Question about Toyota Corolla

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Car overheat after driving it for around five miles with the air conditioning running. Termostate , radiator has been changed already. Water pump is not leaking and is not spiting watter through the muffler. Thanks, Jean

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Hi there,

Check the following again -

0 - check coolant level
1 - check if thermostat works
2 - headgasket replacement
3 - water pump replacement
4 - check the head for cracks

Good Luck!!

Thanks

Posted on Jul 17, 2009

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I v checked the cooling system, no leaks, new water pump, water pipes solid, changed cyl. head gasket, new radiator cap, checked water level, oil level, fan working, water circulating.


no car make or model mentioned so getting an answer is hit and miss
however what you describe indicates a fan drive problem so if it is electric fan cooled-- check the fans for full blade speed ( weak motor operation) or if viscous fan hub ( fan clutch) replace the viscous hub
it is all about moving air through the radiator when the vehicle speed is slow and the engine rpms are high
if the fan is not doing the job of pulling air through the radiator , the car will overheat
at highway speeds the ram action of the air flow virtually makes a fan useless as there is more than enough air passing through the radiator to cool the water
Im guessing here but I suspect that you have a viscous fan hub

Mar 27, 2017 | Cars & Trucks

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Car is overheating


have you looked at the fan???

Jul 17, 2009 | 1998 Toyota Corolla

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How do I stop my 01 explorer from 0ver heating. I already replaced water pump thermostat and radiator


Since you have done the basics, more information is needed. Under what conditions does it overheat, and how severely? Only when at idle for several minutes? Could be bad fan clutch or missing/damaged fan shroud. Severely overheats so bad you can't drive it at all? Blown head gasket? You can often diagnosis this by running with radiator cap removed and see bubbles in the radiator, or also look for water in oil, or oil in the coolant. Also, check with parts store. I think certain years of these run a reverse direction water pump, and if you get the wrong one they will overheat badly.

Dec 12, 2014 | Ford Explorer Cars & Trucks

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I have a 1999 chevy malibu , front wheel drive with a 2.4 litre twin cam engine . the car overheats and water pours out of overflow hose. what is the cause of this?


well, a lot potentially COULD be wrong. here is my list of what to check.

hoses for deterioration and sponginess, its unlikely but possible your hoses are collapsing due to poor condition and not letting water flow through it

check thermostat for proper operation ( remove thermostat, compress spring to open it insert string then suspend it in a pan of boiling water. it will fall off the spring at the aprox. temp its set at. if it is stuck closed then its your culprit)

check water pump ( hard to diagnose, some cars have a weep hole at the bottom of the water pump that drips water while running at any temp. )

check antifreeze dilution and condition, water cools better that anti-freeze 50-50 is recommended but in hotter climates 25-75 is more appropriate. also the dirtier it is the worse it cools

ensure your engine fan is operating by running the car and observing it with the hood open. at a specified temp ( 200-230 F neighborhood) it should turn on. If it doesn't then check your fuses and wiring and repair/replace as needed

finally check for a clogged radiator/ flush it. If the car was bought used or you know for a fact the radiator stop-leak pellets were used in it. you will most likely have to replace the radiator

other factors are engine timing (shouldn't be an issue for your year of car)

I hope this helps a bit

Sep 04, 2011 | 1999 Chevrolet Malibu

1 Answer

Hello Sir, I have replaced the radiator, radiator heat sensor, radiator cap, and all hoses. There are no leaks coming from the engine. I have also replaced the anti-freeze with BMW manufactured...


After the car is cool and has been sitting for a while, remove the radiator cap, have someone start the car, the coolant in the radiator should drop a little, and there should be movement, if there is no movement, let the car run for a while, with some systems it won't cycle enough to notice until the engine warms up. If there is still no movement, you likely have a bad water pump and/or thermostat.
Another method as a "just to be sure", drain the coolant overflow tank, and fill it with clean distilled water. Drive the car for a few days (carefully not to overheat it obviously, if the engine is getting too hot to drive normally don't do this test). If after a few days of driving the fluid in the overflow tank is still clear (water), then there is no circulation in the system.
It's usually best to start by replacing the thermostat, and then re-check. If that doesn't fix the problem it is most likely a water pump, or in very rare cases a plugged radiator or coolant passage.

Jul 18, 2010 | 1998 BMW 7 Series

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What could make my 03 civic ex overheat and cool down then overheat again while losing heat inside??? Already replaced radiator, water pump, thermostat.... motor


your heater has apparently restricted the coolant flow....hopefully a good system back flushing will cure the problem....use a flush obtained from a parts house....I would buy the hose kit for flushing as well...good luck to you

Mar 04, 2010 | 2003 Honda Civic

2 Answers

Car is overheating, thermostat was changed and the radiator was flushed, car does not overheat while idoling, but when you start driving it overheats


It sounds like water pump may be your problem. It circulates a 50/50 mixture of glycol (or some form of) and water through the engine block and cylinder head and back through the radiator. In the radiator the mixture is cooled when air passes over the fins of the radiator. This is accomplished by driving or a mechanical/electrical fan when stationary. The water pump also circulates the mixture through the heater core giving the car heat. If the water pump is not circulating the water back to the radiator to cool, it will overheat. More heat is caused by the engine when driving (much less heat when idling), hence the overheating while driving.
I hope this helps and good luck!
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Nov 04, 2009 | 2003 Nissan Maxima

1 Answer

1990 Subaru Liberty Overheats


Hi,

I had the same problem with my 1993 Liberty LX. Remove the thermostat (located inside bottom radiator hose engine connection - take the connection off and thermostat is inside). Reassemble (minus thermostat), reconnect bottom hose. Slowly (very, very slowly) refill the radiator and remove the bleed plug ( located beside the top hose connection to the radiator - a black square plug with a phillips head cross in the middle). When the radiator is full and clear water (no air bubbles) is coming out of the bleed point, replace the bleed plug and then the radiator cap.

Run the engine for five minutes (approx) or until normal engine temperature is reached. Allow the engine to cool down and recheck the water level - fill if necessary ensuring that the bleed plug is open and clear water is coming out of that point. Replace Bleed plug and then radiator cap. Run engine for five minutes (approx) and then test dive. If the engine overheats keep filling the radiator until there are no air bubbles coming from out of the bleed point.

This fixed my overheating problem. Good luck and safe motoring.

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I have a 97 bmw 316i, we have changed the water pump, checked heads and changed radiator, bleed it at a 40degree angle filled it with coolant and it is still overheating after a ten minute drive?


You actually need the thermostat in to pressurize your cooling system or the coolant won't cyle through the radiator, it'll just cycle around the engine. Most people think without the thermostat in the coolant will just pump freely through the engine and radiator, but it doesn't.

Chuck in a new thermostat, purge the air out of the system and see if it overheats then. I gaurentee it won't, if it does then you've got head problems (but they should already be obvious by now).

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2 Answers

2000 sebring. Overheats with air conditioning on.


I just had my coolant flushed and my radiator cooling fan replaced. The car was slightly overheating and would "gargle" in the coolant bowl after I turned the engine off. It turned out to be the radiator was clogged up on one side.

I went full tilt and replaced the radiator, water pump, thermostat, radiator cap and timing belt. I have 85,000 miles on the car and it was about time to do these things anyway. It is running like a new car now.

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