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Hissing in dash

 
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QuickNick
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2004 Chevrolet Impala


PostPosted: Thu Jul 10, 2014 8:54 pm    Post subject:  Hissing in dash Reply with quote

2004 Impy. Last week a hissing started in/under the dash, right about the center of it from underneath. Lucky me, at the same time the A/C went from "not so good" to "not at all." Crying or Very sad Its not there when the blower motor is off. It sounds like a good ole' vacuum leak.

I havent snooped around yet, but arent the A/C/heat controlled electronically & not by vacuum? I may be wrong so thats why I'm asking. Dont say its snakes Laughing I need to take a look at it this weekend, just like to know what I'm looking for.
Thanks!
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Irish_alley
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2004 Chevrolet Impala
1986 GMC Sierra
1994 Chevrolet Silverado
1984 GMC Sierra
1979 Chevrolet Silverado
1991 Chevrolet Silverado


PostPosted: Fri Jul 11, 2014 12:02 am    Post subject:   Reply with quote

could be leafs in the air intake and they are rubbing against the fan blades

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QuickNick
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Joined: May 27, 2013
Posts: 196
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2004 Chevrolet Impala


PostPosted: Fri Aug 01, 2014 3:03 pm    Post subject:  D'oh! Reply with quote

Thanks Irish!
Well, I pretty much took the whole dash apart & fired it up to look around. Hissing was still there with the blower motor unplugged & the fan on Question After a little head scratching I wound up in the center of the dash. Its the A/C evaporator core. ouch! Thats not going to get changed until the day it needs a heater core & hopefully not by me Laughing Feel pretty stupid now for taking so long to figure it out, live & learn.

Sooo, anybody know of a good A/C sealer?
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