vacuum issues

[seeker2736]

Good Day
Been working on my 65 finally got it running again after losing power to the AMP gauge. Now the center vents are not blowing out air. The heater blower is working but hear a vacuum leak somewhere I pulled off the clock housing and found vacuum hoses off for the door locks, put them back on but still here the vacuum sound coming from the center of the instrument panel.
any ideas of where to start to fine the leak. I also pulled out the ac/heater control assembly and check that all the hoses were connected they were
I have the the electrical assembly manual but can't pin point the problem. i can't see where are nay hoses to the a/c register assembly.

[simplyconnected]

Heater control vacuum goes to the switches first, then on to the pancake motors (to open/close doors). Pay attention because some motors are dual-acting and have two vacuum hoses. One hose pulls the door half way and the other hose pulls all the way.

If your hoses are original, you need to buy new rubber. - Dave

[jopizz]

I wish there was an easy answer but there are numerous hoses, T connectors, valves and regulators that have vacuum connections inside the dash. Any one of these could be causing your leak. As Dave stated if the hoses are original chances are they are too far gone. Your best option is to take the dash apart and replace everything. You only want to do this once so do it right.

John

[RustyNCa]

I wish there was an easy answer but there are numerous hoses, T connectors, valves and regulators that have vacuum connections inside the dash. Any one of these could be causing your leak. As Dave stated if the hoses are original chances are they are too far gone. Your best option is to take the dash apart and replace everything. You only want to do this once so do it right.

John

John is 100% correct here, I went down this road with the 65 Special we had. I spent a long weekend getting all those Vacuum lines sorted out under the dash. I ended up replacing most of the lines, the original lines will keep splitting on you as you work through them. I know when I was done, all the vacuum operated items finally all worked correct. On our car, those lines worked the parking brake, door locks, swing away steering, trunk opener, mode doors, and something else I can't remember.

Get a handpump and it will help you sort out what line does what, and allow you to test everything without having to rely on the running the motor. It also allows you to hook into the system and pump away and listen for the leaks. They run like $40 at Harbor Freight.

[RicFlairbird]

I drive a 64 that has no vacuum due to the heater control on the centre console, I'd start looking there... I've been putting the project off myself because as already mentioned once I start looking at it I know I'm going to end up needing to replace, meaning tracing back, every line since it's an original car and it'll turn into a huge procedure

any advice you can share when you're done is appreciated... i'll have to do it eventually

[seeker2736]

leak fixed

Finally found the leak. It turn out to be the hose to the connector
for the rear vents was off. Once I put this back on problem solved for now.

[Yadkin]

If you have to replace the operators for the vents, young look up parts for a mustang of that era, the heating system vacuum motors.