The coolant level Check control light on my 1987 E 30 320i came on
and has stayed on. I checked the level in the expansion jar, and it is
OK. I conclude that the sensor is faulty.
Is the sensor reparable ? I visited our local breaker's yard (in
France), and not one sensor remained in the E30 wrecks. Is this then a
common problem ?
Any pointers will be gratefully received. Many thanks in advance.
It's quite a common problem - little plastic float or it's mount breaks.
Be sure to get all the little bits out of the radiator when you replace it -
you don't want it to get into the engine and thermostat...
They're relatively inexpensive, why don't you just buy a new one?
Check the wires carefully too, they get hot and then brittle over time,
right where they connect to the sensor and back about 8". The sensor could
even be ok, just needs a new foot of wire grafted on in place of the brittle
stuff. You can check the sensor operation easily by putting a mulimeter
across the contacts and moving it up and down with your hand.
I don't know how common the problem is, but why on earth would one buy this
part Used? It isn't expensive, and if the used one is as good as the one you
already have, then why bother? Get a new one and stop messing around with
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