Bmw 525i Automatic

Just drained of the water system to add anti-freeze for the winter. After refilling the water & the anti-freeze the temperture gauge goes into the
red and the water boils in the radiator. But the interior heater blows cold what could this be?
I'm also getting check coolant level on the in-board computer every time i start the car and turn it off any solutions?
Many thanks
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onlyonegeezer

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onlyonegeezer wrote:

You haven't gotten all the air out of the system. It might help if the group had SOME CLUE as to your car's year and model.
Repeatedly letting it go into the red WILL cause a head-gasket failure, hopefully this hasn't happened already.
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Air lock. Turn the heater full on and open the radiator's bleed valve. You'll probably need to add more coolant too.
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You haven't bled the air out of the system. Do a Google on this on how to do it for your particular model which you haven't been clear about here.
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Dave Plowman snipped-for-privacy@davenoise.co.uk London SW
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It sounds to me like you have developed an air bubble in the cooling system.
There is a cross-head kind of screw next to the Fill Hole, this is the bleed screw. It releases trapped air
1.) Open the screw. 2.) Turn the ignition On, but not Start. 3.) Set heater controls to full hot for both sides. 4.) Add coolant until it comes out of the bleed screw. 5.) Close bleed screw. 6.) Start motor and allow it to come up to temp. 7.) Shut the motor down, wait to cool, top off with more coolant if needed.

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On Wed, 28 Sep 2005 18:45:07 +0100, onlyonegeezer

Any time a car heater blows cold despite the engine being warm, it's time to check the coolant level. The heater radiator is usually one of the highest parts of the system, so one of the first to show a lack of the warm stuff.
You've got air in the system, turn everything water related on (heater etc), top up the water, run the engine up for a couple of minutes, turn it off again, top it up. Then check the level again when cool.
And if you're really paranoid like me, stick a couple of bottle of water in the boot for good measure.
Dodgy.
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