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Gentlemen
I am restoring a 1940 Packard 120. The Deluxe Heater has a switch with 4 posts to attach 4 wires coming from heater motor. Is there a diagram showing what color wire attaches to what post? Appreciate the help.
Nick

What do the 4 wires go to in the heater, and what is the switch function? For example, is it a 3-speed switch?

Is the heater electric, or connected to the coolant system?

There appear to be two versions of the 4 wire deluxe heater and from what I have been able to document, the wire colors appear to be hooked up differently. At that time Packard typically supplied wiring drawings for accessories on a separate install document shipped with the item and so far, I don't believe anyone has posted or maybe even found a factory deluxe heater drawing for the conventional body cars. The question seems to be if the field and armature are wired with the same colors and if so, whether it is the Brown or the Green wire connected directly to ground.

There are two or three different versions of the switch too. In one version the knob faces toward the passengers, turns right or left and lights up when the heater is on. Another version has a toggle lever under the face plate which slides in a straight line thru the positions. A third known version is a push-pull type switch for use in the Clippers. All are motor reversing, two speeds in each direction.

In operation, the defrost position turns the motor in a direction so the blower wheel is turning and the vanes are most efficient. It will supply a good stream of air to the defrost tubes. The heater uses a bladed fan which in the defrost setting is in effect turning backwards so only a minimal amount of air is able to get out the heater doors. In the heat positions, the motor is reversed so fan is turning the proper direction for a good supply thru the doors but the vanes on the blower are now backwards and not able to push much so there is a minimal amount going to the windshield.

This wiring and photo is documented by Joe Santana from his 40 with a rotary type switch. The second diagram I have is the factory Clipper version of that heater and pull type switch which is wired a bit differently. Since Joe supplied the wire colors and photos from his car with a working heater I will only post that one.