I have the wire disconnected for the thermostat temperature sensor (on my Zenith carbed M130).

Is this sensor just for the auxillary fan, or does it work with the choke circuit, also? Thanks in advance.

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1970 280S M130 engine- good runner
1971 250 M130 engine- #2 rod bearing, gone
1971 280SE (blown engine,parts car)
1977 German 280S W116-only 33 years old

You're talking about the switch on top of the thermostat right?

It's main purpose is to enable the Aux fan, but if your emmission are hooked up it will also enable the vacuum advance to switch over at idle to assist in cooling...

Which is why when you're supposed to set the fast idle for 2600 RPM you're supposed to ground that switch.

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72 250 M130 W114