Question about 1993 Mercedes-Benz 190

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1988 BMW 735I Defroster blows hot air... I getting a sunburn

The defrosters blow hot air on the windshield all the time. Its so hot I feel like my face is burning. Not really that bad but bad enough I have to keep the windows open even when its cold outside. Is it a fuse? Is it a stuck door? Is it a sensor? Is it a ???

Any information will be helpful. Due to limited funds I must repair myself.


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Have photos, if that help.

But don't know to do attachment.

Posted on May 21, 2009

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The Heater Control Valve has failed. It defaults to full defrost mode when it fails and blows hot air even when the A/C runs. Replacement part is $105 Autohaus AZ for online parts ordering. BTW...HCV is located in the engine compartment right in front of the driver position in the corner by the firewall and inner'll see small coolant hose running to it.

Posted on Feb 15, 2009


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