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#1
05-23-2005, 05:13 PM
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W140 What is a Heater Supply Unit Circulation pup
I just checked the Air Conditioner Diagnostic codes on the LCD display.
I'm getting a E0 76 (Heater Supply Unit Circulation pup (A31m1) over load E0 77 (Heater Supply Unit Circulation pup (A31m1) over load Can anyone be so kind as to give me a description of a Heater Supply Unit Circulation pup?
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Russell McMahon Tulsa, OK 2001 CLK 320 1992 400se 1993 400e 2000 320ML 
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#2
05-23-2005, 08:12 PM
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A31 is the Aux Coolant Pump. Its not much more than a small electrically driven pump assembly. I suspect the motor that drives the pump is seized.
Anyway, located in the front of the engine compartment on the driver's (left) side. Not hard to find; its got coolant tubing running to and from it. Hope this helps.
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KenP 1996 S500 W140 Coupe
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#3
05-23-2005, 09:54 PM
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This is what it would look like for my car:
http://img.eautopartscatalog.com/live/G305013421BOS.JPG
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2007 C 230 Sport. 
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