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ychung Veteran Date registered: Aug 2015 Location: SO CAL Vehicle(s): 2004 G500, 2014 ML350, 2008 S550 Posts: 196 | AC Fan Switch Issue Hi, hope everyone here is safe and healthy during this crazy times. My AC turns on time to time although I didn't turn it on, especially when I start the car. I just need to turn the fan switch on and turn it off, and AC stays off. Everything else works fine with AC. Do I just need to replace the fan switch or is there something else need to check? It looks like I need the whole control panel, part#209-830-0485 Please let me know what you all think. Thank you | ||
#241954 | |||
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gbenzer Extreme Veteran Date registered: Dec 2006 Location: Georgia Vehicle(s): 2007 G-500, 2017 Audi Q7 Posts: 418 | Re: AC Fan Switch Issue Seeing no other responses I'll jump in. There may be a bad switch; I don't know. Don't forget however that the AC will run on it's own down to about 40-50F ambient to dehumidify the cabin air to keep it fresh. That may be what is happening. | ||
#241959 - in reply to #241954 | |||
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ychung Veteran Date registered: Aug 2015 Location: SO CAL Vehicle(s): 2004 G500, 2014 ML350, 2008 S550 Posts: 196 | Re: AC Fan Switch Issue Thank you for your comment, since it's intermittent issue I will wait for now and look for a good used unit. | ||
#241960 - in reply to #241959 | |||
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Floobydust Veteran Date registered: Mar 2014 Location: Massachusetts, USA Vehicle(s): 1995 E320 Cabrio, 2003 G500, 2000 SL500, 1980 TR8 Posts: 284 | RE: AC Fan Switch Issue Yes, the HVAC control units do go flaky with age. A common issue is bad/dirty contacts on the switches. BTW, you can use the one from the W203 C-class so you don't have to pay the G-Wagen tax for a 463 series part. See if you can find the digital version - much nicer than the analogue knobs. And the digital version has complete diagnostics built it. | ||
#241969 - in reply to #241954 | |||
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ychung Veteran Date registered: Aug 2015 Location: SO CAL Vehicle(s): 2004 G500, 2014 ML350, 2008 S550 Posts: 196 | RE: AC Fan Switch Issue I knew that the part numbers are the same for W203 and W463. I've seen a few people getting upgraded control units, but I thought they all require some modifications to fit into dash and all switches and controls to work. Is there one that is plug and play? | ||
#241973 - in reply to #241969 | |||
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Floobydust Veteran Date registered: Mar 2014 Location: Massachusetts, USA Vehicle(s): 1995 E320 Cabrio, 2003 G500, 2000 SL500, 1980 TR8 Posts: 284 | RE: AC Fan Switch Issue See this old thread: http://www.pointedthree.com/disc/forums/showthread.asp?tid=21711&mi... I believe that for an '04 it should be plug and play if you go through the "adaptation" process which can be found online. I had one of these units in my '03. Somewhere I have the analogue unit from my '03 which I might be persuaded to part with (if I can find it). | ||
#241974 - in reply to #241973 | |||
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