Plug on ac condenser 69 Polara

[polarnj]

1969 dodge polara
I have these open prongs on the ac piece under the hood, can't find what's supposed to plug into it. Where does the plug come from? I'm assuming it's one of the wire harnesses on the pass side? Can't find the plug anywhere

 

[Big_John]

That is a low pressure switch. It keeps the compressor from coming on if the freon is low. It's attached to the dryer.

That said, I don't think the '69 used that switch. Probably the dryer it's attached to was changed and the switch left in to plug the hole.

 

[polarnj]

Hmm didn't know that it didn't come that way, probably explains why I can't find the plug

 

[CBODY67]

The drier looks correct for the vehicle, not an aftermarket replacement, so it might have come from a salvage yard? Seems like our '72 Chrysler had a low-pressure switch on it?

 

[polarnj]

So the ac should work correctly even without that plug attached?

 

[volksworld]

yes...assuming your system didn't use one to begin with (my 68 didn't have one, idk what year they started to use them)...if you wanted to make it functional you would take the wire that goes to the compressor clutch and run it through that switch

 

[CBODY67]

So the ac should work correctly even without that plug attached?

Yes, on the earlier cars, everything was identical except they did not have that low-pressure cut-out to cut the compressor off when the gas got lower than a certain point. Usually, the cooling performance decreased enough you could tell when it was 1lb low.

Where the switch came in handy was when you punched the a/c on after a winter of not using it and it didn't cool at all. I know the Slabs didn't run the compressor in the "Defrost" mode (to help dehumidify the air before it got heated), but at some point in time, the Fuselage cars did have that situation.

Enjoy!
CBODY67