Posted by edbalboa on Jan 02, 2009
i have an 87 celica convertible 2litre japanese import after driving on a hot day the overflow tank attached to the radiator appeared to be boiling,after cooling down I topped up the coolantwhich needed a very small amount .after a short test drive the o/flow was gurgling and the rad was already quite hot.the temp guage remains normal .Can any one advise?
Comment posted on Jan 03, 2009
as i described before also the second time after my short test drive I opened the rad cap while the engine was running and the coolant sprayed out with a lot of pressure.Also icannot find any specifcations on the volume of coolant it takes to fill up when the system has been emptied I was only able to put around 3 litres in there.threre is no sign of any oil in the cooling system nor water in the oil as Its been suggested that it may be the head gasket.the radiator appears on the outside to be in good condition,the car has only travelled 160000 ks . also I have been trying to find out which radiator fits the car because the 87 has a camry 2ltr moter i presume it takes camry
Ok changed the thermostat,car runs normal ,temp guage normal ,how ever losing around 1 litre coolant after driving 50 to 80 ks on a hot day
usually with gurgling action in exspansion tank (thanks jonnydiesel) is this normal ?.have noticed coolant overflowing from expansion tank while testing car in driveway how ever I may have overfilled the tank.
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Re: still losing coolant
Hi, Sounds like the water pump is not circulating the water, as soon as the engine heats what water is in it, it will boil. Since you are brave enough to open the radiator when it is hot ( Bad Idea ! ) open it when it is cold, start the car and watch to see if the coolant circulates. You may have to wait unit the thermostat opens and if the water pump is bad when the thermostat opens it may spray hot coolant and steam instead of circulating what is in the radiator so don't be in the way. Not the best way to test this but works if you don't have diagnostic tools. Good Luck! By the way, coolant means antifreeze mixture which if it gets too thin lowers the boiling point significantly.
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Losing fluid from the relief port is a sign of the coolant pressure being too great or just a cap that has had better days. The smell of hot coolant lingers so not seeing a leak is totally possible. Unfortunately, there are other problems that could cause this such as a bad head gasket which will introduce high pressure into the cooling system and thus forcing coolant out through the relief (overflow).
I say change the cap, it's cheap enough and probably original. Make sure the coolant is clean and mixed properly. If it persists, there is a dye you can put in the cooling system that reacts with combustion gases and can be seen under and ultraviolet light. If you are getting combustion gases into the cooling system, the repair is quite expensive.
I believe that you are filling the reservoir too much...There should be two fill lines...1 cold fill line and 1 hot/warm fill line....If you put coolant up to the hot fill line when the engine is cool, then when you are driving the coolant starts to boil and comes out of the overflow because there is too much coolant....That's why its important to fill to the right line..
Coolant flows to the overflow tank (white plastic tank- not to be confused with the washer fluid resevoir) when it is hot, then gets sucked back into the radiator when needed. In theory, you should never need to open the radiator itself. Just make sure the overflow tank is full to the cold line if your engine is cold, and full to the hot line if it the engine is hot. If you recently drove your car, the level will gradually change in that overflow tank (as coolant is forced out of the radiator and eventually sucked back in. Unless it is completely empty, you shouldn't need to add much.
There is a fan coolant temperature sensor on the bottom of the radiator, it has an electrical connector on it, with the key on disconnect the connector, if the fans run constantly with the connector off replace this sensor.
check and make sure you are full of coolant in your radiator/overflow reservoir. This is important!
If you see you are full of coolant and it gets hot once you drive down the road 15 minutes you have a thermostat stuck in the open position.
If that isn't the case, you probably have a faulty heater core plugged up.
Are you leaking coolant anywhere? Do you smell antifreeze? If the heater core is behind the dash you might see water on the floor or your defroster will fog up the windows on a cool day.
I hope this helped you out somewhat. Please let me know what you find!
The smell is most likely the anti-freeze you smell. You may need a new overflow cap, which over time will not hold pressure like it should and can cause you engine to run hot and lose coolant. It could be the water pump leaking, a hose leaking. Can you see where you may be losing coolant at? How often does it run hot? Do you have to re-fill after it runs hot. If you not having to add coolant, then your thermostat may be bad or the water pump. But losing coolant could be the overflow cap or a hose, and let's not forget the radiator could have a small hole or split somewhere. It's a matter of finding out where or what are it is leaking in.
leave the overflow tank cap off and start engine. turn your heater setting to max heat and fan on highpour 50/50 mixture of coolant till you see the coolant at the proper level on the tank. wait for the vehicle to reach optimum temp about 180 degrees. you should feel; the upper radiator hose it should be hot. then check level of coolant in overflow tank fill to proper level if neccessary. A quick note if you continue to lose coolant and can;t find a leak chances are it's being burned in the cylinder and this would mean you have a blown head gasket. to check this just start the vehicle the next day if there is white smoke yo have a seeping gasket if it's a constant white smoke then it's a severe problem and needs to be repaired immediately or you will warp or crack the intake manifold , the head or the block.. please rate this........thanks