Replacing a/c low pressure switch

[doctordon]

Does anyone know if you can replace the a/c low pressure switch (located on the side of the accumulator) on a 1994 Chevy S10 without purging the freon?

Thanks in advance.

[CharlesW]

Probably not, but I don't really know.
Since the switch needs to sense the pressure in the system, it has to have some sort of access port to read that pressure.
Are you sure you need a new low pressure switch?
It might just be doing its job because of low refrigerant charge in the system.
Low refrigerant will result in low operating pressure and the low pressure switch will open to keep the compressor from running and creating even more problems.
>> Handle refrigerants with care,They can cause severe skin and eye damage because of their low temperature when allowed to escape into the atmosphere.

[doctordon]

Hi Charles,

I'm pretty sure it's the switch. If I tap on the switch with a small hand tool the compressor kicks in. It will run great for a short time (5-15 minutes; sometimes longer) then the compressor kicks off and if I tap the switch again it starts back up.

Once the compressor clutch was engaged I checked the charge with gauges. Pressure is within specifications.

[atkinsonair]

Just unhook the wires and unscrew it, you only lose a a little spit of refrigerant. Did you know freon is a brand name, by dupont.

[doctordon]

Hi atkinsonair,

Thanks for the reply. Yes, I know the word "freon" is used incorrectly at times. Just as people call all tissues "Kleenex" and all copiers "Xerox".

Thanks again.

[GearHead_1]

Pretty sure that switch uses a Schrader type valve. Shouldn't have to evacuate the system for a direct replacement.

[doctordon]

Hey - Thanks to all who responded. I replaced the switch today and all is well.

As atkinsonair said only a spit of refrigerant came out. I know many people in other parts of the US are freezing now but it's in the low 80's here in Florida and I'm glad to have the AC working again.

Thanks again!