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Leaking Thermoswitch


Regarding your leaking thermoswitch on the MC engine.
I have taken the 4 pin variety apart and they are made from one piece that is machined
brass/bronze so I don't see how they could leak internally. Is it possible that the 
aluminum flange that the thermoswitch is screwed into has a hairline crack? 
Or possibly the sealing washer contact area is corroded on the flange?

Scott M.
89 200TQ with 2 knock sensors, MOHB EPROM 
and STEADIRIC suspension kit, stiffly riding and clunking along, 
Waiting for my kit instructions and $100 check