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Car runs hot until fan kicks on happens all the time

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It could be the temperature sensor close to the thermostat...

Posted on May 21, 2011

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Posted on Jan 02, 2017

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SOURCE: our 95 honda accord ex is running very hot. The

did you try venting the system, sometimes air can cause that, or make sure you are getting flow through the system for example it could be the thermostat that is stuck shut or it could be the radiator is clogged, or maybe there is not enough coolent. another problem maybe your temp sensor is bad...

Posted on Feb 21, 2009

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Cooling fans kick on for a few seconds then cut off


The fan should work off of the water temp. The fan will come on and off to keep the constant temp on the cooling water. If equipped with a second fan it is probably for the AC and will run when the A/C is on. If you think the fan should be on. Then If you know where the fan relay is check to see if it is hot, if real hot the relay may be going bad. Hope you know this when you turn the car off the fan can still come on if the water temp is to high. My thought fan going bad, temp sensor or relay may be the problem.. If you can touch the fan motor metal housing and it is real hot the fan man be going bad, remember the blades can start at any time.

May 01, 2016 | 1999 Oldsmobile Aurora

1 Answer

SS w/3.8l engine. What would cause the first electric fan not run but when temp rises the second fan will come on?


The coolant fan should kick on when temp reaches 192 degrees. Have you changed your thermostat? The 2nd fan is for the a/c. If car is running hot, it's probably thermostat or cooling fan

Apr 05, 2016 | 2001 Chevrolet Monte Carlo

1 Answer

My 1998 lexus e300 is running hot and I noticed the cooling fans are both running but at low speed. what controls the fan speed


The PCM(computer) controls the fan speed. Low speed comes on around 200 degrees, high speed kicks on at around 225 degrees. If they come on when you first start the engine, the coolant sensor is bad. PCM is in default mode and runs the fans all the time. Since it doesn't read the 225 mark, it won't kick on the high speed. Turning on the A/C will also kick on the high speed fans. That's if your A/C works.

Jun 21, 2015 | Lexus Cars & Trucks

1 Answer

My engine coolant temperature switch not turning on fan relay until car runs warm above normall. I replaced temp switch I can make fan relay kick on fan by jumping the two wires together that run to temp...


Year make and model ?
Did you get all of the air out of the cooling system when you filled it back up ?
The fan is supposed to come on at 220 degrees.

Jul 29, 2012 | Cars & Trucks

1 Answer

Engine Cooling problem 1991 Toyota Camry 4 cyl


The cooling fan is controlled by a temp switch in the bottom of the radiator, try6 replacing this switch.

Apr 03, 2017 | 1991 Toyota Camry

1 Answer

Fan doesn't run while in idle and begins to over heat until I start driving agin then it cools back down to normal. Also the fan runs when engine is off and drains the battery.


The fan is only supposed to come on when there is excess heat .. in normal driving conditions it doesn't start. When you start your car in the morning the fan won't come on because the engine is cold.

With a hot engine - and it depends how hot the engine is - the fan will only kick in to prevent overheating. In heavy slow moving traffic or a traffic jam, the fan will kick in if needed.

The air flow through the radiator is usually sufficient -in normal driving conditions - to cool the engine.

When you park up and the car has a hot engine, the fan will kick in. This is perfectly normal. It is caused by a surge of hot coolant triggering the fan sensor. Perfectly normal.

The fan then should cut out after a while .. maybe 2-3 minutes at the most. If the fan runs continuously that suggests a fault in the temperature sensor switch.

Next time - wait by the car and see how long it takes for the fan to quit after you have parked up. It should stop of its own accord after a couple of minutes.

If the fan cuts off after a short while, and your battery is becoming drained, that's probably a battery or alternator fault.

Remember: when you start the car the fan won't kick in at idle speed because the engine is COLD, and there is no reason for the fan to start up ..
The fan WILL kick in for a couple of minutes after you have parked the vehicle and the engine is hot

Aug 14, 2010 | 1999 Jeep Grand Cherokee

1 Answer

I have a 84 351 windsor that runs way to hot i put


seems to me that you could have an air lock, try loosening the rad cap slightly and run car until fans kicks in, squeeze upper rad hose a few times to push any air out. Careful with hot hoses. see if this helps.

Apr 27, 2010 | 1991 Ford Mustang

1 Answer

Car runs hot


If it was the thermostat, it would run hot all the time. Sounds more like the electric cooling fans are not working. Either the fans themselves are not working, or the coolant temperature sensor is bad and not sending a signal to the computor to turn them on. Have the fans checked first, then go for the sensor if it isn't the fans.

Apr 11, 2010 | 2003 Chevrolet Impala

1 Answer

2000 Plymouth Voyager Overheating


cOOLING fAN tURNS ON @ 210-230 dEG. tEMP sENSOR bAD & OR fAN relay cAN cAUSE THIS pROBLEM

Jun 02, 2009 | 1998 Plymouth Voyager

1 Answer

Engine temperture runs hot after idling or waiting in traffic for an extended period of time perhaps 10 minutes


Sounds like your cooling fan may not be kicking on. Start the car in the driveway and just let it run with the hood open. When the engine starts to heat too much, the cooling fan should kick on. If it doesn't, it could be a fuse, a relay, a temperature switch, or the fan clutch itself.

Aug 10, 2008 | Jeep Cherokee Cars & Trucks

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