3-Series (E21, E30)Chat relating to the BMW 3-Series from 1975-1983 and 1984-1991 line. Specific models: BMW 315, BMW 316, BMW 318, BMW 318i, BMW 320/4, BMW 320i, BMW 320/6, BMW 323i, BMW 320i. E30 Family models include: BMW 325e, BMW 325i, BMW 325is, BMW 325ix.
Check your thermostat, When I bought mine it didnt heat up all the way. I went ahead and bought a new thermostat thinking that was probably it. Mine was somehow broken and was partially open. They are cheap and easy to change.
My cabrio did the same thing.
I bought the car from down south. I live in New England. I found out that the thermostat that was in the car was for higher southern temps and it ran cool. I replaced it with a new themostat and voila - the temp gauge is now right in the middle!
You will know the thermostat is working if the lower rad hose [ goes from lower-rad to thermostat housing on a 6 cyl ] stays cold until the engine warms up, at which point it will get warm (when the thermostat opens)
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