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#1

Posted 15 April 2010 - 08:34 AM

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Hi all recently i was testing the integrity of my fl n16 sunny's cooling system. Wat i did was open the rad cap after park overnight. Noted water slightly below the lower brim of rad. Start engine & idle. During initial idle the water level started rising till overflow the brim however when its hot ard 1/2 on the temp gauge & fan started running the water level started going down & bubbles started forming on the water surface. When fan stop the water level rises again & cycle repeats. Is this normal?

#2

Posted 18 April 2010 - 02:54 PM

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its normal... that is why u only fill the radiator water up to the max mark at the reservoir. Not FULL.

If your radiator needs more water, it will wirthraw the water from the reservoir, when it has too much water, it will flow back to the reservoir. Thats the use of the radiator reservoir...

#3

Posted 22 April 2010 - 10:13 PM

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the tiny bubbles that make the radiator "foam up" is the result of exhaust gas leaking into the radiator.

#4

Posted 22 April 2010 - 11:33 PM

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Hi chiangauto i believe u r right. So if its not normal is it serious? Wat can be done to fix it? Thks

#5

Posted 23 April 2010 - 12:52 AM

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Hi chiangauto i believe u r right. So if its not normal is it serious? Wat can be done to fix it? Thks


Dont be stupid. Chiangauto doesn't know s--t what was happening. There is nothing wrong with your radiator or your engine.

Your radiator system is supposed to operate at slightly high pressure which in turn will make the water's boiling point higher.

The phenomenon you're seeing of water level rising and dropping is due to water expanding and contracting when heated and cooled.

So put back your radiator cap and drive as normal.
There is a fifth dimension, beyond that which is known to man. It is a dimension as vast as space and as timeless as infinity. It is the middle ground between light and shadow, between science and superstition, and it lies between the pit of man's fears and the summit of his knowledge. This is the dimension of imagination. It is an area which we call The Twilight Zone.
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#6

Posted 23 April 2010 - 03:05 AM

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Hi i accept the explanation abt the rise & fall of the water level however wat abt the presence of bubbles? Thks

#7

Posted 24 April 2010 - 04:55 PM

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Hi i accept the explanation abt the rise & fall of the water level however wat abt the presence of bubbles? Thks


Obviously housework has escaped you.

Go to the kitchen and boil some water first before I continue. Just to add: Watch the water boil too.

Edited by Gendut, 24 April 2010 - 04:56 PM.

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#8

Posted 24 April 2010 - 05:40 PM

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With cap off the cooling system water will boil at 100 deg C. The purpose of the cap is to pressurised the system so that cooling water will have higher boiling point. By adding anti-freeze the boiling temp can be a\further increase.
Without knowledge of how the cooling system works and behaviours , how are you going to carry out the system integrity test.
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#9

Posted 24 April 2010 - 06:51 PM

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the tiny bubbles that make the radiator "foam up" is the result of exhaust gas leaking into the radiator.



wah... u mod ur car until so jialat ahh?? people turbo charged car connect the exhaust fume to intercooler but u connect ur exhaust to radiator? laugh.gif laugh.gif

Edited by Tigershark1976, 24 April 2010 - 06:54 PM.


#10

Posted 24 April 2010 - 06:54 PM

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Dont be stupid. Chiangauto doesn't know s--t what was happening. There is nothing wrong with your radiator or your engine.

Your radiator system is supposed to operate at slightly high pressure which in turn will make the water's boiling point higher.

The phenomenon you're seeing of water level rising and dropping is due to water expanding and contracting when heated and cooled.

So put back your radiator cap and drive as normal.



no lah, chiangauto upgraded his turbo liao.. but try to save money on intercooler, so he directed his exhaust to radiator directly instead. water cooling more efficient mah.... 1st in SG, probably 1st in the world as well laugh.gif laugh.gif

Edited by Tigershark1976, 24 April 2010 - 06:56 PM.


#11

Posted 24 April 2010 - 07:13 PM

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hi ruggles

i think it is normal, unless when u open ur rad cap after overnight park and u got to top up abt a glass of water, then got problem.

when the radiator is cool, the water level in the radiator is always below the brim, abt 3 cm down, the the resrvoir level at max line. as long as ur coolant reservoir nv decrese fast then its fine.

#12

Posted 24 April 2010 - 10:59 PM

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To think that he troubleshoots other peoples car! It just gives me the shudders.

http://dennischiang.blogspot.com/

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#13

Posted 24 April 2010 - 11:55 PM

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maybe chiangauto always have to think so deep that he failed to deduce simple problems....a blown head gasket against a missing rad cap?both give blubbles but one cost a hand and a leg to fix and the another one almost free.. laugh.gif

#14

Posted 25 April 2010 - 11:49 PM

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To think that he troubleshoots other peoples car! It just gives me the shudders.

http://dennischiang.blogspot.com/



WHAT??? is it coincident that the workshop shares the same name as him so he put the link in his signature or he is really related to the workshop? or maybe some competitors trying to screwup the workshop reputation?? I really cannot believe someone with technical background would say radiator water bubbling caused by exhaust gas leaked into radiator!

Edited by Tigershark1976, 25 April 2010 - 11:52 PM.


#15

Posted 26 April 2010 - 08:06 AM

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Lets give him the benefit of doubt, he maybe referring to combustion gases leaking into the cooling system via the cylinder head gasket. We must not assume that all mechanics have the opportunity to undergo formal or approved training programms.

Edited by Yeobh, 26 April 2010 - 08:09 AM.

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#16

Posted 26 April 2010 - 12:43 PM

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Lets give him the benefit of doubt, he maybe referring to combustion gases leaking into the cooling system via the cylinder head gasket. We must not assume that all mechanics have the opportunity to undergo formal or approved training programms.


Noted Yeobh. But as a professional in the industry to give:

"the tiny bubbles that make the radiator "foam up" is the result of exhaust gas leaking into the radiator."

without any other alternative possibilities is at the very least, mischievious.

There is a fifth dimension, beyond that which is known to man. It is a dimension as vast as space and as timeless as infinity. It is the middle ground between light and shadow, between science and superstition, and it lies between the pit of man's fears and the summit of his knowledge. This is the dimension of imagination. It is an area which we call The Twilight Zone.
Rod Serling

#17

Posted 26 April 2010 - 07:39 PM

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Lets give him the benefit of doubt, he maybe referring to combustion gases leaking into the cooling system via the cylinder head gasket. We must not assume that all mechanics have the opportunity to undergo formal or approved training programms.



bro, think u r simply too kind...

#18

Posted 27 April 2010 - 07:34 PM

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Not ready, I can understand them because of my 30yrs + associating with the auto industry.
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#19

Posted 06 May 2011 - 03:07 PM

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Lets give him the benefit of doubt, he maybe referring to combustion gases leaking into the cooling system via the cylinder head gasket. We must not assume that all mechanics have the opportunity to undergo formal or approved training programms.



Sorry for bringing up the OT.

I am driving a pre-fl nissan sunny n16.

My car has this symptom and I suspect my car's cylinder head gasket is leaking gases. Because every morning before I start the car, I noticed the coolant reservoir will overflow while the coolant in radiator remained low. And while opening the rad cap, I can hear the air/gas escaping.

I tried siphoning the excess and reused it to top-up the radiator. It will go back to the same overflow problem after a few days i.e. I'll siphone the coolant down to the minimum level, not max, while the coolant in the radiator is top-up to the neck, but after a few days it went back to the max level of the reserved reservoir. My temp gauge does not shows overheating. drivingcar.gif

Is it head gasket problem or thermostats or other problem?

Anyone has encountered this problem before and how much is the damage?

Any reliable and reputable workshop to recommend?

I'm asking around so that won't kenna knife.gif



#20

Posted 06 May 2011 - 03:43 PM

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Put ur hand into the radiator cooler, den u will automatically know why there is bubble.


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