I just bought a 1988, 528e and it worked fine for a while. Now the temp gauge shows me that its getting hot. Had a new radiator when I bought it, I put in a new thermostat, the fans work fine. Now here is the deal. After it warms up to mid point and I put on the lights the gauge goes towrads red, turn the light off, gauge back to normal, same when I use the heat. Also even without that it starts to show hot, when I don't think it really is, If it gets into the red zone the car starts to sputter and I turn itr off. As soon as I turn it on again within 5 seconds the gauge is back in the middle. Is this electrical??? or what.
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if you have any suggestions or if has happened to you.