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Thanks Grober - I'd already read these pages, but the sentence that reads "remove the fuel tank" is the bit that is presenting me with a problem!

Hi I am looking to remove the fuel tank on my 1985 W123 230E in order to give it a degrease and acid clean. Does anyone have experience of removing the tank? I have removed the sender, drained the tank, disconnected the fuel line to the fuel pump and have removed the four nuts that hold the...

Thanks for all the comments. The definitive answer is that the single pin sensor is the electomagnetic fan switch. The two pin senor relates to the fuel injection system. My local MB dealer is providing me with a list of W123 sensors & part numbers which I will pass on to anyone who woudl...

Thanks - In myW123 I have the two and single pin sensors with the single pin switching the fan, and not the two pin. The two pin is for now a mystery to me

Ok I've isolated the fault to the single pin sensor. When the feed wire is earthed when the engine is running the magnet cuts in. So all I need do is source the sensor. The unanswered question is what is the two pin sensor for. Any ideas appreciated.

Carat - no it doesn't look like your latest photo. I will post a photo this evening. Thanks for your help

Before I start dismantling, is there a relay between the fan and the sensor or is it wired straight through (apart from the fuse that is) Thank you

Carat,,, mine does not look anything like yours which must confirm my assumption that mine is electromagnetic

I have a single pin switch and next to it is a 2 pin switch. The single pin switch has a live feed. When connected to earth the fan doesnt engage. I have bridged the two wires to the pin switch and again to no effect.

I haven't stripped it but was assuming electromagnetic as the fuse box says one of the fuses is for the electrofan. The engine heats right to to the red (120c I think) and the fan does not cut in. It just remains spinning freely

Theres only the one fan. It's free wheeling when the electro clutch isnt engaged. There is no a/c on my car.

Yup - electromagnetic

Thanks for the replies. Sounds like a faulty fan or clutch then as shorting across the terminals in the wire has no effect. If the sensor with the two terminals is the sensor switch to the fan, what it is the single wired sensor next to it?

Hi - My first question on this forum as I recently purchased a 1983 230CE The electric fan isn't cutting in. I'm assuming electromagnetic. There are two sensors going into the block to the left of the thermostat, a single wired sensor and a double wired. From reading, I gather the two wired...