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my car usually stays at about 210 most of the time. i turned the manual fan switch on today and my car stayed there. wouldn't move at all. i've also been having this problem: everytime i turn on my a/c the car starts getting hot. turn off the a/c, car is fine. i'm wondering if my high speed fan is working. i mean, with the car off and key on, i can flip the switch and hear the fan come on. so i don't understand. anyone have any good ideas?
 

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If you do the KOER (Key On Engine Running) Test, it will test your fan low and hi speed. I don't know if it will determine if your ECT sensor is working, which tells your computer when to turn the hi fan on.
 

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That's strange, I just installed my manual fan switch last week and with the temp gauge over halfway, I switch the fan on and within 90 seconds it lowers it down near the "N" on the guage. I have to keep the fan on if I want it to stay that cool, but usually only in traffic on hot days.
 

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You can get all types on switches at radio shack or an electronics store. I just used a switch from work that lights up red when the fan is on. I pretty much leave mine on all the time. Should I only be using it in bad traffic or will it not hurt anything to constantly run?
 

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Thanks! Can you tap into the wire withing the passenger compartment or do you have to go directly to the fan? If the earlier, which wire is it?
 

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