HELP! Cooling fan not working

[3.0Duster]

my car started to overheat alot about a week ago and ive noticed that my radiator fan nolonger turns on, i tested the fan and it works fine, how do i fix this, could it be the sensor? thanks

[22dodge]

Ideally a scan tool would really help. I recently bought a 1992 grand voyager ($150) that over heated and had tons of parts thrown at it...New radiator, new cooling van, new water pump and thermostat. so I hooked up my snapon MT2500 and activated cooling fan relay... relay clicked, no fan. did a little RTFB (read the factory book) and found that there is a fuseable link in the system.... found the fuseable link wires and sure enough one was fried. spliced in a new fuse wire (actually a used one from a junk car) and it works great... ended up selling the van 3 months later for $1000 pretty good turn around for a free wire and 30 min of work.

I would recommend trying this. start the car and then disconnect the coolant sensor, this will energize the cooling fan circuit. see if the relay clicks. if so use a test light or multimeter to check for power out of the relay (check power into relay also) there will be 2 hot wires with the key on. one hot wire at all times (this wire is the power feed from the fuse link). try jumping hot wire to fan wire to check for circuit power. check relay... energize relay and check for continuity across the fan power circuit...theres just a few things to try

[3.0Duster]

thanks ill give that a try, just so you know i have a 90 shelby daytona vnt, not a 3.0 duster, thanks

[22dodge]

when you disconnect the coolant sensor (this is the sensor in the head by the thermostat upper radiator hose...not the single wire sensor near the 2nd spark plug) the car will go into "limp-in" meaning it eliminates computer controled timing advance, and automaticlly energizes the fan system.

[3.0Duster]

tried that, fan doesnt turn on thou

[ShelbyMotorspts]

First thing I do is to disconnect the coolant sensor like you do when you are setting the timing.

If the fan doesn't turn on take a screwdriver and using it's handle tap on the fan relay mounted usually on the fender.

If it still doesn't turn on unplug the fan motor pigtail conector and hook 12v power and ground directly to the fan.

If it still doesn't turn on you have a bad fan motor. If it does turn on you have a wiring problem and need to start tracing/checking the fan wiring backwards from the fan motor to the fan relay. and on and on until you find the break in the electrical circuit.

Steve