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Re: Engine fan not staying on after car is running. Car...
It is only on when it is at a idel at a stop, it will come on if the ac is on but going down the highway it is only supposed to come on when it gets hot then turns off. itsa feature to save fuel, if it stayed on all the time it would use abut 3 horse power causeing lower fuel milage, as long as the temp gauge is normal don't worry about it.
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May be a bad fan or thermal switch not working. The a/c condenser sits in front of the radiator. It may be that the load on the engine going up the mountain is too much for just the air blowing across it to keep it cool, and the car shuts the a/c off to try and keep engine temp down. Cruising along on level ground is enough to keep things cool. Going up the mountain means more engine heat and probably reduced speed, which reduces air flow, especially if a fan isn't working.
Let car cool off, start engine and let it warm up without driving. Monitor temp and fans. When temp gets about normal, look for fan to kick on. Then when turning on a/c, look for the other fan to kick on. Don't let engine overheat. If one or both fans don't come on, start there. Check fan motor not locked up, relay working, fuse/wiring good.
I didn't know it had a light on the dash that said "cooling fan temp". My 93 doesn't. The cooling fans are controlled by the computer and turned on when the ac is running or when the engine reaches 220 degrees. A mechanic would check the fuse and relay for power and the fan motor for power and ground.
Full coolant level does not mean your engine cannot overheat. You need to fix the problem as overheating will destroy the engine if not addressed.
The radiator cooling fans must be working, as must the water pump. The thermostat must also be working properly. There must also be no air in the cooling system as air locks will impair water flow. When cooling systems are drained fully or partially and re-filled air in the system must be bled out using the correct bleeding procedure for the particular engine/cooling system. Failure to do this properly will lead to overheating.
If you ONLY see the overheating warning when running your aircon you need to check that the electric radaitor fans are kicking in at idle when you switch on and run the aircon and the engine has been warmed up some. If they do not start operating when the a/c is running you will get an overheating condition in normal driving conditions.
If the radiator fans are operating normally and you still get an overheating warning when the aircon is on or off the most likely culprit is a faulty thermostat in the engine's cooling system which will need to be replaced.
If you have either a faulty thermostat or if the water pump in the cooling system fails you will get continuous overheating whether the aircon is on or off.
If your vehical is over heating at idea it is most likely the radiator fan this can be checked by running the car until it heats up and looking at the fan to see if it is running. This usually isn't an issue as long as you are driving, but when you stop or driving slow or in traffic it will start heating up quickly. your fan keeps air flow going through the engine while at a stop to help cool down the engine compartment and pull.push air through the radiator
If you still over heat no matter if your driving or stopped it may be a thermostatic radiator valve that went bad. this is a release valve between the radiator and the engine that helps control the coolent flow between the engine and radiator and control how much heat is taken out of the engine to be cooled in the radiator.
So, run the car and see if the radiator fan kicks on. if it does, it's probably not a bad fan. if your car starts over heating and the fan never comes on it's most likely some problem with the fan
if it is turning and you are still having problems overheating go buy a new valve and change it out. cost you at most 5 bucks for a new one (probably less)
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
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.
Check the coolant temperature with the car stopped. At idle with the hood up keep the thermometer in the coolant. Confirm if the coolant is not overheating but the engine is!!
Run the A/C keeping the thermometer in the coolant and allow the fan to kick on.
If with the A/C on the engine doesn't overheat then it confirms that the low speed on the fan motor is not working. Read the description of the Taurus where the low speed is used for normal operation when temperature is required but the high speed is activated when the A/C is on. The circuit is simple.
In your case the low speed has to be activated for the A/C to go into the high speed. The fact that the high speed is working and low speed is not indicates the low speed of the fan is defective.
Other problems such as the thermostat or plugged cooling system(radiator clogged) could be the root problem!
the thermostates on the 3400 engines are late because the fans kick in at the last moment. if you run your ac on you will notice that the gauge stays in front of the half mark or right on the half mark. that is because when you turn on your ac your fans will kick in earlier and stay on the whole time the ac is on. if you run your car with the heat on or nothing on that leaves the late thermostate to kick in verus you turning on your ac and it by passes the thermostates and runs the fans once the engine gets at at lest 120 deg. i use to have a 2002 and i had the same problem. this will keep your engine cooler. also if you don't want your air on just turn on your windshield defrosters (not the back windshield) and that helps keep your engine cool because your defrosters use your air compressor which is really your ac. so it still kicks the fans on earlier.