My AC pressure switch under the battery tray is leaking, as pictured. I want to fix this before it has a chance to cause me grief through my AC leaking down and stopping in the summer or oil starvation of the compressor causing a nightmare scenario. Do any of you folks have pictures of this switch on its own and the following information?

• Is it the Schrader valve or threaded fitting type switch?
• What size o-ring does it take assuming it has one?
• What's the part number of the switch? Or is it time for me to hit the used market?
• What size wrench fits it? (When I briefly inspected it I was unable to get access to it with my calipers or adjustable wrench to check and want to just get a crow's foot to get at it)

I searched the forum, the PDF parts diagrams/service manuals I have, and the parts listings on mazdausa and couldn't find this thing anywhere. It's visible on the parts diagrams as part of the pipe 61-466 but has no number of its own. I want to find out if the switch itself is leaking or its fitting but I'm not even sure what type of switch it is. Generally there are two types; one screws onto a Schrader valve and can be removed or replaced without evacuating the system, the other type is just threaded on and the system must be evacuated to remove it which sucks. Both usually have an O-ring which can be the culprit for the leak or if you're unlucky the body of the switch can leak too.

Thanks in advance.


Parts diagram



Leaking FD AC pressure switch

 

I THINK it's an O-ring on the switch but not totally sure. It's not a common leak I don't believe.

Dale

 

There is an o-ring under it. The pressure switch is a sealed unit

 

Here’s everything you should need, the sensor is a 21mm btw.

 

Crap, I will have to evacuate the AC system to fix this since it isn't the Schrader valve type fitting. Thank you @CREEPENJEEPEN it looks like I'm either going to need two crows feet for this to counterhold the cube the sensor screws into, or will have to pull the battery tray.