Re: 1941 power windows

Posted by HH56 On 2011/1/27 18:44:44

All Packard hydraulic windows used brake fluid. Pre war pumps are unique and apparently good ones are somewhat hard to come by. They have a separate reservoir container and mount horizontally under the floor. Pump is reversible & turns one way for pressure up to raise and reverse direction for a suction effect helped by the spring to lower. Solenoid valve is inline with the hose to cylinder.

Postwar pumps are vertical and firewall or fender mounted, have an integral reservoir, and only turn one direction for pressure out to raise. Down relies on pump remaining off, just opening the solenoid valve built into the cylinder and spring pressure then pulling the window down.