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My guess is the head gasket, have same problem. Nightmare

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Q: 94 BMW 325i overheats and heater blows cold air replaced thermostat water pump and flushed system what's the problem?
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Ive replaced the thermostat water pump and flushed the radiator on my 96 Chevy lumina and now it jumps from 125 to 260 while im driving It also overheats while im driving.?

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Ok you have a 00 Montana 3400 you have replaced the thermostat 2xs water pump 2xs front heater core radiator intake gastket and flushed the rear heater core and it still overheats?

I don't know how old this question is, but we had a similar problem, it turned out a head gasket was leaking. We've had it replaced and the van has been driven about 500 miles since then without overheating. I'm sure that's not what you wanted to hear, but I would find out if that's the case with yours too.