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Old 03-27-2002, 11:00 AM
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pmizell pmizell is offline
Benz Zealot
Join Date: Jun 2001
Location: Houston, Texas
Posts: 838
Thanks Arthur for pointing that out ... I was referring to the '86 model 300E shop manual, so I suppose this circuit has changed since then. The sensor appears to be a 3 pole in the diagram, as opposed to the 2 pole that's on my '91.

The manual notes:

"As a protection against engine overheating an emergency cut-out is provided. After reaching approximately 115c engine coolant temperature, the switch is closed (grounded)(diagram pointing to head temp sensor) and the A/C compressor via control unit is cut-out. The switch opens at approx. 108c and the A/C compressor is then re-engaged."


'91 300E, 208k miles
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