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Electric cooling fan will not start, not even with AC on, when car is in traffic it will overheat HELP!!!

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  • Saturn Master
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Check teh fan motor with a couple of wires direct from the battery

Posted on Aug 27, 2010

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Posted on Jan 02, 2017

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My pajero is overheating afew minutes after starting what could be the cause?


An overheating engine is more than a bummer, it can be an expensive engine killer that will leave you on the side of the road, then on to the repair shop for an expensive repair bill. If your car has been running hot, you know the feeling. You're sitting in traffic, the light turns green, and you pray that traffic breaks enough for you to get some air flowing over the radiator so that engine temperature needle will go down just a little bit. It's beyond stressful, and there's no reason you should be forced to endure this. The fact is, there are only a few things that commonly cause an engine to overheat regularly. 1. Low Coolant By a large margin, the most common cause for engine overheating is simply a low coolant level. Your engine's cooling system relies on coolant to circulate and remove heat from the engine. If you don't have enough coolant in there to do the job, heat will build up and your engine will overheat. No amount of running the heater in the summer will help if you don't have enough coolant in the radiator to transfer that heat. By far, the first thing you should do if your engine seems to be running hot is check your coolant level. 2. Electric Cooling Fan Failure If you have an electric cooling fan that isn't coming on, this can cause your engine to overheat. The electric cooling fan draws cooler air through your radiator when your car isn't going fast enough to ram it through from the front. You can test this by letting your car idle long enough for the engine to heat up. If you've been having an overheating problem in traffic, keep an eye on your temperature gauge. When it starts creeping into the danger zone, look under the hood to see if your electric fan is running. If it's not, you'll need to figure out why. There are two usual causes to this:
2a. Bad Electric Fan: Sometimes your fan motor will just burn out and your fan won't come on at all. To test this, find your radiator fan switch and disconnect the wiring harness. Get a jumper wire and insert it into both contacts, your fan should come on. Another way to test the fan is to turn on the air conditioning. Most, but not all, cars activate the cooling fan at either a medium or high speed when you turn on the AC.
2b. Bad Radiator Fan Switch: There is a switch that tells your cooling fan to come on when your coolant reaches a certain temperature. The easiest way to test this switch is to disconnect the wiring harness and then run a jumper wire across the harness contacts. If the fan comes on, you need to replace the switch. 3. Thermostat Not Opening The most common symptom of a failed thermostat is overheating at highway speeds. Your engine may be able to stay cool at low speeds because it's not working that hard, and therefore not creating as much heat. But at highway speeds your engine needs lots of coolant flowing through. If the thermostat doesn't open, there isn't enough flow to keep things cool, and you'll find yourself looking more like a steam ship than a sedan going down the highway. 4. Broken Fan Belt There are still lots of engines out there which have a fan belt to drive the engine cooling fan. If you see a belt attached to your fan, you're in this club. The good news is your repair is always cheaper than the electric guys. You can replace your fan belt easily if it's broken. 5. Clogged Radiator If your car has more than 50,000 miles on it, your radiator could start getting gummed up. You can avoid this and other problems associated with old coolant by flushing rad every year.

Nov 26, 2013 | Peugeot Liberte Cars & Trucks

1 Answer

The radiator fan on my 2007 bmw 525i works fine while car is driving. Once i stop at a red light or in traffic the the fan stops working, ac blows hot air and mins later the car overheats. The car has a...


My guess is that your electric fan is NOT operating at all. Under normal conditions, just going down the highway, your cooling system will function just fine without a fan running. The air flow through the radiator is adequate to keep things cool. However, when you stop, you quickly get into an "overheat" situation. Actually, you should be able to hear your fan begin operating when your engine temperature starts climbing or your air conditioner requires the fan to do its thing. Note: If you've ever severely overheated your engine, your problems may be worse than just a fan not running, but you really do need to confirm whether your fan is operating correctly, or not. Another note: I had a vehicle with a tendency to overheat when stopped. It turned out to be a faulty (leaking) pressure cap on the cooling system.

Nov 04, 2013 | BMW 525 Cars & Trucks

2 Answers

Overheating problem, what is the most probable cause?


You need to stop using it immediately before you
cause some damage or more than you may already have
That is just common sense. It should not overheat or
be any different than it was in the past without problem

The car has to be checked over/diagnosed,tested,etc for
various issues to resolve

Borrow or Rent a car until resolved

No way to guess at the problem

You should have some type of codes avail even
if the check light isn't on,you need professional help
to get a start on resolving

The timing belt maybe worn & jumped or the head gasket
bad.

Over heating isn't usually a cheap repair unless the thermostat
sticks partially closed

The RPM moves around the car is 11 years old,so it may just
need a though going over

Timing Belt,O2 Sensors,Exhaust Converter,Spark Plugs
and such

If you depend on a repair shop to do things & don't
have the knowledge to request work done throughout
the year,then you run into a lack of proactive preventative
maintenance situation. Most things are simple looking
back, once resolved

Sep 06, 2012 | 2002 Chevrolet Prizm

1 Answer

02 Lincoln LS is overheating with ac on in traffic


Yeah,fan probably needs replacing,or u could change out to the double set of electric fans.Most kits are easy to install and not real bad on the wallet

Jul 10, 2012 | Lincoln LS Cars & Trucks

1 Answer

I turned my ac in an took a 30 mile trip n back. My vehicle started overheating n now it keeps overheating. Wat could be wrong with it?


Sounds like the electric cooling fans are not engaging. There is a sensor that is usually found on the side tank of the vehicle that senses coolant temperature. When this sensor goes bad it does not start the electric cooling fans and then the vehicle overheats from the extra heat produced from the AC system and increased engine load. It is not the thermostat or it would overheat quickly upon startup in about 10 minutes. Check the electric fans. Should be two of them.

Apr 24, 2012 | 1993 Jeep Grand Cherokee

1 Answer

I have a 2001 Chevy Impala. It's started overheating after sitting in one stop for a long time. As long as your moving the car is fine but as soon as your in traffic or stopping the temp rises. It...


Check to make sure the cooling fan is kicking on it is mounted to the back of the radiator once the car gets up to temp it should kick on to coll the radiator when you are sitting in traffic on some cars if you turn the ac on the computer will automatically switch the cooling fan on

Jun 23, 2011 | 2001 Chevrolet Impala

1 Answer

1993 SW2: Engine begins to overheat after driving or in stop...


its called a thermostat. replace it. sometimes they get stuck in the closed position.

May 05, 2010 | 1993 Saturn SW2

2 Answers

I have a 2002 Volkswagon Jetta and just started to overheat when stuck in traffic, the gauge goes up to 240 and the overheat light goes on but drops to normal when traffic is moving again - any idea what...


Check
1)thermostat and also that the electric fan is kicking in when it gets above normal temp
2)blocked radiator
3)worn water pump (more so from electrolysis, ie not using the right antifreeze)

Aug 08, 2009 | 2002 Volkswagen Jetta TDI

1 Answer

When idling saturn ls 4dr sedan wants to overheat


Sounds like either you are low on coolant or the cooling fan isn't working. With engine cool remove radiator cap and check coolant level, top off if necessary. If full start engine and turn on A/C full blast, full cold the cooling fan should come on almost instantly, unless there are two individual cooling fans in which case only one may turn on. If no fans turn on check all fuses whether related to fan or not. If all fuses fine try swapping relays around, they are usually all the same size/style. If fan still doen't work you have either an open positve or ground side of the circuit, Which will require wiring schematics and a multimeter. If coolant full and fan/s turn on and engine still overheats you'll need a new thermostat installed.

Mar 24, 2009 | 2000 Saturn Ls 4dr Sedan

1 Answer

Overheating when at stop or traffic


CARS THAT USE ELECTRIC FANS HAVE A THERMOSTATIC SENSOR THAT TELLS THE FAN OR FANS WHEN TO COME ON BASED ON THE COOLANT TEMPERATURE. THIS SENSOR HAS GONE BAD. WHEN THE AC IS TURNED ON IT BYPASSES THIS SWITCH AND RUNS TO KEEP THE CAR COOL, BUT BY THE TIME YOU TURN THE AC ON THE CAR HAS BECOME TOO HOT ALREADY. YOU NEED TO REPLACE THE THERMOSTATIC SENSOR. THEY CAN BE A LITTLE PRICEY, BUT NOT A WALLET BUSTER.

Jan 24, 2009 | 2001 Ford Focus

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