65 polara heater controls

[Polara_500_Jr]

Traced out my blower motor issues to being in the heater/AC controls. power goes in, doesn't come on when the hvac system turns on.

Anyone disassembled one of these switches? I might try repairing it in the future, but for now it's bypassed and the fan runs on low at all times.

Or else, might be interested if someone has a heater/ac switch available that works for a good $$

 

[CBODY67]

Seems that the plastic switch part of the instrument panel controls is common for many years of vehicles. 1970s switches were common on lots of motor home chassis vehicles, too.

If you find a 7-digit stamp number on the plastic, that is probably the Chrysler part number for the year of the car it's in. You might Google "Chrysler _______" and see what comes up.

Just some thoughts,
CBODY67

 

[Big_John]

Traced out my blower motor issues to being in the heater/AC controls. power goes in, doesn't come on when the hvac system turns on.

Anyone disassembled one of these switches? I might try repairing it in the future, but for now it's bypassed and the fan runs on low at all times.

Or else, might be interested if someone has a heater/ac switch available that works for a good $$

This switch or the fan switch?

How To Rebuild a Vacuum Heater Control Switch

 

[Polara_500_Jr]

This switch or the fan switch?

How To Rebuild a Vacuum Heater Control Switch

This would be the vacuum switch. the blower motor switch I took apart, cleaned up connections and reinstalled.

The blower motor fan works fine, but when the vacuum switch is turned to OFF it 100% stops the blower motor, rather than always running at some speed as it is now.

 

[Sixpactogo]

when the vacuum switch is turned to OFF it 100% stops the blower motor, rather than always running at some speed as it is now.

Some of them were setup to run on low speed when the ignition is on. If your vacuum switch is a 3502 126, that is what they do. No idea why.
Someone told me that they all are superseeded numbers but all work the same. They do not. Most will work but some do different things in different modes.
For example from my testing PN: 3895 790 runs the compressor constantly whenever in defrost mode PN: 3502 126 runs the blower motor on low with the heater switch off and ignition on
The following PN's seem to operate the same: 2820 487, 2571 501, 3431 017, 3431 020, and 3895 033.
Those are the switches I compared. I know there are other Part numbers out there but these are the ones I tested.

 

[CBODY67]

Some of them were setup to run on low speed when the ignition is on. If your vacuum switch is a 3502 126, that is what they do. No idea why.
Someone told me that they all are superseeded numbers but all work the same. They do not. Most will work but some do different things in different modes.
For example from my testing PN: 3895 790 runs the compressor constantly whenever in defrost mode PN: 3502 126 runs the blower motor on low with the heater switch off and ignition on
The following PN's seem to operate the same: 2820 487, 2571 501, 3431 017, 3431 020, and 3895 033.
Those are the switches I compared. I know there are other Part numbers out there but these are the ones I tested.

The compressor running all of the time, plus the super-low fan speed when the "OFF" button is pushed started with the OEM 1972 models, best I can tell. There is a temp sensor somewhere to keep the compressor off if the ambient temp is lower than 32*F. Our '72 Newport Royal is that way from the factory. Allegedly to keep a rush of humid air from hitting the windshield in cold weather, when the "DEF" button is pushed. Probably the same way for the constant-running fan?

In that system, there is also a switch on the water valve cable, to cut the compressor off if too much heat is desired (like 1/2 way open).

Thanks for the comments and part numbers,
CBODY67

 

[WissaMan]

Inside these HVAC vacuum controls, there is a little rubber block with an "H" pattern to switch the vacuum to the different ports. Does anyone know of a source for those little rubber blocks?