R12 evaporator thermostat r134 thermostat

[Eddyg]

(92-95 Honda civic) will a r12 evaporator thermostat sensor fit on a r134 evaporator? And difference??

Topic

[Matt]

Uh, are you talking about a pressure switch? I would hazard to guess that they are different, but I’m not sure if that’s what you are talking about….

[Eddyg]

Idk if it’s a sensor or a switch but it’s mounted in the evaporator. I have a 93 Honda civic with the r12 unit but going to be replacing it with the r134 unit.. The only difference is that the r134 came with the 3 pin plug type (evaporator thermostat) and the r12 came with 2 pin type. I was just wondering if can just switch out the r134 sensor with an r12 sensor and if it would make any difference??

[college man]

I believe the original R12 t-sat can stay.

[Matt]

Oh, wow, I didn’t know Honda actually used a temp sensor. Learned something new there.

[Eddyg]

Yes they do.. And I just need to if theyre compatible or not and what difference it would make.

[Matt]

I’ll forward this one to Eric. He’s prolly taking tomorrow (today now) off, ‘cuz it’s father’s day. But I bet he will be able to help ya.

[Eddyg]

Thanks.. i went to the junkyard n grabed a r12 sensor and got it installed now the condenser fan works.. it may just work.

[Rick]

All that the evaporator temp sensor does is cycle the compressor off if the evap gets too cold– that prevents it from icing up. Using the old sensor should be fine as long as it works. If it doesn’t work, then you will slowly lose A/C on hot humid days as ice builds up on the evap preventing air flow.

[Eddyg]

Cool thanks for the info..

[EricTheCarGuy]

It’s just a temperature sensor placed in the fins of the evaporator, it does not fit into the evaporator itself so there is no direct contact with anything inside the AC system, it’s placement on the evaporator is important but what is in the system R12 or R134a doesn’t matter.

[Author]

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