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What is make and model? How hot does the engine get in degrees F? Some radiator fans won't kick on till about 220 degrees F. Are you saying the radiator won't turn on at all? Some makes and models, if you unplug the coolant temp sensor, as a default setting, the fan will run all the time.
There could be other issues?
Apply 12v current straight to fan from battery to test fan motor, if it starts, then check the coolant temp. sensor, usually on or near thermostat housing. Also check for broken wires and loose connections.
1. In town driving and the fan switch on the radiator has failed and the cooling fan will NOT turn on. Check the fan by disconnecting the plug and applying power from the battery + and - to the 2 terminals/ The fan should run. If the fan runs only when you apply power from the battery and not while the car is running then the radiator fan switch is the prime suspect. It can be a fuse... or a relay but usually the problem is the switch itself. It screws directly into the radiator on the back side and will have 2 terminals on it.
2. The engine coolant thermostat located at the end of the top radiator hose is stuck closed. (Actually it is under the fitting the top hose attaches to on the manifold)
3. The impeller has falied inside the water pump housing. You can check to see if the impeller is working AFTER you have checked the thermostat. Fill the radiator with water all the way to within about 1/8 inch of the top of the radiator. On a WARM engine start the car and then rev the engine. You should see water flow inside the radiator.
No flow = bad water pump.
4. Engine Head gasket is leaking.
Pull the engine oil dip stick and see if the oil appears milky in color. If it does not look like oil and is milky then the engine head gasket has failed.
Also with the radiator cap off if you rev the engine and see quite a bit of water pushed out of the radiator then the engine head gasket has failed.
Those are all standard.. overheating problem checks. Hopefully the overheating incident has not caused other engine damage to your vehicle.
The engine fan is a 12 volt DC motor in a housing attached to the radiator. Unplug the fan and run two wires from the battery to the fan plug connections, if it runs the fan is good and you need to look next to the temperature sensor which tells the fan to turn on due to engine heat. If fan does not turn on with direct electricial connection then you can buy a replacement at advance, autozone, or on ebay motors. Note apply power to the fan's connector, not to the car wiring harness. If your fan is good I believe the there are two termperature sensors screwed into the driver's side of the engine head. They look similar but have different electrical connectors.
Look for the obvious first. Blown Fuse, Burned Fan Relay.
To test, disconnect the Fan plug in, run 1 x Pos. and 1 x Neg. of 12 or 14 gauge wire from the Battery, directly to the Fan Motor, and it should energise.
The Sensor for the Fan is on the Engine. This is a 2 contact threaded switch,which is Normally open, and make circuit contact copletion when the cooling system heats up, energising the Fan Motor.
This Fan should also operate when the A/c is in operation also, independent of the Coolant side.
[eg] When setting off, from home on a Hot day, the A/c is on , long before the Engine heats up
Regards, DT
did you bleed air out coolant. if you did check engine oil when engine cool .could have a blown head gasket. if it look like milk shake . head gasket leak . reason blow no heat check see heater blower motor working.if yes . heat control unit or heat door not open in dash vacuum line to heat door actutator could be leaking.
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