Reply To: 54 Mercury under dash vacuum hose routing

[Virgil & Sue Klein]

I looked at my ’54 shop manual for a routing diagram for the vacuum hoses. There is no diagram for that in the manual. There is a vacuum line from the intake manifold that goes through the firewall to the wiper motor. You can “T” off of that to go to the heater valve on the heater plenum under the dash. This is the valve that has a cable from the lever on the dash. There is a vacuum line from that valve to the heater control valve on the block that exits the interior with the wires for the heater motor and cable for the vent control again through the firewall.

Also, you would “T” off of the main vacuum line to the control that activates the washers. From that control a vacuum line would run to the washer fluid container.

As long as those wires are hidden I don’t think it matters exactly how you route them.