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Electrical fan not working ml 500 2001 model

Radiator fan not working

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Hi, i replace the thermostat and water pump flashed the radiator has coolant but still overheating, what else could it be its golf 4 tdi diesel 2002. Thank you

Radiator may have rust/salt deposits inside, if that is case its cheaper and better to change the radiator. Also for future don't use normal tap water in radiator, use a coolant + ph balanced water meant for radiators to reduce salt buildup inside radiator.

Also check the radiator fan is working ok and rotating in the right direction, sucking cool air inside not blowing out hot engine air to the radiator. Some electric fans can have wires mixed up so they start in the wrong direction. (make sure fan is sucking cool air outside towards the engine).

In some cars, radiator fan has a top cover that stops hot engine air getting sucked by the fan, if your car has it, make sure it is fitted properly and is in good order.

Some cars have a fan fitted on the AC condenser, make sure this fan is working as well.

Oct 01, 2016 | Cars & Trucks

2 Answers

If my radiater is patched and my car still over heats is it the fhermastat or radiater that needs replacing

I would start at the radiator
patching closes of cores and if it is old then there will be more blocked cores
you should mention the make year and model and if you have electric fans or viscous fan hub in you question

May 02, 2015 | Cars & Trucks

1 Answer

Replace cooling fan

Unfortunately you didn't say whether it is an engine driven fan or an electric fan.
The instructions for replacing an engine driven fan vary immensely but changing an electric fan is usually fairly straightforward if there is sufficient access. Generally the fan needs to be removed in assembly with the fan/radiator cowling and there usually isn't much holding it to the radiator but often access is so limited other stuff has to be removed.

Quite what will need to be removed will vary from model to model but mostly it is an intuitive process and few people who are familiar with the rudiments of vehicle maintenance will have trouble.

Jan 26, 2015 | Cars & Trucks

1 Answer

I have a 94 plymouth sundance 6 cylinder the fan that cools he radiator is not working what is he problem

3liter 6cyl? (5 or 6 engines used, 2.2L up to 3.8)
in all cases (engine rad cooling fan) (seems not)
clutch fan failure? (if old mech. type fan) replace it.
if electric fan?
  1. bad control sensor.
  2. bad controller
  3. bad fan relay
  4. bad fan
  5. bad wire/ connections between them.

what we do is get it hot and see if fan works at the FSM stated trip temperature. (225F is a guess, ) has this number too.
if the fan is dead, we check voltage the fan, 12v ? fan is dead.
0 volts? yes, then control is bad.
the work backwards from here, finding true cause. easy huh?
any cheap voltmeter made works .

the ECT is for the engine. EFI system. TBI?
but the Fsm states.
All models equipped with electric cooling fans use this sensor to control the cooling (radiator) fan operation.

i dont have the wiring set for this car.
try and use that for fan wiring ,etc.

Mar 12, 2014 | 2003 Suzuki Aerio

1 Answer

My 1995 camry is running hot. I have replaced the thermostat, hoses & radiator cap, but its still overheating when I stop for about 3 to 5 minutes. Any suggestions plz?

If your model has electric cooling fans they may not be turning on or reaching high speed. The fans work to boost cooling capacity when the regular water pump is not enough.

There are Relays for the fans and they get the signal to turn on from temperature sensors or setting a dash control.

If all switches work, fans, etc. then your Radiator or block may be clogged.

Jan 23, 2013 | Cars & Trucks

1 Answer

Why does my cadillac deville heat up

If you look by the Radiator there will be an Electric fan motor. This Radiator fan may have 2 speeds. When the A/C is turned on, it will turn on at least low speed. Otherwise Water Temperature sensors make it work and spin to cool the Radiator.

You need to have this circuit checked. You need to find out if the Electric fan is any good and if both speeds work. The sensors for the fan may not be turning it on or may not be turning it on with High speed. Some Models have a Water Temperature sensor and some have a second sensor just for the Water gauge.
You need to investigate just the part that turns on the Electric Radiator fan.

There may be fuses for the Relays which operate this Radiator fan. The Relay that gets the signal from the sensor may not be working either.

While it sounds like a lot of parts, it makes sense when you know why the parts are there. A Temperature sensor turns on the Relay which has the strength to connect and maintain power to the Electric Radiator fan and operate the multiple speeds. If a fuse breaks, there is a bad part in the system. Just replacing a broken fuse will not fix the bad part.

You need to trace down the bad part and get it off your car. If you already have paid a shop and the car is not fixed, then they should investigate what I am writing to you. Morally, they should continue to test your car for the money you paid to keep it from overheating.

The parts you put on it already will not hurt and could have been part of the problem. Now you need to get the rest of the problem fixed.

Nov 12, 2011 | 2001 Cadillac DeVille

1 Answer

Cooling fan burned up

Get a new fan motor and blade from GM or from an aftermarket supplier.

GM parts are usually better than the aftermarket ones, though for fit and functioin.

May also look into checking the relays and harness. If the terminals of the fan show they are getting current, then the motor will have to be replaced if not turning or obviously burnt.

Good luck on this repair.


The fan that draws cool air across the radiator can be driven by either a belt or electricity. Rotating fans can be dangerous. Some are controlled by an automatic switch and can start unexpectedly. When working on electric fans, keep in mind that electric cooling fans should be disconnected when working around them.
When replacing a radiator fan motor, always refer to the vehicle's service manual. The following is a general guide for cooling fan replacement.

  • Disconnect the negative battery terminal at the battery. This is necessary on vehicles using electric fans, but some vehicles may require the relocation of the charging system components.
  • Drain the cooling system.
  • Loosen or remove the hose clamps, then remove the upper and lower hoses from the radiator.
  • Disconnect the transmission cooling lines and plug them off, if equipped.
  • Disconnect the electric fan motor connector, if equipped.
  • Remove the fasteners attaching the fan module to the radiator.
  • On some vehicles equipped with air conditioning systems, it may be necessary to discharge the system. This is the case if the radiator and condenser can not be separated in the vehicle.
  • Remove the upper radiator cross member or mounts.
  • Disconnect and plug the air conditioning lines at the condenser, if needed.
  • Remove the radiator and fan module as one unit if possible.
  • Separate the fan module from the radiator.
  • If required, separate the radiator from the condenser.
  • Remove the old fan module.
  • Install the new fan module onto the radiator.
  • Reattach the fasteners attaching the fan module to the radiator.
  • If equipped, connect the electric fan motor connector.
  • Reinstall the radiator.
  • Refill the cooling system.

Oct 29, 2010 | 1997 Chevrolet Cavalier

1 Answer

Electric fans do not work do you have any ideas my car runs very hot fans never seem to come on

Electric radiator fans? Just a guess but it could be the water thermostat. They are very inexpensive but you may have to drain and refill the radiator. If the water will not flow though the radiator it will not cool the engine. This is the function of the thermostat which is inline to the water pump and allows the engine to warm up before cooling through the radiator then when the fan thermostat on the radiator heats up the electric fans will run. You might be able to squeeze the upper radiator hose to feel if pressure is building up or water is flowing.

Jul 14, 2009 | 1991 Oldsmobile Cutlass Calais

1 Answer

Radiator fans not working

Check your connections on the fan. There are electrical plugs on the fans that connect to your cars electrical system. Check this, especially if you just put in a new radiator.

Mar 23, 2009 | 1992 Dodge Dynasty

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