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My 2002 1.6 ford focus overheats but the temperature gauge stays normal .the water in the top up reservoir seems to be boiling or bubbling .how could i solve this problem ?

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6 Suggested Answers

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Posted on Jan 02, 2017

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SOURCE: Car Overheats after 12 to 15 minutes of running. Temperature decreaes when I accelerate.

your fan is the problem...it's not turning fast enough to cool the engine off. I need more info on what type of fan you have....elec fan or a clutch fan?

Posted on Apr 24, 2009

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SOURCE: antifreeze ts boiling back into reservoir.

it sounds like a possible head gasket problem,you can get the fluctuation from combustion gases getting pumped into your cooling system and creating gas pockets,i would suggest taking it to a shop and have them do a block test to look for combustion in the cooling system to confirm the problem,that way you will know for sure,if it comes up negative they can also perform a flow test to make sure there is no restriction in the cooling system such as a plugged radiator or a bad thermostat,hope this sheds a little light on it

Posted on Sep 12, 2009

Testimonial: "I bet you've hit on the problem ! Car has been "using " antifreeze for a couple years now, with no leaking anywhere. Lost through the head gasket ?"

SOURCE: The coolant in the reservoir boils out of vent

Refill the coolant system reservoir when cold. Ensure the cap has a good seal and is tightened down properly With the hood raised, restart and allow the engine to idle until running temperature. 1) No agitation should be seen in the reservoir water, certainly no stream of bubbles or violent movement. If there are violent signs then this points to a blown head gasket. 2) The top rubber hose from the engine to the radiator at some point should become hot. Keeping checking the temperature gauge from time to time to see if the temperature is rising. If there is no temperature gauge response then there is something wrong with the gauge circuitry. 3) at some point here the fan (if electric or clutch operated should become engaged. If the electric fan never comes on either the temperature sensor is faulty, the fan fuse or solenoid relay are not functional or the fan motor is blown. 4) Within a few more minutes the lower hose exiting from radiator to the engine should also become hot. If these two events happen then your pump is circulating the water and the thermostat is functioning.If the top hose does not become hot you need to check your thermostat. If the top hose does become hot but the bottom one does not, even after quite a while, then either the pump is a fault or there is blockage; maybe due to sludge in the radiator core or pipes. To check the thermostat simply remove it and drop it into a pan of boiling water. Immediately you should see the thermostat pop open. Take the pan of water off the heat and watch the thermostat. After about five minutes when the water has begum to cool the thermostat should pop closed again. These events are not subtle so if they are not seen it is likely that a new thermostat will be needed. In the event the system is blocked simply remove coolant hoses and use a high pressure hose to flush the radiator and system clear of sludge. If there is air trapped in the system try putting the interior heater on to full to help flush them out. In an emergency putting on the interior heater can assist the main engine cooling.

Posted on Jun 20, 2010

Testimonial: "Thank you for your quick response and complete list of trouble shooting senarios. After going through 1 by 1 it looks like the water pump is the guilty party. A $35 part almost took out the whole engine. Thanks again."

  • 447 Answers

SOURCE: My 2002 Montana Van will over heat while idling,

These fans should turn on at about 220 degrees, give or take a couple, and then turn back off at about 210 degrees.Fans should also come on when engine is idling with the a/c on [provided the a/c works of course] If the fan[s] isn't running and the gauge is over about 3/4 of the way or will go all the way to the end then odds are your fan's aren't capable of working for some reason. The classic symptoms of a cooling fan not working are what you are describing: Cools fine at highway speeds, overheats at slow speeds. I would start by checking the cooling fan fuses located in the underhood fuse panel. I believe they are marked Cooling fan 1 and Cooling fan 2 and both should both be 30 amp fuses. If the fuses are good then you might have problems with the fan motors themselves. Hope this helps you get it working again!

Posted on Jul 15, 2010

  • 4102 Answers

SOURCE: 2000 Ford Taurus Antifreeze boiling over

hi, the problem you are having is down to one of a couple of problems, now as you state the air blows cold then this points towards the thermostat not opening so this then dont pump the coolant round the engine resulting in the top half of the being hot and the bottom half cold so this is why you only get cold air.

so the first thing you should do is get the thermostat changed.

you also need to bare in mind that the problem could be a damaged water pump this does happen from time to time so check for any signs of water leak where the water pump is by the timing belt, if their is no signs of leak then the thermostat is the likely cause.

you also need to think that as the engine has over heated this could have caused the head gasket to fail so this will need looking at to if after changing the thermostat you have the same over heating problem.

so replace the thermostat as this has clearly gone and then when you re-fill the coolant make sure any bleed screws are undone if you have any on your coolant system usually located in one of the top hoses running around the engine, (not all coolant systems have one as many are self bleeding so dont worry if you dont see any bleed screws) now when you start filling the coolant up make sure you only trickle the coolant in to prevent any air lock building up in the system.

if you are unsure what you are doing then please leave this to someone who has some idea of the kind of work involved in this type of repair

Posted on Jul 19, 2010

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2 Answers

I drive a Camry V6 3.0L Every time I top up the coolant to the recommended level and after driving the contents in the reservoir boil over and spill out.


There may be a slight head gasket leak to the coolant jacket, not large enough to overheat the engine. It is normal for some coolant to escape at operating temp, but not lots, and it should cool down to about the recommended level again.

Something is pressurising the coolant jacket. Have it tested for the presence of combustion gasses in the coolant. This is a simple test.

Another thing, that model often develops a crack in the radiator plastic top tank. It is not the problem here, but worth knowing.

https://www.youtube.com/watch?v=a3J00_e7fyo

Oct 29, 2016 | Cars & Trucks

1 Answer

The temperature stays normal but after I stopped and later when I open the reservoir the water boils out,why


You most likely have a bad head gasket allowing compression to leak into the cooling system. The boiling you see is the compression bubbling through the coolant.

Aug 14, 2015 | 2005 Hyundai Tucson

1 Answer

I have a 2002 pt cruiser. I had a used motor installed in it and less than 2000 it starts over heating. After changing the thermostat I was told that the head gasket was blown. I had the same shop that put...


I think the head gasket has blown again. If the head was not skimmed correctly or installed correctly it will blown the gasket again. The fact that the water is bubbling in the reservoir but the gauge staying in the middle means the water is not actually boiling but venting air/gas from the cylinders to the water reservoir. Check for a whitish grey substance in the inside of the oil filler cap indicating water getting into the engine oil. Also with start up - the engine will misfire badly but improve after a while. Take it back to the mechanic as he should guarantee his workmanship.

May 23, 2017 | Cars & Trucks

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Ford Fiesta Zetec engine, year 2000. overheats after getting up to temperature, stays on normal for 1-2 kilometers, then gauge shoots over to the red. I stop, can hear water bubbling, wait till it cools...


1. Check the radiator cap.
2. Check the reserve tank, whether water level is maintained or getting filled. If it's getting filled, there should be a leak in the radiator or gasket

Jun 13, 2017 | Ford Focus Cars & Trucks

1 Answer

2003 Lincoln LS V8 3.9. It was overheating. I replaced thermostat housing kit with thermostat and coolant reservoir. the coolant temperature gauge stops straight horizontal, at this time the car diagnostic...


I dont think the coolant is boiling, I think you have an air bubble in your system wich is causing a air lock and youll need it flushed out. Your reservior cap should be tight always.. never loose this is an air tight system and your allowing it to get air in it. I have a 2002 linc ls and just had to pay 1000.00 to replace the system because I let an air lock go for too long and had so much back pressure I blew up my reservior.

Aug 31, 2010 | 2000 Lincoln LS

2 Answers

The coolant in the reservoir boils out of vent tube and overheats the engine. The temp gauge also dropped to C instead of going to H when this took place. Is this syptomatic of a water pump failure,...


Refill the coolant system reservoir when cold. Ensure the cap has a good seal and is tightened down properly With the hood raised, restart and allow the engine to idle until running temperature. 1) No agitation should be seen in the reservoir water, certainly no stream of bubbles or violent movement. If there are violent signs then this points to a blown head gasket. 2) The top rubber hose from the engine to the radiator at some point should become hot. Keeping checking the temperature gauge from time to time to see if the temperature is rising. If there is no temperature gauge response then there is something wrong with the gauge circuitry. 3) at some point here the fan (if electric or clutch operated should become engaged. If the electric fan never comes on either the temperature sensor is faulty, the fan fuse or solenoid relay are not functional or the fan motor is blown. 4) Within a few more minutes the lower hose exiting from radiator to the engine should also become hot. If these two events happen then your pump is circulating the water and the thermostat is functioning.If the top hose does not become hot you need to check your thermostat. If the top hose does become hot but the bottom one does not, even after quite a while, then either the pump is a fault or there is blockage; maybe due to sludge in the radiator core or pipes. To check the thermostat simply remove it and drop it into a pan of boiling water. Immediately you should see the thermostat pop open. Take the pan of water off the heat and watch the thermostat. After about five minutes when the water has begum to cool the thermostat should pop closed again. These events are not subtle so if they are not seen it is likely that a new thermostat will be needed. In the event the system is blocked simply remove coolant hoses and use a high pressure hose to flush the radiator and system clear of sludge. If there is air trapped in the system try putting the interior heater on to full to help flush them out. In an emergency putting on the interior heater can assist the main engine cooling.

Jun 20, 2010 | 1994 Chrysler Concorde

1 Answer

Replaced thermostat, water continues to overheat and is expelled out the cap to the water reservoir. Water heat gauge show low heat then spikes to extreme high intermittently.


You have air pockets in the system. With the engine cold, remove the radiator cap. Then run the engine until the thermostat opens as you top off the radiator and keep an eye on the temperature gauge. If you think the car is going to overheat, replace the radiator cap, shut off the engine and wait 15 to 20 minutes to let the engine cool. Once the thermostat opens, lightly grab the upper radiator hose to feel for air pockets. You will feel the bubbles as they pass through the hose. Then have someone else rev the engine to 1800 - 2000 rpm and hold it there while you top off the radiator completely and then install and tighten the radiator cap. DO NOT DROP THE RPM BEFORE THE CAP IS SECURED OR YOU MAY BE SERIOUSLY BURNED!! Finally, let the engine run and monitor the temperature and road test. You may have to repeat the steps 2 or more times to remove all of the air but usually it will clear the first time.

May 18, 2010 | 1998 Ford Expedition

1 Answer

Over heats


Its the thermostat and possibly water pump in conjunction with a leak (at the cap most likely) that causes the water to boil and siphon out of the reservoir. The reservoir should not be "topped" off just fill to fill line.

May 14, 2010 | 2002 Kia Sedona

1 Answer

87 olds Cutlass boiling back threw overflow. Put new thermostat, flushed radiator and engine. Water seems to be flowing threw radiator and fan also seems to be working fine. Cannot figure out why it is...


Hello there.....

First things first: Is the temperature gauge showing normal as it is supposed to be? No contamination of oil & water on withdrawing the oil dipstick? Head gasket not the culprit here? No excessive steam on idling from the exhaust system? If these signs are not present than I suppose there could be an air lock within the cooling system - bleed the system - check if the radiator/coolant reservoir cap is satisfactory. Top up the radiator (if possible) with mixture of water & antifreeze whilst the vehicle is idling. Hope this helps.

Good luck

Jun 25, 2009 | 1994 Oldsmobile Cutlass Supreme

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