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The car's overheating due to the fan not kicking in but if you switch the air con on the fan runs. Where do we check for the problem?

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Most vehicles have two fans. One for the a/c condensor and one for the radiator. They sometimes work together. I would start with checking the fuses, relays and the fan itself. What kind of vehicle is this on?

Posted on Jul 14, 2010

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Radiator blew due to cooling fans not working, replaced radiator fans will not run unless I turn on ac or pull run rly fuse what is going on?


Check the sensor in the bottom of the radiator is connected and working.The water has to get hot before they come on near boiling point,the air con switch over ride s the normal sensor.

Oct 01, 2016 | 2007 Chevrolet Uplander

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We have a 2002 Chevy Malibu.. And the fans want run to keep the motor cool.. When the motor get too hot the car will shut off.. So, what do I do about it??


First check fuses, there are two fans if fitted with air con. The air con. fan only comes on with the air con. The engine radiator cooling fan comes on at operation tem., it is controlled by a censer switch on the radiator .If there is power to the switch and the switch is OK the fan motor is at fault.

Aug 10, 2014 | Cars & Trucks

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Nissan qashqai 2 l 2009 overheating when air condition turned on


there are two cooling fans one comes on when the motor reaches operating temp , the other fan must come on as soon as the air con is switched on , if not the engine will over heat.

Jul 06, 2014 | 2008 Nissan Qashqai 1.5

1 Answer

Cadilac deville 2001 runs hot when you get into stop and go trffic.


The most common overheating problem with the Northstar engine is a blocked purge line(small hose).The purge line is designed to purge air out of the cooling system.
There is a small diameter hose coming from near the top of the coolant tank (not the cap) ,this is the purge line.
With the engine idling,pull the purge line from the tank,if there is no coolant flow from this small hose,it is blocked and this will cause overheating.
If the hose is clear, check for blockage at the nipple on the tank.Or trace the hose back until you find the blockage.
The hose goes in to the engine to a crossover and comes out the other side close to the thermostat housing,the blockage may be there.

Also note that the cooling fans don't come on until the coolant temperature hits around 225 degrees.
During normal highway driving the fans will very rarely come on(if at all) due to constant air flow through the radiator.They will only usually come on in heavy traffic conditions on a hot day.
But......if you have the Air Con switched on, the fans will run all of the time.


Jul 02, 2010 | 2001 Cadillac DeVille

1 Answer

Engine overheating in 1999 Cadillac Deville. Cooling fan not coming on but does kick in when A/C is on. This is my Mom's car and I need help


The most common overheating problem with the Northstar engine is a blocked purge line(small hose).The purge line is designed to purge air out of the cooling system.
There is a small diameter hose coming from near the top of the coolant tank (not the cap) ,this is the purge line.
With the engine idling,pull the purge line from the tank,if there is no coolant flow from this small hose,it is blocked and this will cause overheating.
If the hose is clear, check for blockage at the nipple on the tank.Or trace the hose back until you find the blockage.
The hose goes in to the engine to a crossover and comes out the other side close to the thermostat housing,the blockage may be there.

Also note that the cooling fans don't come on until the coolant temperature hits around 225 degrees.
During normal highway driving the fans will very rarely come on(if at all) due to constant air flow through the radiator.They will only usually come on in heavy traffic conditions on a hot day.
But......if you have the Air Con switched on, the fans will run all of the time.

May 26, 2010 | 1999 Cadillac DeVille

2 Answers

The cooling fans wont kick in and its boiling


The most common overheating problem with the Northstar engine is a blocked purge line. It's job is to purge air out of the cooling system.
If the purge line is blocked you may have an air lock preventing coolant flow.
There is a small diameter hose coming from near the top of the coolant tank,this is the purge line.
With the engine idling,pull the purge line from the tank,if there is no coolant flow from this small hose,it is blocked and this will cause overheating.If the hose is clear, check for blockage at the nipple on the tank.

Air locks in the Northstar engine shouldn't be a problem as the system is self purging, providing all the hoses are clear.

Check the coolant level in the tank,it should be half way when cold.
There is no cap on the radiator as it is a fully pressurized system.

The expansion tank is the only means by which to add coolant to the Northstar engine.

Check to see if your fans are working by switching on the air con,they should run all the time.

With the air con off,the fans won't come on until the temp hits around 225 degrees.

Also, if it's boiling over, the cap on the expansion tank may not be holding pressure and therefore needs replacing.....a new cap only costs a few dollars so it is worth replacing to see if this solves your problem.

Oct 09, 2009 | 1998 Cadillac Seville

4 Answers

1996 Cadillac Deville- running hot


is the water pump, belt and tensioner OK? its not where you think it is. its on the drivers side of the front cylinder head.

Oct 03, 2009 | 1996 Cadillac DeVille

1 Answer

Overheating, not pulling from overflow??


Hi, i'm going to ask if you've checked the fan clutch? with the engine running, do you feel a strong wind flow coming from the fan when you stand near it? If the fan clutch is not engaging, and it will still spin and look as though it is working, but it has no force. This will cause the engine to overheat. another thing to check is whether the electric fan comes on when you put the air con on.

1. If you don't feel a strong blow of air coming from the engine bay when it is running and the hood open, then very carefully and slowly try and see if the fan clutch is working by using a broom handle to hold it still when the engine is running. If it is working well, it will kick the broom handle out of the way. If not, the fan will just stop spinning with the broom handle holding it.

2. turn air con off and run engine. check fan clutch. If fan clutch ok, then turn air con on and see if the electric fan is running as well. If electric fan is not running as soon as you put the air con on, then the supply to the fan is faulty. This could be a fuse, a bad connection, or even switch relay.

The engine fan cannot cool the engine sufficiently on its own with the air con on.

an easy way to get air out of the engine coolant system is to take the cap off, and turn the engine on. with the engine cool enough, you can carefully squeeze the top coolant hose to push out the air and this should make the cooland level drop. top up the coolant through the radiator cap - not the reserve/expansion tank. with the rad topped up to the brim, put the cap back on.

do these tests first. They're easy and will let you identify if the system is working. If these are working, and it's still overheating, then it could be the rad cap becoming faulty, or even if its a replacement cap, it's rated wrong for the lbs, and doesn't let the radiator breath and let the expanded hot coolant flow into the expansion tank. This will make the engine overheat and build up enough pressure so that the coolant gets kicked out of the engine via a hose, splitting the radiator, or eventually the head gasket. This type of fault usually occurs when you sit still at lights, or parked up with the engine running, and you then notice collant squirting out. Also, especially after you've ran the engine and stopped the engine running. The build up of pressure has no where to go so the hot coolant from the engine pushes the coolant out of the nearest hole it can find.

Still, something is making it run hot, it could be the clutch fan or coolant pump.

Good luck.

Apr 26, 2009 | 2005 Jeep Grand Cherokee

1 Answer

Overheating jeep & intermitant hot & cold air when heaters on ful


Hi, could be a blocked heater coil. Though I doubt it.

Some more info would be helpfull, but i'll try to give some help.

firstly, is the fan clutch working? it;ll look as though it is, and still spin the fan, but if you stand near the engine with the engine running and hood open and don't feel a force of air blowing out of the engine bay then the fan clutch could be weak. A way to test this is to very carefully and slowly try to stop the fan turning using a broom handle. if the fan clutch is working, then it;ll just kick the broom handle out of the way. you won't be able to stop it. If it isn't working, you'll be able to continue to place the broom handle and the fan will stop turning. as simple as that. If the fan clutch is faulty, you're engine will overheat. Especially at stop lights, parked with the engine running, and it'll kick out your coolant when you turn the engine off after it's hot.

secondly, if fan clutch ok, turn air con off and run engine. then turn air con on and see if the electric fan comes on immediately. With air con on, the electric fan should come on straight away. If not, the electric fan is faulty, and this could be a fuse, relay, or switch, or even the fan itself.

thirdly, if this is only occuring when you run at constant speed, and not at idle after a while, then there's a blockage in the coolant circulation. The radiator may need flushing, or the hose is getting kinked. Under vacuum, the hose can collapse and stop the circulation making the engine overheat as it gets hotter at high rev. sometimes, there are coils in the hoses to prevent this, and you may be missing one or two. These are usually at elbows where the hose connects to the engine, radiator.

Lastly, head gasket or crack in the head. check the spark plugs. If they look too clean, like they've been steamed clean, then you may have coolant leaking into the combustion chamber. At higher revs, this will cause heat and pressure buidup in the coolant system, eventually leading to overheating at speed. The crack/leak may only become more prevalent at higher revs, thus higher pressure. Even the slightest/smallest leak can cause this problem at speed but not at idle.

Good luck. Check the components first. Make sure the fans are working, then check the hoses for coils, and then the spark plugs. spark plugs should have a little carbon buildup. If it's the crack or gasket, then the plugs will look too clean. It may only be one plug/cylinder, so check them all.

Jan 24, 2009 | 1997 Dodge Intrepid

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