Radiator fan not operating
#1
JK Newbie
Thread Starter
Radiator fan not operating
I have a 2010 wrangler 3.8 that the radiator fan only comes on when the A/C is on. Tested the fan it was fine and replaced the relay. I also get two codes, P0128 thermostat rationality and P0693 cooling fan control circuit low.
Can anyone help?
Can anyone help?
#2
JK Jedi
Listen, I can't help with this issue, but I'll tag @ronjenx who might be able to help with this electrical issue if you'll kindly stop posting this same thread in different sub-forums. You just posted it for a 3rd time in the Write-Up section.
#4
I just changed my ECT (engine coolant temp) sensor on my 2010 as a preventive maintenance against possible failure sending a signal to turn the fan on. The original was black plastic, the new revised version is brass and more robust. BTW, I did this after reading a post by MoTech explaining their experiences.
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Robert Roth (01-08-2019)
#5
Super Moderator
if the fan is coming on when the AC is activated, that means you are getting the high-speed side of the circuit. Besides the relay (behind the driver headlamp) there is a voltage divider (down by the blower motor) that can fail. If this fails, the LOW speed will not work. Kinda sounds like this may be your case.
#6
JK Newbie
Thread Starter
You are talking about the high low resistor on a 2010 3.8, it's located on the fan shroud and I changed that second. I have changed the relay already now I'm going to change the coolant sensor as soon as it gets in.