Thermo Vacuum Valve - Electrical Sensor in its place?? - PeachParts Mercedes-Benz Forum

whunter · #1 12-10-2011, 07:52 PM

Quote:

Originally Posted by SpecialDelivery

Check this out...I'm going about rebuilding my first Benz..a 1982 300SD I'm working on the 3/2 vacuum "situation" and I see this strange sensor where there should be a vacuum thermo valve

So I bought a thermo vac valve, and the diameter of the threads is significantly smaller than the hole this sensor is mounted into...can anyone shed some light here? I cant find any info about this in the FSM, or elsewhere...maybe I havent looked hard enough?

another view..

any info you vets could share with this n00b would be greatly appreciated!!

You are worried over a none issue.
Disconnect and plug the EGR vacuum circuit, it is useless + sludge's the intake ports/manifold.

The device in the thermostat housing is a temperature sensor, look for the wire, but if all the gauges work = someone may have swapped out a corroded thermostat housing for one from another engine.

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tangofox007 · #2 12-11-2011, 08:27 PM

Quote:

Originally Posted by whunter

The device in the thermostat housing is a temperature sensor, look for the wire, but if all the gauges work = someone may have swapped out a corroded thermostat housing for one from another engine.

It is not a sensor and it has nothing to do with gauges. It's a thermal switch that prevents the heater from blowing cold air.

whunter · #3 12-11-2011, 09:00 PM

Quote:

Originally Posted by tangofox007

It is not a sensor and it has nothing to do with gauges. It's a thermal switch that prevents the heater from blowing cold air.

If the system is functional without it, there is no issue.
I note there are two switches, top and side of the thermostat housing, and the side unit is connected.

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