Question about 1997 BMW 328

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I have a 1997 BMW 328i- Left it idling in the driveway for about 10 minutes, and it over heated, and started spewing rad. fluid out of overflow tank- let it cool down, took off up the road, and it immediately gets hot again- should i change the thermostat first, or is there a way to tell if the water pump is bad?

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Yes, if the water pump is bad, input hose will be hot output hose will be cool, but that also could mean a bad thermostat.

a way to see if the water pump is pumping coolant is to remove the bleed screw on the thermostat housing and see if coolant spews out.

But it overheats. may as well change out the water pump and get rid of the original plastic impellers. While you're there, replace the thermostat with a 12 degree cooler one and drill 2 3/16" holes 180 degrees from each other in the thermostat.

2.8L motors are sensitive to overheating. you can bust a head gasket this way in no time. Also warp that long cylinder head.

Posted on Jul 16, 2010

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My 96 bmw was doing the same thing.I breeded the radiator,took about 15 min.works great.You must get all the air and bubbles out.<!-- from fixya rte -->

Posted on Aug 16, 2010

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