Thread: W109 3.5/4.5 Identify small fuse boxes in engine bay/AC relay
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Old 09-19-2020, 03:41 PM
werminghausen werminghausen is offline
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Join Date: May 2006
Location: Boston
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I was wondering for a long time what the switch at the drier is doing (could be pressure or temperature).
I just found out that it is a temperature switch at the drier and it is [only] triggering the aux fan to come online when the refrigerant is hot (above 62C). It seems not to interact with the AC compressor directly. The aux fan is triggered by the 2 switches, 100C coolant switch and the 62C drier switch.
I found this diagram attached.
Where is this relay for the aux fan?


Martin
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W109 3.5/4.5 Identify small fuse boxes in engine bay/AC relay-screen-shot-2020-09-20-3.30.31-pm.png  
Last edited by werminghausen; 09-20-2020 at 04:34 PM.
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