Vacuum canister issues

[Yoda]

I just finished replacing a bunch of vacuum hoses under the hood of my 65 convertible and I was wondering about the two canisters. There is one to the right of the passenger hood hinge and one to the right of the transistorized ignition.

From searching old posts, it sounds like the one by the hinge is to boost/regulate the power door locks, but what is the one by the transistorized ignition for? It has one very small hose and one larger hose. The larger hose has some sort of small filter just past the canister connection. When I pulled the hose off the small filter, I found that it was clogged with a tar-like substance. Any idea what causes this and if the filter is a readily available part? It also seems that the metal tube used to connect the smaller hose was broken off at some point in the past and then affixed back to the cannister with some sort of putty. Any suggestions on how to remedy this?

Thanks in advance.

[Joe Van Datta]

I have two vacuum tanks on my 66, both supplied from one vacuum source off the intake manifold with a ck. valve in the main line. My car has all kinds of vacuum motors for the A/C plus door locks and I suspect that is why it came that way--need all the vacuum reserve you can get. One is on the right fire wall and one is in front of the right wheel well and hooked up to the common vacuum source.
Joe

[tbird5866]

The vacuum can by the hood hinge is for the door locks - not for boost, just for reserve so that you can operate the door locks without the engine providing vacuum. The other can - by the transisterized ignition and the battery on the 1965 is reserve vacuum for the AC/heater. The small device you referred to as a filter is the vacuum check valve, to hold vacuum in the can after the car is shut down or maintain vacuum whenever the engine is being operated with low manifold vacuum. Any more questions?

[Yoda]

Nope. I think that covers it. I'm going to try to blowout the check value to get the 'tar' substance out of it. If not, I'll try to find a replacement.

Late last night I finally found the coverage of the front canister in my shop manual in the A/C heating section. Honestly, it was the last place I thought to look because I didn't realize that the HVAC system was tied to the vacuum system. Live and learn.

Thanks for the responses.