I have just installed an aftermaket electric fan to replace the ditched clutch fan in my newly byb lifted 85 wagon. Thought I would re-establish funtionality of the thermoswitch. At what temp do these switches engage?

 

My rad is low miles and weather is cool, so car is running cool. I can watch the full sweep gauge show the therostat onening and closing. (sweet!) Fan never comes on, though I have not climed any grades.

 

Engine is running no hotter than 190 at this time. I also have the stock electric fan wired to a toggle.

 

I've read in the old posts that some guys rarely have the thermo-switched fan come on. Just in hot weather sitting in traffic.

 

Oh, and I have no air condidtioning.

 

Pyro

seems like the fan comes on right around 190, maybe a little hotter.

 

id check it sometime to make sure it is functional.

Did you install that full sweep guage in the radiator or in the intake manifold?

I mounted my guage in the intake. The fan kicks on around 215 and off around 195. I also mounted the sensor for the stock dash guage in one of the ports on the radiator and that shows the fan kicking on just above 5/8.

Did you install that full sweep guage in the radiator or in the intake manifold?

I mounted my guage in the intake. The fan kicks on around 215 and off around 195. I also mounted the sensor for the stock dash guage in one of the ports on the radiator and that shows the fan kicking on just above 5/8.

 

Sender for gauge is in manifold. Fan and thermoswitch work, yup around 215. The clutch fan never let it get that hot. Makes me kind of nervous. I'm considering getting an adustable thermoswitch. The outfit that made the fan, (can't remember the name, flex---something) make one that has a probe for the rad. Don't know if a setup like that is worth a crap or not. I now have two electric fans, so think I'll wire one into after market adustable probe, one into the stock thermalswitch, and have indicator lights for both, and and a bypass switch for one. I just hate to see it running up to 215 cause I'm not used to it. Guess it's not harmfull?

 

On a side note, i was suprised to discover that I can actually feel (seat of the pants) a slight increase in torque with out the mechanical fan. Nice!

 

PYro

Yeah, in really hot weather in town it doesn't take very long before it climbs to 230 even tho both fans are on. Out on the highway she runs more in the area of 215-220.