Cooling system pressure

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jay528ise1985
E30 Zone Newbie
E30 Zone Newbie
Posts: 101
Joined: Sun Feb 06, 2005 11:00 pm
Location: Colchester, Essex

Tue Jul 07, 2009 12:07 pm

Picked up my 320i after the engine swap last Wednesday and it's faster than I ever imagined - I might just leave it as an Eta as I love the way it delivers huge torque from idling speed. It's stupendously fast!

One thing worrying me is that the cooling system seems to hold pressure for a long time, even after it has had a few hours to cool down.

It's had a new water pump and thermostat and warms up and holds the correct temp, the heater blows warm air.

I've bled the system but this morning I drove to work. I went to check it a couple of hours later and the pipes were still rock hard.

I slowly undid the cap and it expelled some air but then wanted to force coolant out - Is this normal????
1989 BMW 320i 2.7 2 door saloon
votivequagmire
E30 Zone Regular
E30 Zone Regular
Posts: 428
Joined: Wed May 24, 2006 11:00 pm
Location: Swansea, South Wales.

Sat Jul 11, 2009 2:53 pm

Sounds like you may have an air lock or the expansion tank cap is not working correctly. It does allow some high pressures to escape when hot.
'88 325i M20, could've done with a sunroof.
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