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Engine fan comes on normally when cool. In traffic the temperature gets too hot before coming on

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Change the thermostat,

Posted on Nov 02, 2012

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3 Answers

Radiator fans do not come on unless A/C is on


Radiator fans come on only when engine reaches certain temperature or AC is switched on.

May 10, 2016 | 2003 Buick Park Avenue Ultra

1 Answer

1994 Chrysler Lebaron Convertible In traffic with


If the cooling system is functional, yes.
The ac condenser adds heat to the air coming thru the radiator when the ac is on. If the engine cooling system is weak, the extra heat will make the engine run hot.
Low coolant flow thru the radiator is a common cause.

Sep 01, 2013 | 1994 Chrysler LeBaron

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Engine cooling fan only works when ac or defrost is on


if engine at long stand still,the engine temperature will rise about 190 degrees the cooling fan suppose to automaticaly turn on when coolant temperature sensor get hot it cause its resistance decrease causing pcm to send power to coolant fan relays and cooling fans, when you turn on AC the cooling fans suppose to turn on to cool down AC CONDENSOR, IF NOT AC WONT WORK COOLING FAN COOLS DOWN REFRIGERANT SO IT CAN RECYCLE THROUGH THE SYSTEM AGAIN.your cooling is suppose to turn on when engine at a sit still if vechicle not moving as coolant temperature rises at a set point the cooling fans will turn on cool down engine.cooling fans dont turn on when you first cold stsrt vechicle unless you have AC SWITCH ON.if cooling fans dont turn on when vechicle at a long stand still or moving along slow traffic.if coolant temperature sensor been replaced and fuses and relays okay have dealership check see if pcm driver circuit working faulty pcm will cause cooling fans not to turn on.

Sep 27, 2012 | 1996 Buick Century

1 Answer

Mini Cooper temperature gauge goes to red zone when idle


check coolant level could be too low allowing air in the cooling system causing air pocket in engine around the engine coolant sensor.coolant sensor needs to be in hot coolant so it will cause the cooling fan to come on at a set temperature.make sure coolant correct level and the coolant level in the cooling overflow jug should be at full cold mark.the cooling overflow jug should never be empty,if you see empty cooling overflow jug air got in the cooling system so make sure when engine cold every time raise hood make sure cooling overflow jug coolant level at full cold mark.if jug stay empty you have cooling leak.so replace radiator cap,if coolant level all good,i would replace the engine coolant temperature and thermostat.when your car come to a long stop or driving along long line of slow moving traffic the engine coolant blower motor should running if not have vechicle code scan for faulty coolant fan motor control module.or ecm problems.

Sep 01, 2012 | 2005 Mini Cooper

2 Answers

Engine fans come while driving then after a little while they go off and that happen every so often.


This should be normal operation of the fans they do not run all the time as most people think as the engine temperature increases the fans will come on to help cool down the engine once the temperature decreases then the fans will cut off and it will continue to cycle that way there is nothing wrong with that its normal. You will notice however that when you turn on the A/C the fan will turn on and stay on till you turn off the A/C this is also normal some vehicle have two fans one for the A/C the other for engine cooling unless your engine is getting too hot then they will both come on but normally one is for the engine cooling the other for the condenser A/C and this one will only come on when the A/C is running.

Dec 23, 2010 | 2004 Lincoln LS

3 Answers

Coolant temp rise to around 210 degrees when idling or in stop & go traffic bur drops back to around 196 when cruising. Is this normal?


completely normal those readings are perfect this car comes with a 195 degree thermostat,210 is fine for stop a go traffic remember a cooling system with the proper amount of coolant in it and under pressure will not overheat till about 240 degrees your in great shape no conerns!!!!!...

Sep 01, 2010 | 2006 Chevrolet Corvette

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

When idling my jeep overheats. The cooling fan is running and it speeds up when temperature goes up. The temperature gets close to 260 degrees and the engine tries to stall. when I start moving it cools...


At idling speed an engine does build up a lot of heat and the cooling fan will kick in. In slow moving traffic or traffic jams the temperature gauge can touch the red - particularly on hot days. The reason it cools down when you start moving is because of the air flow through the radiator.

Presumably there are no leaks from the cooling system otherwise you would have mentioned it. In normal circumstances the fan will not be running as you are driving at speed, as the air-flow through the radiator is sufficient to cool things. The fan only kicks in to get rid of excess heat - and this usually occurs at idling speed or after you have parked the car.

If the fan is running all the time as you drive, this points to either a fault in the fan switch, or the car is running too hot. presumably in normal driving the fan isn't running and the temperature gauge reads normal?

It is common - in stationary traffic many cars overheat (particularly big engined models) try to stall and 'cut out'. Restarting can be difficult until the engine cools down.

Is your car overheating in normal driving conditions or just at idle speed? Overheating in normal driving conditions can be caused by things like a failing water pump, blocked radiator, collapsed hose, faulty thermostat or, in the worst case scenario, cylinder head problems.

Overheating at idling speed is 'common'. Check your coolant level. If your car isn't using/losing coolant then there probably is no major problem. You can flush out the cooling system and refill with new coolant - and also check your radiator. Are the cooling fins crumbling with age? Or maybe they're partly clogged with insects and debris from the road? A blast with a hosepipe wil sort that out ..

The question is how much does your car overheat in normal driving? If it doesn't .. it appears as though you have nothing to worry about as such. Most cars have 2 speed fans... the 2nd faster stage kicks in at some point dependant on engine temperature. Perfectly normal.

Aug 14, 2010 | 2003 Jeep Grand Cherokee

2 Answers

The car overheats only when sitting in traffic. The temperature will rise to 220 then drop to normal after the car starts moving. The temperature remains normal at all other times and conditions. The...


Hmm.. That is VERY tipical of a fan not working.. Maybe its ot working propery..
Could be the thermostat..

Next time you pull into your driveway --
let it idle in park.. Open the hood.. See how long it takes for the fan to come on.. See if the temp goes way up before the fan comes on..

Hope this helps !!
Please rate me good ;o)

Sometimes when these fans go - it wont spin as fast as it should or as long as it should..

Jul 10, 2009 | 1999 Oldsmobile Aurora

1 Answer

1996 buick regal over heating


Hi,
This sounds normal to me..... Except "runs to hot when idling"

When you're driving about (airflow over rad) all seems fine, but when sat in traffic idling - the fans come on to cool. Is the problem that even with the fans running, temperature still goes up - and fans never turn off again?

Is this the problem?

If it is, then the coolant pump may be badly corroded, not driving efficiently, or the coolant needs flushing and replacing.

Jun 15, 2008 | 1996 Buick Regal Olympic Gold

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