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post #1 of 4 (permalink) Old 09-29-11, 07:47 PM Thread Starter
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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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post #2 of 4 (permalink) Old 10-01-11, 03:30 AM
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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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post #3 of 4 (permalink) Old 10-02-11, 10:21 PM
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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.

Master ASE Certified L1 Chrysler Technician- still a Ford fan at heart.
1964 Thunderbird Hardtop- Chantily Beige- 390 FE 4V V8-Uncle's Car
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post #4 of 4 (permalink) Old 10-03-11, 10:17 AM Thread Starter
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Re: 1965 T Bird hissing under dash

Will do. Thanks.
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