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Old 07-31-2002, 05:39 PM
rrf rrf is offline
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Join Date: Jun 2002
Posts: 15
W203 A/C problem

Hello A/C gurus

New 2002 W203 C-Class Sedan, but same scenario as Mr. Raygun17

AC = Hot air output when hot outside (80-90 degrees actual air temp), and idling/sitting.
AC = Works fine when in shade, running on freeway etc.
AC after running and then parking in the sun, takes forever to come back into cool air mode.

There is a A/C diagnostic mode one can enter into on the front of unit, all looks OK (to me) except the register for "Outside Air Temp", It reads in the 69-84 range when OK and gets into the 120-165 range when the AC is blowing hot air.

Do you think the Recirc Flap is likely? where is it actually located and how to easily test it?

FYI Excel spreadsheet of Diagnostic Mode, attached
Attached Files
File Type: zip c32 ac (2.9 KB, 141 views)
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Old 07-31-2002, 07:24 PM
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Join Date: Mar 2001
Location: NorCal
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The vehicle is under warranty. Why are you not just taking to the dealer??

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Old 07-31-2002, 08:16 PM
rrf rrf is offline
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Warranty: Yes

But I prefer to have a good idea before I take it in.
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Old 07-31-2002, 09:26 PM
it leaks, its german
Join Date: Mar 2002
Location: raleigh nc
Posts: 1,111
The 203's have eletric stepper motors on the flaps, blend dorrs and no monovalves on the heater cores.

The system uses inputs from the interior temp sensor, sun sensor, temp dial setting, evap temp sensors,heater core temp sensors and refridgerant pressure to establish the compressor "wobble plate" duty cycle.

Odds are you have either a bad evap temp sensor, pressure sensor or ambient sensor causing this. However I seem to remember something about the AAC control units on some models.

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Old 08-01-2002, 03:17 AM
rrf rrf is offline
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Join Date: Jun 2002
Posts: 15
Thx Joe

Did you look at the attached file for your diagnosis?
I think the data I attached might shed some light.

Agree control head unit is likely candidate, others have posted probs solved by new control unit, not the same symptoms though.
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