribution setting.
2. Remove the heating and ventilation unit from the car, as described in WIS 9-5 M02 - 8. Body - Heating and ventilation, A/C - Adjustment/Replacement - Climate control unit.
3. Remove the foam seal from around the fan unit.
4. Remove the fan housing by removing the 4 screws and 2 clips.
5. Remove the plate that holds the connectors from the right-hand side. Unplug the temperature sensor connector, the lead of which enters the heating and ventilation unit via a rubber grommet on the plate.
6. LHD:
Remove the fan control module on the left-hand side by removing the 3 screws (4 screws on models with a transparent water barrier in front of the fan control module).
RHD:
Remove the fan control module on the right-hand side by removing the 3 screws (4 screws on models with a transparent water barrier in front of the fan control module).
7. Lift aside the fan unit.
8. Observe and mark which connector is connected to each stepping motor, as well as on which side the two temperature sensors are mounted. These must not be mixed up on reassembly.
9. Unplug the wiring harness and cut the cable ties. Remove the wiring harness.
Note
Exercise care so as not to break the catches that hold the temperature sensors in place.
10. The rear air distribution valve must be removed before removing the air distribution housing. Remove the 3 screws securing the cover and remove the cover.
11. Carefully open the clasp securing the control rod to the rear air distribution valve.
12. Undo the screws from the air distribution housing.
13. Remove the control rod.
14. Carefully lift aside the air distribution housing.
Note
Take care to prevent the control rod from catching and damaging anything.
15. Detach the pipes from the heat exchanger by removing the bracket.
16. Undo the screws from the heat exchanger housing.
17. Remove the clips on the side of the heat exchanger housing.
18. Remove the heat exchanger housing by opening the 3 plastic catches. Lift away the heat exchanger housing from the evaporator casing. Clean the bottom of the evaporator casing and the drain hole.
19. Remove the collar from the air outlet.
20. Remove the 2 screws securing the cover over the heat exchanger, and the 2 remaining screws securing the heat exchanger. Carefully withdraw the heat exchanger.
To fit
1. Fit the new heat exchanger housing to the evaporator casing. Tighten the screws and fit the 4 clips. Make sure the air shield on the heat exchanger housing bears against the seal and the guide in the evaporator casing.
2. Fit the heat exchanger housing by carefully inserting the heat exchanger into the heat exchanger housing and tightening the 2 upper screws. Fit the cover over the heat exchanger and tighten the 2 lower screws.
Tightening torque 1.4 Nm (1 lbf ft)
3. Fit the collar to the air outlet.
4. Fit new 0-rings, greased with acid-free vaseline, to the heat exchanger pipes. Take care not to damage the 0-rings.
5. Fit the pipes to the heat exchanger using the screw on the bracket. Take care not to damage the 0-rings.
Tightening torque 3.5 Nm (2.6 lbf ft)
6. Position the air distribution housing. Carefully pass through the control rod to the rear air distribution valve. Tighten the screws.
Tightening torque 1.4 Nm (1 lbf ft)
7. If necessary, raise the stepping motor linkage in the air distribution housing so that the two centre air outlets on the top side open fully.
8. Transfer the linkage gear for the rear air distribution valve from the old to the new heat exchanger housing. Make sure the markings on the gears are aligned, then turn the linkage gear to the stop. Insert the control rod and lock the clip.
9. Fit the cover by the rear air distribution valve.
Tightening torque 1.4 Nm (1 lbf ft)
10. Position the fan housing. Tighten the screws securing the ventilation fan housing and fit the 2 clips.
Tightening torque 1.4 Nm (1 lbf ft)
11. Fit the fan control module and route the wiring up under the clip. Where applicable, fit the water barrier.
12. Fit the temperature sensor connector to the plate and fit the plate to the heat exchanger housing. Make sure to guide the rubber grommet into the plate.
Tightening torque 1.4 Nm (1 lbf ft)
13. Fit a new foam seal around the fan housing.
14. Fit and plug in the wiring harness. Carefully make holes with the temperature sensors and position them. Secure the wiring harness with cable ties.
15. Fit the heating and ventilation unit, as described in WIS 9-5 M02 - 8. Body - Heating and ventilation, A/C - Adjustment/Replacement - Climate control unit.
Time/Warranty information
To resolve a customer complaint for a vehicle under warranty, submit a claim using the following information:
Failed Object: 85440
Fault/Reason code: 31
Location code: 09 (US=9)
Warranty Type (US): 01
Repair/Action code: 01
Labour operation (US): 8544002 9.2 hours + 1281601 1.3 hours
(CA: D2109 - 9.2 hours excl. draining and filling A/C)
Time: 9.2 hours + draining and filling A/C 1.3 hours