CLK 550 Cabriolet (209.472) V8-5.5L (273.967) (2007)
Cabin Temperature Sensor / Switch: Customer Interest
A/C - Blows Warm/Hot Air With A/C ON
CLIMATE SYSTEM BLOWING WARM/HOT AIR ONLY
Topic Number
LI83.00-P-046910
Version
2
Design Group
83.00 General
Date
07-22-2009
Validity
Model
209.356/365/372/375/376/377/456/465/472/475/476/477
Reason for change
Additional information on built range added/Supercedes DTB P-B-83.00/130
reason for block
Complaint:
Malfunctioning temperature sensor in the Overhead Control Panel (OPC)
Additional info for convertibles: If the customer states that the AC system functions properly with the roof open, but blows warm air only when the roof
is closed, this could be another indicator of a malfunctioning temperature sensor in the OPC.
Remedy:
Prerequisites:
^ If for a convertible model, convertible roof is closed.
^ Windows are open
^ Engine 2000 rpm
1. Place temperature dial on "max. Cool". The AC system should deliver cold air out of the air ducts. If no cold air is delivered by the system, check AC
components and repair as necessary. If the system is providing cold air, proceed to step 2.
2. Set temperature to 66°F on both the driver and passenger side and blower speed on 50%. If the temperature sensor in the OPC is delivering a wrong
reading to push button unit, the system will now blow warm air instead of the desired 66°F.
3. Using SDS follow menu path: "Control Units" -> "Air Conditioning" -> "C-AAC" -> "Actual values" -> "Other actual values"
Note:
209 models built between 06/2002 and 05/2005 do not have a temperature sensor in the OCP. Instead of showing no value at all, SDS will display the
temperature value measured by the push button unit in the actual value field of the OCP. (N70b1 = N22/7b1). As of SDS version 09/2009.
4. Compare actual values of in-car temperature sensor N70b1 and N22/7b1 (Figure 1 and 2).
5. If the actual value of the temperature sensor in the OCP shows far less (at least 20°F less) then the actual ambient temperature, the sensor is
malfunctioning and the OCP has to be replaced. Refer to EPCNet for the applicable part number.
Note:
Car interior may appear different from the pictures shown below.