Hissing sound and high engine temp

[Pippo21]

Hi mga sir! My 90 rolla is at it again. I think I may have hose leak or radiator leak but help me with your thoughts.

May hissing sound sa driver side then bigla umaakyat temp to half even pag idle lang. Tuloy tuloy sya even kahit di tumatakbo. Drive 5km and almost red line na sa temp.

Nagtop up na ako ng coolant and i checked the pump. Mukang okay naman kasi nung una, reservoir lang ang nilagyan ko ng coolant. Pumasok naman sa radiator.

Please help. TIA

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[wezz_zzew]

Check regularly your radiator water level kung nababawasan. If so, baka yung hissing sound na nadidinig mo is water dripping on a hot surface, e.g. Engine.


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[jakewise]

The hissing sound may indicate water is leaking most especially that you mentioned that you had to refill your reservoir tank. At times the leak is so small that you cannot see the water drop as the heat of the engine evaporates it quickly for you to see it unless you are observing it while the hood is open. Check all your hoses, and radiator (cooling system). There is definitely a leak somewhere.

[Erick Chavez]

nangyari na sakin yan, meron palang singaw sa may bandang intake manifold, hindi lapat yung gasket, pag uminit na yung water lumalabas doon yung singaw parang takure initan ng tubig

[jaypee10]

kapag nilagyan ng coolant madaling ma trace kung may mga leak ang cooling system..kasi hindi siya kaagad natutuyo kagaya ng tubig.
paandarin mo at painitin saka mo silipin paligid ng makina kung saan dumadaloy ang cooling system mo..

[Red Advent 04]

:detective::detective::detective:






dagdag tanung din sa kasama nating bro tsikoteer tungkol sa hissing at high temp, napansin kodin wala naman tulo o tagas sa mga linya, pero nataas ang temp nya. sa akin kase normal ang guhit nya sa kalahati mag biyahe man ako ng malayo o ma trapik, pero kapag naka park at engine running kapag tumagal ng mahigit kalahati oras e tumataas ang gauge nya tapos kapag binuhusan na ang tangke ng tubig at reservior nya e nababa at nabalik sa normal. napansin ko lalo na ngayong pumasok ang tag araw palagi ganun, pero kapag tag ulan naman odi naman sha sobra init ng panahon e normal naman temp gauge nya. anu ba ere normal laang o may problema sa cooling system? mitsubishi adventure gas nga pala gamit ko..

[jick.cejoco]

Hi mga sir! My 90 rolla is at it again. I think I may have hose leak or radiator leak but help me with your thoughts.

May hissing sound sa driver side then bigla umaakyat temp to half even pag idle lang. Tuloy tuloy sya even kahit di tumatakbo. Drive 5km and almost red line na sa temp.

Nagtop up na ako ng coolant and i checked the pump. Mukang okay naman kasi nung una, reservoir lang ang nilagyan ko ng coolant. Pumasok naman sa radiator.

Please help. TIA

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May hissing sound sa driver side then bigla umaakyat temp to half even pag idle lang


if you hear the hissing sound at the driver side, it might be your brake vacuum booster that is leaking and adding false air (unmetered air into the intake manifold that was undetected by the airflow meter or MAP sensor or the MAF sensor). the added oxygen makes the air/fuel mixture lean and makes the engine temperature high. similar to the oxy/acetylene torch, if you add more oxygen, the flame turns light blue green and the temperature hotter. try disconnecting the vacuum hose to the brake booster and plug it to prevent a larger vacuum leak and to eliminate the possibility that the brake booster was indeed leaking air into the intake manifold

[Pippo21]

I give up. Di talaga kame magkta ng leak. Pero at least may idea n ako kung ano nangyayari. Thanks mga pogi!

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[brainmafia_310]

Ano nangyayaro Sir?

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[jick.cejoco]

I give up. Di talaga kame magkta ng leak. Pero at least may idea n ako kung ano nangyayari. Thanks mga pogi!

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"rest if you must, but don't you quit"



if you can not find the leak, do a static pressure test on the cooling system. otherwise, you are losing coolant as you drive that does not leave a trace where the potential or possible leak is coming from

[dr. d]

I give up. Di talaga kame magkta ng leak. Pero at least may idea n ako kung ano nangyayari. Thanks mga pogi!

Samsung N9005 powered by Smart posted using tsikot mobile app

perhaps if you use a stronger, bigger flashlight..?
tiyaga lang yan, bossing. water doesn't disappear. it has to go somewhere..
and while you're there, check the aux fans, if they still in good working order.. rotating fan blades isn't an indication of good functioning. they have to rotate very fast and move vast amounts of air..

[Pippo21]

Isang tingin pa bukas kung wala talaga, im going to get expert help. Checked hoses, vaccuums and radiator body. Aux fan is good.. water pump is also good.. one observation tjough, nung mejo natagalan syang nakabukas, edi nagclimb na temp.. after ko patayin, palamigin, may deposits ng coolant sa radiator cap pag tanggal ko.. umakyat ng ganun kataas ung coolant! Im thinking may massive pressure build up sonewhere... which is odd kung leak to... >.<

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[dr. d]

boiling water is a good source of high pressure.
teka... kamusta ang radiator mo? are the cooling fins clean? baka naman puro dumi na siya, hindi na maka-lusot ang hangin..

[jick.cejoco]

which came first, the chicken or the egg? which came first, the hissing sound or the overheating? the only time overheating makes a hissing sound is when pressure is leaking from the pressure cap or some weak point that can not hold pressure. in this case, the leak must be visible. but a hissing sound that was caused by a vacuum leak will definitely cause overheating and lose coolant through the radiatior cap or overspills at the recovery bottle. stop guessing.use a vacuum gauge to see that you have engine vacuum between 17- 21 inches of mercury assuming your camshafts are OEM and that the engine is neither supercharged nor turbocharged. use diagnostic instruments to digitize your results and stay away from amateurs.

[willyfernando]

I had a similar experience with my Mazda Miata and it turn out to be the cylinder head. There was no leak but the engine kept overheating. They had to reface the cylinder head and change the head gasket 'coz apparently it was slightly uneven or not perfectly flat due to the overheating and wear. That did the trick. The early problems of overheating that preceded the warping was attributed to other factors that later escalated to this main issue like poor water quality in place of proper coolant, undetected radiator fan motor's poor condition and irregularity of oil changes. I guess I had to learn the hard way. Poor PMS = Potential engine disaster

[Pippo21]

Radiator effing cap.. solved at 180 petot.

Pffffffffffffffffffffft

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[Pippo21]

which came first, the chicken or the egg? which came first, the hissing sound or the overheating? the only time overheating makes a hissing sound is when pressure is leaking from the pressure cap or some weak point that can not hold pressure. in this case, the leak must be visible. but a hissing sound that was caused by a vacuum leak will definitely cause overheating and lose coolant through the radiatior cap or overspills at the recovery bottle. stop guessing.use a vacuum gauge to see that you have engine vacuum between 17- 21 inches of mercury assuming your camshafts are OEM and that the engine is neither supercharged nor turbocharged. use diagnostic instruments to digitize your results and stay away from amateurs.

My mechanics did this. they closed the radiator properly with a new radiator cap... they also recommended lavramon for my radiator which I did. madumi na daw kasi.. baka daw kasi hindi nakalabas ng maaus pressure kaya nung minaneho ko ngang summer na sobrang init, naghanap ng ibang outlet ung excess pressure, leading to a the radiator cap leak. >.<