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ac fan
- Thread starter DubbyDoo
- Start date
- Location
- Southern Maryland
What year vehicle?
joe_peters
NAXJA Forum User
- Location
- Grants Pass, OryGun
BASICS--Year/engine/etc.
Depends on the year. There is either an aux fan switch mounted in the radiator, or a dual purpose CTS in the thermostat housing. Depending in the year, the aux fan either runs anytime the a/c is on or it is entirely controlled by the PCM. Different years have different temperature thresholds in the sensors depending on where they are physically located in the cooling system.
Depends on the year. There is either an aux fan switch mounted in the radiator, or a dual purpose CTS in the thermostat housing. Depending in the year, the aux fan either runs anytime the a/c is on or it is entirely controlled by the PCM. Different years have different temperature thresholds in the sensors depending on where they are physically located in the cooling system.
joe_peters
NAXJA Forum User
- Location
- Grants Pass, OryGun
Ok, 94 means the CTS in the thermostat housing provides data to the PCM, the PCM controls aux fan operation based in its pre-programmed routines. I think, but not sure, that about 217 degrees and the PCM turns the aux fan on. I'm not 100 percent, but I believe on your 94 the aux fan still runs anytime the a/c is turned on.
- Location
- Southern Maryland
One immediately obvious con would be losing the fan when A/C compressor clutch is engaged. You also run a slight risk of overcooling the engine.
I want some of that overcooling the engine...
It might help if you told us what your problem is and what you are trying to accomplish.
I assume that you are referring to the auxiliary electric fan as the "ac fan". I added an aftermarket temp switch (Hayden with a radiator probe) to my '93 about four years ago but wired it in parallel with the existing wiring so the fan still comes on whenever the ac is on. Works fine.
It might help if you told us what your problem is and what you are trying to accomplish.
I assume that you are referring to the auxiliary electric fan as the "ac fan". I added an aftermarket temp switch (Hayden with a radiator probe) to my '93 about four years ago but wired it in parallel with the existing wiring so the fan still comes on whenever the ac is on. Works fine.