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  #1  
Old 03-27-2007, 10:39 PM
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Join Date: Oct 2006
Location: Pennsylvania
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HVAC issues solved- mostly...

I finally figured out what was blowing the #8 fuse last week. After checking over the blower which had worn brushes but OK, found a burnt trace in the ACC unit which I repaired with a jumper, burnt trace caused by aux water pump- unplugged for now, and mono-valve still unplugged due to intermittent heat supply. I went thru about 10 fuses unplugging different components and finally arrived at the compressor relay, which I had ignored because the compressor was unplugged. So the relay actually turned out to be bad, causing a 25A fuse to blow. Frustrating, but all is good now because the heat works again
Now I just have to work thru the carnage and replace/repair what I found. The old adage stands true- there is nothing more expensive than a "cheap" Mercedes!


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Old 03-27-2007, 10:57 PM
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Magoo,

Which of the four relays on the CCU board did you decide was associated with the compressor? I have some overheating in and around one of them and have been thinking that it might be due to a higher than normal current draw from the A/C compressor. Would really like to know what the load item is for each of those relays on the main CCU board.
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Old 03-28-2007, 12:06 AM
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Quote:
Originally Posted by Lycoming-8 View Post
Magoo,

Which of the four relays on the CCU board did you decide was associated with the compressor?
None of them are associated with the compressor.
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Old 03-29-2007, 09:36 AM
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The compressor relay I was referring to is located on the driver's side inner fender, under a black plastic cover just forward of the fuse panel. This enclosure also houses the aux fan relay. The compressor relay is closest to the front of the vehicle and the aux fan relay is closest to the firewall. Near as I can tell from the schematic and as tangofox stated, none of the relays in the pushbutton control are in the compressor circuit.

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