Whats this sensor?

[mike65]

Can anyone id the red two pin sensor...

Cheers

Mike.

 

[guydewdney]

give us a chance?!!

engine type? car year? was it connected? does it have a part number on it?

why?


i bet its a temperature sensor / sender of some sort.

 

[sunil sood]

which car is it?

could be the fan switch which activates the electromagnetic clutch fan-just a guess.

 

[mike65]

He he! Sorry, its a 190e 2.0 petrol 1990 model.

Mike.

 

[sunil sood]

He he! Sorry, its a 190e 2.0 petrol 1990 model.

Mike.

that's better!

same answer as my previous post

 

[sunil sood]

http://forums.mercedesclub.org.uk/viewtopic.php?t=6286

your answer also lies in the above link

 

[mike65]

It sounds about right -

The thermo-switch had failed. This is the brass coloured 'jobby' at the front of the head beside the thermostat. A 22mm deep socket is required to remove and replace. The electrical connector is rectangular in shape and there are 2 pins on top of the thermo-switch. The original had an aluminium sealing washer, the replacement came with a copper one.

You can test if the electro magnetic clutch is functional by bridging the two connections of the rectangular plug with the ignition on - you should hear a 'clunk' and you will be unable to turn the fan by hand - unlike the condition without the bridge or ignition off when it should freewheel.

What should I use as the bridge? Metal object or copper wiring?

Mike.

 

[sunil sood]

It sounds about right -

What should I use as the bridge? Metal object or copper wiring?

Mike.[/quote].

what are your symptoms on the car?

is it overheating in slow moving traffic conditions?

if so,then bridge the the connections with copper wire on the connector(not the thermoswitch),and if you hear the clonk of the electomagnetic clutch engaging,then you know yor clutch fan is working properly.
this should be with the ignition on,
it could be risky if you did the test with engine at idle,so watch your fingers!