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E36General discussion and technical help for (E36) 1992-1999 3 series cars. 318, 323, 325, 328.
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Your Ride: 1993 325is
As of late my BMW has gone from a blazing furnace of a heater to mildly warm. I have also noticed that even after having run for over an hour, the temperature gauge is still staying in the high end of the blue on the gauge. Obviously the vehicle is running cold. Any ideas what would be causing this, and perhaps what would fix it?
Definitely sounds like it is time to replace your thermostat. This is tough to do with the fan in place. You can make the tool to hold the fan pulley while you loosen the fan if you have a drill and a grinder. Just find a picture of one on line and you will see how to make it.
Don't forget that the big nut that holds on the fan is left-handed thread!
If your car still has a black plastic thermostat cover, don't try to re-use it. They shrink and warp with time so you cannot re-use them. Either get a new plastic one or get an aluminum thermostat cover.