Question about 1999 Hyundai Accent

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Where is the themostack on a h100 turbo engine?

Hi the other day my h100 lost alot of water from the top up bottle. the system was under alot of pressure and just pushed the water out. did this for 2 days had to keep topping the water up. then yesurday did 100 miles lost no water and the system was not under any pressure???? wierd think it could be the thermostack. if anyone had any other ideas please let me no. and if you no where it is on the h100 2.5 turbo that would be a help to had a quick look but didnt see it.


thanks for you time

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Usually it is close to the water pump.Two smaller size hose should come out from under the cover of the thermostate .You probably need to remove the top cover to see the thermo valve itself.If the thermostate not working(or not working temporary)then main radiator in the front of the wehicle stays cold.Thermostate can get stuck,it means that it is working sometimes,sometimes not so the hot water cant get to the radiator to cool down .Pressure goes high up ,water runs everywhere.There is one more thing can cause such problem on your car.If the water reaches a certain temp then a ventilator should turn on on the radiator which suppose to cool down the water.If you drive fast enogh then the travel wind can do the same thing .So probably your ventillator stoped working.

Posted on Jul 23, 2009

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Posted on Jan 02, 2017

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Hyundai h100 turbo loses water from radiator but the water bottle stays full


Hello Basil Miller,

What you need to do to resolve the issue is to beg, borrow, rent or buy a COOLING SYSTEM pressure tester...
(way less than an hour of an in-competent "MECHANIC"
(although a competent mechanic could have your
issue identified in minutes)).

I will try to attach a sample picture from AMAZON
(search on "STANT+RADIATOR+PRESSURE+TESTER")...

I bought a SNAP-ON (BluePoint) years ago and have
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Carefully look around the engine and find out where
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Amazon com Stant 12270 30 Pound Cooling System AndPressure Cap Tester...

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