Re: 1987 300E aux fan switch? Also temp gauge ?

Your car might be slightly different but not much different. Your car is
similar to my previous 190E setup. I believe you got only one speed fan.

I would first jumper the temp sensor by your AC accumulator/drier... not the
black one on the top... but the one on the side... probably green or red.
Touch the two bare terminals together to see if your fan comes on... If no,
then you need to check elsewhere.

As for the sensors you have on the top of the engine... the two prong is for
AC and the three is for engine to trigger your Aux... My suggestion is
change those out due to age unless you changed them before. To change these,
engine must be cold.

The relays are in your fusebox... you need to loosen 6 screws and remove the
cover of the fusebox... There will be colored relay with a fuse on it... if
you have two of them... blue and green, then you actually have two speed
aux.


.

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