66 Vacuum System Description


All directions are from from sitting in the driver's seat.

Main fitting at rear of intake manifold behind carb:

Left side port with tube elbow fitting: feeds PB booster.

Left rear 7/32 port: feeds the PD lock coffee can and the vac can under
the right front fender - this hose has a check valve (just about on top
of the valve cover) about six inches from the nipple. If the car has
cruise control, there will be a T that feeds the CC just before the T.
If no CC, then the first T will be about six inches past the check
valve, located at the rear of the right inner fender. The leg of the T
feeds the fender canister, and the straight part of the T feeds the
front port on the right side of the coffee can.

Right rear 5/32 port: feeds the neutral safety switch and continues from
there to the emergency brake release. This hose enters the firewall low
on the right side. On mine it is routed behind the coffee can - I think
this is the correct routing.

Hoses exiting firewall:

On my 66, which is a fully optioned car (AC, vacuum door locks, and
cruise
control), there are three hoses exiting the firewall just above the
heater
hoses and below the vacuum door lock canister. The largest hose, which is
7/32, goes to the vac door lock canister rear port. If the car has CC,
there will be another hose T'd in here feeding another port of the CC.

The 5/32 mid size hose supplies the heater control valve and attaches to
the nipple on top of the valve. The smallest hose, 7/64, tees into the
main vacuum line that goes from the fitting on the rear of the manifold
to the vac canister that is hidden under the right
inner fender. This T is located about six inches past the last T, and
sits midway on the right inner fender. The latter two hoses, 5/32 and
7/64 are connected on the other end to the temperature sensing valve
located in the blower compartment.