'65 coupe. Hissing sound when in gear

[Farmer Pete]

Hi folks. My '65 has a hissing sound coming from under the dash when it is in gear (reverse or drive). It stops when the car is in park or neutral. Almost sounds like a heavy vacuum leak. Any suggestions on what it might be?

Thanks in advance.

 

[didi]

Hi folks. My '65 has a hissing sound coming from under the dash when it is in gear (reverse or drive). It stops when the car is in park or neutral. Almost sounds like a heavy vacuum leak. Any suggestions on what it might be?

Thanks in advance.

Maybe the hose fell of the neutral safety switch, good luck!

 

[Gary Tayman]

My thoughts exactly! Vacuum line at the neutral safety switch. It's fun to reach, it's on top of the steering column.

 

[Farmer Pete]

Maybe the hose fell of the neutral safety switch, good luck!

That was it! Thanks for the suggestion.