I have a 97 dodge grand caravan that has a cooling fan problem. I have replaced the fans, radiator, col temp sens, fan relay, fuses and the fan still does not come on. i did notice the previous owner cut into the fans power wire and ran it to the radio fuse under the dash. I disconected that and reconnected stock wiring now my ? is do i need to flash my cpu for the fans to engage?

Dodge Caravan Radiator Fan Not Working Chrysler Town and Country Radiator...

code 35-Radiator fan control relay circuit-open or short detected in the low speed radiator fan relay control circuit.

improper coolant level, temp sensor not turning elec fan on. elec cooling fan failure.

the usual culprit is a bad relay. Some cars have 2 or 3 cooling fsan relays, usually under the hood in a fuse/relay box. Look in owner manual for fuse/relay locations and pull the cooling fan relays one at a time & see if it cuts off. That could be the bad one. The engine computer usually controls the fan motor based on input from the coolabnt temp sensor or by when you have the heater controls set on a/c or defrost modes.

HOT WIRE COOLANT FAN. STILL DONT TURN ON REPLACE FAN ASSEMBLY. IF COOLANT FAN DOES TURN ON WHEN HOT WIRED.CHECK THE FAN RELAY OR FUSE ALSO SCAN VECHICLE FOR FAULTY COOLANT TEMPERATURE SENSOR IF ENGINE COOLANT TEMPERATURE IS 190 DEGREES AND SCANNER SHOWS 80 OR LOWER COOLANT TEMPERATURE SENSOR FAULTY.

If you have checked the relay module under the fans,on drivers side,and they are fine,replace the coolant sensor,and make sure all the air is bled out of the cooling system.

The fans are actuated by coolant temp in the radiator. It is possible to have overheated coolant in the radiator, causing the steam, and your engine not overheating...the temp sensor for your engine is reflecting the engine temp, not the temp of the coolant in the radiator. You problem could be a bad temp sensor at the radiator...not allowing the fans to come on. Good Luck! I hope you find this to be very helpful!

First is your engine getting up to temp? if not check for a stuck open thermostat. Second with engine up to temp (where fan kicks on) check for voltage at the fan, If 12vdc present replace fan, If 0vdc present check fuses and relays.

the cooling fan relay is not in the fuse box.

it is a solid state relay bolted to the radiator core support just behind the bumper

check for battery power at pin 4 of rad fan relay connector..ground at pin 1..jump pins 3 and 4..fans should work..if not,check harness about 3-4 inches away from relay connector..have seen these corrode..if fans work,the engine controller may not be grounding relay..any codes in engine controller?engine light on?