A/C - Reduced Cooling After A Long Drive
Date: May 25, 2007Order No.: P-B-83.00/102
Supersedes:
Group: 83
SUBJECT:
Model 211.026/056/070/083/087/256/283/287
Equipped with Code 580 Two Zone Climate System Option (ACC)
From VIN A845370 to B100720 and X189946 to X223159
Reduced Air Flow / Cooling from Climate System After Long Drives
If you receive customer reports in the above model vehicles of reduced air flow and cooling after driving for an extended period of time, the cause may be that the evaporator has become frozen. Under certain temperature, humidity and driving conditions evaporator temperature control may not be optimized since the deletion of the humidity sensor starting with 7/2005 production. This condition may also be caused by a low refrigerant level. Follow the procedure below to diagnose and resolve.
1. Verify that the vehicle does not have a humidity sensor installed by removing the climate system air intake filter housing. A blank plug should be visible on the right side of the air intake (Figure 1).
2. Remove the blank plug by twisting it approximately a quarter turn and releasing it from the housing. Release the harness connector from the blank plug.
3. Plug the harness connector into the humidity sensor (A211 830 05 72) and install sensor into housing. Install climate system air intake filter housing.
4. Using SDS change the version coding: Workshop coding -> B31/2 (Air humidity sensor) Change from Not Present to Present.
5. A system slightly undercharged can cause the evaporator temperature to get too low and contribute to this condition. Verify that the air conditioning system is fully charged by evacuating and re-filling the system to the correct level. Refer to WIS document AR83.30-P-5251P.
Note:
Evacuating and filling the system for this condition does not require replacement of the fluid reservoir because the refrigerant system is not opened.
Parts Information
Note:
The following allowable labor operations should be used when submitting a warranty claim for this repair. This information has been generated on May 25, 2007. Please refer to Netstar -> Star TekInfo -> Star Time for the most current labor time allowance.
In Case of Warranty, use the table.