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5-Series (E12,E28, E34, E39, E60) Chat relating to the BMW 5-Series of all generations. Specific models include: BMW 518, BMW 520, BMW 520i, BMW 530i, BMW 528i, BMW 530i, BMW 518i, BMW 524d, BMW 525i, BMW 525e, BMW 528e, BMW 540i, BMW 535i, BMW 520d, BMW 525td, BMW 525d, BMW 530d, BMW 525i/xi, BMW 530i/xi. (BMW 5-Series Forum)

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Old 05-27-2013, 12:41 PM   #1 (permalink)
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No heat after changing heater core and thermostat

Hello everyone;

Replaced heater core(new) and heater control valve(used). let car sit and run for about 20 mins before starting to overheat. No heat from vents.
Replaced thermostat and car still overheats with no heat from vents.
Help anyone !!!
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Old 05-31-2013, 12:20 PM   #2 (permalink)
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Is your water pump working?
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Old 05-31-2013, 12:33 PM   #3 (permalink)
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Replaced water pump and now have heat.
But now the floor vents for the back seats are not blowing any air.
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Old 05-31-2013, 02:19 PM   #4 (permalink)
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You may want to run your heater for little bit to get out all air bubble out of the cooling system. Set the heater on recycle air and run it full blast on high-heat. I think once all the air is out, the rear heater will kick in.

Out of curiosity; does the car still over-heats?
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Old 05-31-2013, 04:06 PM   #5 (permalink)
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No more overheating... Getting heat from all front vents.
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Old 05-31-2013, 05:04 PM   #6 (permalink)
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That is great. Glad that the over-heating is resolved.
And as far rear vents, I think that once the air is out of the cooling system, the air will kick in. Just make sure you are running your heater in manual mode and not the auto mode, and set it on recycled air.

Best of luck and please provide an update when you have time.
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