Just finished fixing up my AC system, and the last leak was in the pressure cutoff switch that is on one of the lines coming from the drier (I have the Denso system).

It doesn't seem like the OEM switch is available from Mazda anymore, and I can't find any specs published on what pressures the switch cuts off for. The OEM switch had already been replaced with a generic aftermarket switch as well, so I don't even have the stock one to play around with.

Does anyone happen to know what the pressure specs on the switch are? Right now I just have a universal one installed that cuts off at pressures below 30 psi, but I'd like to make sure the switch I use long term is a similar spec to the original switch.

 

Hope this helps! From the 1994 Factory Body Electrical Troubleshooting Manual:

 

Thanks! That's exactly it. Looks like low cutoff should be in the 28-34 psi range, and high cutoff in the 300-412 psi range. I will have to verify the high cutoff range on my switch.

Can I ask where you found this section of the manual? All I could find online this weekend was "Engine Electrical", and I don't believe my physical copy of the 93 FSM has this section either.

 

Santech, Forth Worth TX , MT0621 binary pressure switch for A/C

https://www.ebay.com/itm/A-C-Binary-...75.c100623.m-1

 

Try this link

 

What generic is in there (make/model) and does it threat into the oem spot or did you need to get a custom fitting made to fit the generic?

 

The Santech linked above in this thread is what I have been using.