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mrderp83 11-12-2012 07:35 AM

I am having an issue with my heater on a 1998 740il. The blower motor is working fine, however the heat will not come out until I start to drive the car (only blows cold until i drive). I do not know what causes this. Anyone have any solutions? Thanks.

rrtec 11-12-2012 09:23 AM

Check your coolant level, be sure that the system is properly bled out as trapped air in the heater coil can cause this. Have you recently serviced the cooling system?

mrderp83 11-12-2012 11:10 AM

The radiator was flushed out about a month ago. Not sure if this problem existed before the radiator being flushed. I will check the coolant level, however I am not sure on how to bleed the coolant system. Any insight would be much appreciated! Thanks for your help.

setconstr 11-12-2012 05:26 PM


BMWFatherFigure 11-15-2012 12:56 AM

From memory there is a valve or switch that prevents the heater (heat) working until the engine is up to temp. This item may be giving problems.

mrderp83 11-15-2012 10:58 AM

Well the thermostat shows that the car is warm. I will be trying to bleed the system this weekend. Do you guys know where this bleeder screw is for the cooling system? Thanks!

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