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91 744t - Hissing sound from dash 700 1991

posted by  zuul on  Fri Sep 26 04:38 CST 2008
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last visit: Fri Mar 5 14:40 CST 2010
[RELATED]

I drove my car last night and no problems.

This morning when i woke up and started the car there was a hissing sound coming from the dash... it sounds like a tire with a puncture hole hissing...

The fan was OFF. The heat was OFF. The selector was set on off.

it doesn't matter if i turn the fan on or off

Here's the strange thing. If i put the selector on "defrost" the hissing noise goes away. Any other selection, even off and I can hear the hissing noise?

WTF?

My first thought was heater core? But the heat seems to be working...

Help???
--
there is no dana only zuul






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