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Old 09-29-2011, 19:47   #1 (permalink)
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1965 T Bird hissing under dash

Very noticeable hissing under the dash, but only when in R or forward gears. Silent when in P or N.
Is this normal?
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Old 10-01-2011, 03:30   #2 (permalink)
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Re: 1965 T Bird hissing under dash

Dont know anything about that year / car but sounds like a vacuum leak . Could check brake servo / booster and hose if it applies to your car .
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Old 10-02-2011, 22:21   #3 (permalink)
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Exclamation Re: 1965 T Bird hissing under dash

Quote:
Originally Posted by jwandhistools View Post
Very noticeable hissing under the dash, but only when in R or forward gears. Silent when in P or N.
Is this normal?
Check your Neutral Safety Switch vacuum connections. The NSS has a vacuum switch which provides vacuum to the parking brake automatic release. It is under the dash, on the steering column.
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Old 10-03-2011, 10:17   #4 (permalink)
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Re: 1965 T Bird hissing under dash

Will do. Thanks.
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