Overheating Problem?

[tbs04]

OK new rebuild on a 1997 328is. New water pump, new thermostat, flushed radiator (good flow), new hoses, no leaks.

The coolant temperature sensor was bad so I bypassed it to turn on the auxillary fan. Let it idle till operating temp, then she revs higher R's and over-heats. What the He77 is happening? Seems like the thermostat isn't opening.

Help Me Please

tbs04

[tbs04]

it's OK. Then started the engine and expected to see coolant gush out of the thermostat port. Trickle at best. What's up with this POS?

[grafhky52]

do you have the thermostat in backwards or upside down?

[tbs04]

Thanks shes running! no over heating.

[Jeron]

What was it? Let me guess, air in the sytem.

[tbs04]

Yes. I had blead the system twice. Guess the third time was the charm.

Thanks

[Jeron]

Don't feel too bad. I had the same problem recently and I answer overheating questions weekly.

The problem is you cant bleed it if you skip even one of the steps.

1) hot
2) heater on
3) bleed screw open
4) rev the engine to 3k-ish for sustained periods
5) kill engine
6) refill coolant
7) repeat