Question about Kia Optima

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My car in sometimes overheat when it does that is when is in idle, but if you take off it will cool off and the other day i was driving on the highway and it was overheating i pulled over i did turn it off and turn it back on and the gauge was at normal tempeture, thanks for your help

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First off, what kind of car is it? Secondly, is there proper amount of antifreeze in your radiator and resevoir? Does the fan on your radiator turn on when the car starts to get too hot? If your coolant level is good and your fan is working go ahead and check and replace the thermostat.

Posted on Apr 06, 2011


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Um having a Mazda Axela, 2004 model (Right hand drive) 2300cc. Problem is sometimes the coolant is getting less.

have a compression test done to check for head gasket and cracks. have a pressure test done on the coolant system to check for leaks. Check the drain hole under the water pump as it may be leaking from a bad pump shaft seal . If you have a viscous fan hub then check the operation as they have been known to spin but draw sufficient air through the radiator to cool the coolant.. If it overheats predominantly at stop lights or when idling then replace the fan hub.

Jan 26, 2014 | Mazda Cars & Trucks

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Car overheating on idle

Does the radiator fan come on before it overheats?
And is it boiling over, or just showing hot on the gauge ?
Is the cooling system full of coolant and no air pockets ?
How do you know the thermostat is ok ?

Jul 29, 2012 | 2003 Ford Focus

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My car is overheating

For car running hot and overheating issues, I suggest to you go through this help links. Click this link below and go through the troubleshooting procedure to take care of the problems: ----Car runs hot?
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Feb 16, 2012 | 1998 Chevrolet Cavalier

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I have a 2001 Oldsmobile Alero. For the second time in a year my car has been overheating. The first time the problem actually went away after a few days before I even had the pressure tested. This was...

First the reason the heater is not working is because there is air in the system and these engine are known to trap air.There is a bleeder at the top of thermostat housing to remove the air.Take the radiator cap off while the engine is off and cold and add coolant/water mixture till fluid streams from bleeder screw(will need to be removed) then tighten screw and install radiator cap.Let it idle and see if it over heats and pay attention to the cooling fan operation and heater operation.If it does not overheat after 20 minutes the take it for a drive and see if it overheats.I fit does not overheat idling but does overheat driving you have a bad radiator.Dexcool is great for pugging radiators and heater cores.It is possible to flush the radiators and fix sometimes but new ones are not that expensive.I would probaly replace.If it overheats idling and fans are working suspect a bad thermostat.Good Luck!

Apr 20, 2011 | 2001 Oldsmobile Alero

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.

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1988 Sedan DeVille: the car still over heats even after i change the t...

if the car overheats all the time, idle and driving, then check the water pump

if the car only overheats at idle, check the cooling fan

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1 Answer


you have a 1.8 liter turbo engine correct? it is the water pump that is driven by the timing belt. 100% positive this is correct i have replaced countless water pumps for this reason. the reason it overheats while driving is becuase the splines on the water pumps plastic impeller are gone and it is just freewheeling on the pump shaft. at idle the pump spins slow enough to get the impeller to turn. very very very very common. replace water pump timing belt and tensioner.

Nov 02, 2009 | 2001 Volkswagen Passat

2 Answers


I am not an expert on Mazda vehicles but sounds like your fan temperature sensor is not working properly. My fan comes on low speed when the temp hits 205 and goes to high speed at 220 or when the air conditioning is on. You had better get it checked by your dealer or service tech.

Aug 03, 2009 | Mazda MPV Cars & Trucks

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