Question about 1998 Oldsmobile Silhouette

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Cooling fan's dont come on at all, fans work when hardwired. Relay's test good, Thermal sender replaced. I'am out of posibilties at this point with trouble shooting. Please help!

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The fans will not come on until 225 degrees. Be sure you have the correct relay. The fans should come on when the ac is running.

Posted on Jun 15, 2009


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Im having probs Vauxhall astra 1.6 11 plate cooling fan on all the time

the fan power is controlled at the last point by a relay
that relay gets the signal from the ECM which relies on the coolant temperature sensor to report on coolant temperature and the need to cool it down
If there is a problem in that relay ( points burnt together then the fan will run continuously as the power is direct from the battery
first fix is too replace that relay with a known good one and if it still runs then you will have to trace back each component and fuse until you find the faulty unit
It could possibly be a faulty coolant SENSOR ( don't confuse with a coolant sender which works the gauge)

Aug 11, 2015 | Vauxhall Cars & Trucks

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Both fans dont work

are these the rad cooling fans ? for both to stop working i'd say it's the temperature sender switch , to test pull off the wire from switch and earth it , if the fans start then the switch needs replacing

Jul 12, 2014 | 2000 Mitsubishi Eclipse

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Still have fan problem

The way the system works is the thermal switch, or temp sender sends a signal to the computer, the computer sends a signal to the fan relay and the relay then sends power to the fan motor. If you have verified that all of the components in the system work properly then that leaves you a connection problem. Time to make some jumper wires and use a multi meter to ohm out wires and connections and find the problem. Make sure to check your grounds too, if you are putting power to the fan motors and there is no ground there is not completion of a circuit and they will not run.

May 28, 2013 | 2002 Chevrolet Malibu

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Overheating: cooling fan won't ingauge

I would first check the fan relays make sure they are good ..If no problem there then i would disconnect the wires going to the cooling fan..turn on your a/c ..that should activate the fan even if the vehicles cold ..see if you have voltage across the wires plug the meter right into the wire you should have 12 volts..if you do then its the fan..if the fan comes on during a/c but dont come when vehicle gets hot,then its probably the temperature senser that tells the fan to come on..Its located near the thermostat.

Sep 04, 2011 | 1995 Mercury Sable

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Electric radiator fan wont turn on . but when fan is jumped with 12 volts fan works

heres a little test start vehicle turn a/c on high in the defrost position your fan should start if so than test hi low fan relay and replace coolant temp sender not sensor in some cases replace both thank u have a good day.

May 04, 2010 | 1999 Jeep Grand Cherokee

1 Answer

89 buick lesabre electric cooling fans

You are off to a good start by testing the fans. Get a repair manual from your nearest autoparts store. I find them invaluable. Most temperature sensors can be tested with an Ohm meter. Or short the two wires together to trigger fans. If it has only one wire then ground it to the frame/body (negative side of battery). If none of that works (with ignition on / car off) then relay is bad. Also turning on the A/C should make the fans come on. Car does not have to be running, key in on position. This would eliminate bad relays or not.

Mar 04, 2010 | 1989 Buick LeSabre

2 Answers

The engine is overheating and the fan doesn't appear to be operating but turns freely by hand. Is there a test point or sensor location?

This is the easiest way to test. Unplug the fan and direct wire to the battery and see if it comes on. If the fan comes on it is good, go to the relay center and make sure the relay is good. There should be another relay right next to it that is identical to it swap the two out and see if it comes on then when it gets hot. If it does and the item in which you swapped the relay from does not work then relay is bad replace it. Also check the cooling temperature sensor mounted near the thermostat housing if this goes out the fan will not kick on.

Oct 05, 2009 | 1990 Chevrolet Beretta

1 Answer

My saturn over heats only when i have the ac off

Check for a fuse that is blown first.Then look for a cooling fan relay.Check the relay to see if it will turn on the fan,by using a test light.Clip the end on the test light to a good ground,maybe the ground on the battery.While the car is running,pull the fan relay out just a little so you can touch the prongs on the relay with the test light pointed end.When you touch the right prong,the fan will come on.The test light is actually grounding the relay.This is the safe way to activate the relay without damaging the relay circuit.If the relay clicks,and the fan comes on,replace the coolant sensor.If the fan does not come on,and the relay clicks,then run a hot wire to the positive wire on the fan to see if it will work.If you don`t get the fan to run that way,and you are sure the fan is hooked up correctly,then replace the cooling fan.If you cannot get the relay to click,and the fan is good(because you have checked it)replace the relay.If I can help,let me know.

Aug 30, 2009 | 1995 Saturn Sl

2 Answers

I have a problem with my Mazda xedos 1995. The car keeps overheating and the fan does not kick in. Does anybody have any advise on how to check the fan and how to get it started again. Thanks in advance

Remove the fan sender unit wire which should be around the cylinder head the best way to locate it is to go by the wiring frm the fan to the sender unit.
Ones found , switch 'on' the igntion and then pull the wire from the sender unit , the fan should come 'on' there. if not thn the fan could have gone, probabely it could be the brushes inside, the best way to do is to replace the complete fan assy.

You can also check the fan by disconnecting the wires from around where its fitted there must be a connector, remove the connection and get two wires and connect it to the fan wiring and the others to the live and negative if the battery, the fan , if it' s ok should roar here, if the fans ok then the sender unit maybe faulty, you will have to replace it.
Good Luck.


May 06, 2009 | 1996 Mazda Millenia

1 Answer

Radiator cooling fan doesn't come on.

first unplug the cooling fan at its plug and supply 12v to the fan if it doesnt run then replace if it does run follow the power wire to the thermal water switch usualy located at the bottom of the radiator.Use test light/probe to check that you have power into the switch and when engine is hot you should have power both in and out of the switch.if not replace thermal water switch.If that is working you will need to find out why you have no power to the switch.Check that your fuse and relay is working correctly.Sometimes just pulling out the relay and putting back in will make it work due to poor contact.Also try swapping relays with others in the same box near battery to identify if relay is faulty

Oct 27, 2008 | 1990 Buick LeSabre

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