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#1
07-11-2003, 12:57 PM
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W202 air conditioner
W202 1998 C230: In very hot weather (>95 F), the a/c compressor cycles on and off at idle, and does not maintain cold air. This typically occurs when sitting in traffic.
The compressor, dryer bottle, a/c switch/sensor, and associated a/c rings have been replaced. Any suggestions? 
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#2
07-11-2003, 01:14 PM
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If your car has AUX cooling fans, I would check those. I would not recommend replacing any mechanical components before the electrical systems have been checked out.
In general, in a W124, AC compressor is usually turned on and off every 20 secs if the engine is overheating and to prevent AC components from freezing. There are numerous senors in the AC system which can also cause a problem, but the AUX fans seem like the most likely cause. Does the engine overheat while the car is stopped?
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Zafar 94 E320 58000 Miles
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#3
07-11-2003, 01:19 PM
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No, the engine does not overheat at all. The auxillary fan can be heard prominently (car sounds like a jet as it comes down the road). I cannot imagine that this is normal.
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1998 W210 E300TD 1997 W202 C230 1990 W124 300TE 1985 W123 280TE (sold) 1983 W123 300D (sold) 1981 W123 240D (sold) 1980 W116 280SE (sold) 1980 R129 450 SLC 5.0 (sold) 1975 W115 240D (sold)
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#4
07-11-2003, 01:23 PM
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This thread may help you diagnose the problem. On mine, this was caused by a faulty evaporator temp sensor.
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John 2003 Firemist Red/grey leather SL 500 2015 Palladium Silver/black mbtex GLK 350 1987 Smoke Silver/burgundy mbtex 300E Sportline (SOLD) Click to see 87 300E
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#5
07-11-2003, 01:28 PM
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Thank you for the thread. Great pics of C & E class!
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1998 W210 E300TD 1997 W202 C230 1990 W124 300TE 1985 W123 280TE (sold) 1983 W123 300D (sold) 1981 W123 240D (sold) 1980 W116 280SE (sold) 1980 R129 450 SLC 5.0 (sold) 1975 W115 240D (sold)
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#6
07-11-2003, 02:49 PM
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Yes - "short cycling" describes the problem. The refrigerant system was evacuated and recharged, but perhaps there is a leak. Is this possible? What would cause the leak? What would be the possible location(s) of such leak? Why would it only occur in very hot weather, when the engine is hot?
 Thank you for the information.
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1998 W210 E300TD 1997 W202 C230 1990 W124 300TE 1985 W123 280TE (sold) 1983 W123 300D (sold) 1981 W123 240D (sold) 1980 W116 280SE (sold) 1980 R129 450 SLC 5.0 (sold) 1975 W115 240D (sold)
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#7
07-11-2003, 03:52 PM
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What you describe is called "short cycling" and is an indication of a low refrigerant charge.
Hope this helps,
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