AC pressure switch reccomendations?

[YY1]

I finally got a chance to pull a vacuum on my AC system and it held nothing, not even for a short time.

The only place I see dye other than where it spilled all over the place from the poorly designed dye injector I bough at Advance Auto...

...and the minor dots here and there on the condenser...
...is on the male spade connectors on the front of the pressure switch.

This does jive with where I saw the cloud of gas escaping and I know switches do go bad.

Searching rockauto turned up nothing (somewhat surprisingly).

Ebay returns 99% modern switches with plugs.

I did find an OEM Mopar switch but the application list is 1990's only, and it has a black O ring instead of green. It also takes a special tool, like an oil sender socket.

I also found a mercedes OEM part for 1980's applications but it does have a green O ring.
It has a normal hex body for a wrench, but my be metric.

Are the threads all the same?
Are the pressures all the same?
Anyone got a link to one they know works (that ain't more than $20-$30 bucks)?

 

[493 Mike]

Try Vintage Air or another manufacturer. Rock Auto?
Mike

 

[Ronnman]

Not sure of your year, but guessed 1973. eBay link of search found two. Not sure if this is the switch you need, but these mount to the Filter-Drier. https://www.ebay.com/sch/i.html?_fr...=1973+mopar+ac+high+pressure+switch&_osacat=0

 

[YY1]

Bought.

Last one!

@Ronnman

You da MAN!

 

[YY1]

...and it looks like there might be a safety blow-off hole in the middle, which could be the source of my leak!

 

[Ernie ingling]

Old high pressure plug is designed to melt at high head pressures. So suspect problem in system be sure to have both low and high side gauges hooked up.
Also need to replace drier to remove moisture.

 

[RJRENTON]

Try Vintage Air or another manufacturer. Rock Auto?
Mike

How about the selling dealer of the car brand. The switch will likely more $$$ than RA or Napa but may be worth the higher cost. Just a thought....
BOB RENTON

 

[YY1]

Already have a new dryer.

Don't think that got replaced when it was converted to 134.

...but it's been going pretty cool for the 9 years I've had it until this spring, plus a few before that.

 

[Ronnman]

The drier has a relief valve in it to the handle the over pressurization.
Ron

 

[YY1]

I'll check again, but the dye is squarely on the insides of the spade connectors of the pressure switch.

 

[Ronnman]

The switch can definitely leak. I just do not remember it being a relieving type safety device.
Ron

 

[YY1]

Switch came in last night.

Bought 5 cans of R134a (Autozone had them for 5.99 without sealer or dye).

I am booked today and have a rough week ahead so likely will have to wait until next weekend. Might be able to pull a vacuum and let it set overnight one evening next week.

I did drive the Satellite to get the r134 though...before we got the bands of rain from Fred.

 

[YY1]

New dryer and switch ready to go on.

Old one and tight working conditions.

new dryer has relief valve, did not see one on old one.

This is why wrenches are "offset"- VERY tedious operation.

Old fitting had black O ring.

other side had green.

New assembly in.

Parallax error, but dang near 30 inches.

two hours later.

Left it over night.

actually had time to jam a bit and have a beer.