Heater on working at high speeds?

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Junglistjed
E30 Zone Regular
E30 Zone Regular
Posts: 472
Joined: Sat Jul 13, 2013 11:00 pm

Post Sun Dec 08, 2013 4:22 pm

The heater will only blow hot air when the car is at high speeds, soon as the car is stationary no air is coming out?

whats causing this? its getting colder now and my windscreen keeps steaming up so want to sort this asap!

cheers
Grrrmachine
E30 Zone Wiki / Team Member
E30 Zone Wiki / Team Member
Posts: 8043
Joined: Sat Feb 09, 2008 11:00 pm
Location: Warsaw, Poland

Post Sun Dec 08, 2013 5:20 pm

A combination of a seizing up blower motor due to lack of lubrication, or a failing heater resistor, together with a charging system that isn't charging properly, and therefore can't supply enough juice to compensate.

Get a multimeter onto your battery terminals and find out what the voltage is at idle and at about 2000rpm.
Junglistjed
E30 Zone Regular
E30 Zone Regular
Posts: 472
Joined: Sat Jul 13, 2013 11:00 pm

Post Sun Dec 08, 2013 5:33 pm

Will it be an expensive fix? ill try get hold of a multimeter asap