C180K climate control problem - Mercedes-Benz Forum
 
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post #1 of 4 (permalink) Old 09-15-2017, 12:40 AM Thread Starter
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Vehicle: 1992 W140
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C180K climate control problem

Hi, I've just bought another Benz, this time a W203 2003 C180K. The car is perfect except for one minor problem. The switch does not seem to direct air to the bottom vents, particularly when heating. Cooling seems to work a bit better, but not perfectly. Sometimes it will work on Auto mode (correctly directs the air), other times not. In heating mode the air that does come out is kind of lukewarm at best, although it does eventually heat up the car.

Three questions:

1. I've read mention of some error codes that can indicate where there are issues in the climate control system. Are these just OBDII codes? I've got a generic ODBII reader lying around somewhere that I bought for an Audi A4, would this reader work on the C180? Or do I need to go to the dealership to pull the codes?
2. I've also read mention that the climate control unit can show diagnostic information by holding down the REST button. Would any of this information be useful in pinpointing the problem?
3. What is the most likely cause of this, from your experiences?

Step by step would be good, I'm totally unfamiliar with this car, though I'm willing to give it a go to fix it myself if there's an easy enough way to do it.

Thanks
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post #2 of 4 (permalink) Old 09-15-2017, 12:49 AM
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Are you switching off the A/C compressor when heating by pressing the AC off button to illuminate the small red light?
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post #3 of 4 (permalink) Old 09-15-2017, 12:59 AM Thread Starter
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Originally Posted by Benzyle View Post
Are you switching off the A/C compressor when heating by pressing the AC off button to illuminate the small red light?
I...hadn't tried that. You need to do that? I'd assumed by turning up the heat setting it would just switch over...off to try it!

Edit: doesn't appear to have made much difference to the air-flow. I won't be able to road-test however until tomorrow morning.

An awful lot of air sounds like it's still being directed to the top vent (the large one under the windscreen). Is this normal for these cars?
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post #4 of 4 (permalink) Old 09-15-2017, 02:37 AM
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I don't have my C180K any more,but from what I recall I think your problem may be normal,but I cannot rule out a fault. It is normal to have air coming out the large top vent when you don't really want it to.
I would recommend that when too much air comes out the top vent use the scroll dial on the vent to shut it down,and do the same for the side vents and centre vents.
Obviously put the main setting to feet position,and put the temp up high,like 27 degrees.
If you leave it on auto the AC will run all the time,so I suggest switch it off by pressing the AC button whenever you don't want cooling,this is the economy mode,this will save some fuel as well. Remember,if the little red or orange light is on,then the AC is off. If the AC has been running for a while and you switch it off,it will continue to put out cool air for about another ten minutes.

The other thing of course is that your car engine needs to be up to temp before you will get really hot air coming out. It should take no more than five minutes for your engine temp to get up to normal 85 degrees . If not,you have a thermostat problem.
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