Quote:
Originally Posted by pfarah
So, here's the situation...
The resistor reads 1.9 ohms.
The AC fan relay tests fine, the other fan relay is new.
Both fans run on high when the ac is turned on and when the operating temp is getting close to hot.
The driver's side fan does not turn on when the radiator switch is jumper-ed.
Why does the driver's side fan not turn on low? I've already looked into Clark's Garage; maybe I'm missing something and appreciate any insight.
Hope everyone's Christmas was great! I didn't touch the car today at all and feel a little guilty...
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Sorry to dig up this old post. It may have been solved a decade ago many times, but I think I now understand how the cooling fan circuit works for EARLY cars (contrary to Clark’s Garage description). I have done all of the testing outlined and I believe that my system is working as designed, including my fan resistor puck which was the original subject of this post (and very helpful for me to find it).
With the key on and/or engine running and the coolant temperature hotter than the thermofan switch set point on the radiator (just below the radiator hose connection), both fans will run on high speed until the temperature cools below the set point of the thermofan switch. Both fans will also go on full speed when the air conditioning is on.
When the key is off and the temperature is higher than the thermofan switch set point the driver’s side (left) fan will run at slow speed until the temperature cools below the set point. This may not happen often so it is hard to observe unless you turn off the car before the 2 fans on full speed have done their job.
I am so grateful for all of Clark’s Garage content. I wish he was still around so I could thank him for all his amazing work. I am sure he would be open to a small edit in COOL-01.
If I am out to lunch and my driver’s side fan should run before the 2 fans come on at full speed, then I still need help figuring out what is wrong. Thanks!