Question about 1991 Chevrolet Camaro

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My radiator fan will not turn so my engine over heats. I hooked the fan up to the battery direct and the fan runs. 305CI

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Could be the fan plug or the fan relay or possibly the sensor is bad & giving the computer the wrong temp.

Posted on Sep 11, 2009


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Dual radiator fans not working

Whats happening? Does it over heat? Does the heat work? If not over heating, does the engine run hotter than it did before you noticed the problem?

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1990 plymouth acclaim. radiator fan does not work. Radiator is holding fluid and pressure. runs fine at 55 mph because the air cools the engine> can not stop and go drive in city. Could this be a bad...

You can unplug the fan & put battery voltage to it

It is a dc motor & will run either direction depending
on how you hook it up

If it works then look on the radiator tank near the bottom
for a fan switch,will have a couple wires,will have to drain
coolant to remove

If you find one you can put in a pot on the stove & heat it up
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Jun 09, 2011 | 1990 Plymouth Acclaim

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The radiator fan does not come on when it heats up. I replaced the fan relay but it still does not come on. Do you have any ideas?


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.

Good Luck!! Don't forget to change this post!!

Aug 13, 2010 | 1992 Dodge Caravan

1 Answer

My engine over heated. Is there a problem with the thermostat housing or unit

Usually when an engine overheats it is caused by:

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.

Thanks for using FixYa!


Mar 05, 2010 | 2008 Mazda Cx 7

1 Answer

Have 95 saturn engine fan not running will idle

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.

Oct 13, 2009 | 1995 Saturn Sc

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92 Dodge stealth radiator coolong fan does not turn on. Where is the heat sensor and how do you check to see if it is working?

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

Sep 06, 2009 | 1992 Dodge Stealth

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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.

Mar 23, 2009 | 1999 Pontiac Grand Am GT

1 Answer

Cooling fan not working properly

Look at the fan radiator switch
Try unplug the CTS,if you see the radiator working continuously
Than the CTS, than change it

Jul 08, 2017 | 2005 Mitsubishi Endeavor

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Radiator fan is not working

Some toyotas have a coolant sensor NOT to be confused with the Temperature sensor. The coolant sensor is located on the radiator it selt, most likely on the bottom and close to the middle. Replace it and the fans should work as needed. Now a temporary fix, unplug the sensor, this will make the fans run only when the engine is running or the key is on the on position. Good luck.

Jul 28, 2008 | Toyota Corolla Cars & Trucks

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