4ringpieces
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« Reply #15 on: March 09, 2017, 08:58:55 AM »
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Have you checked for pressurising of the coolant system? I suspect you have an underlying problem
Coolant also lubricates water pump bearing too
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adam-
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« Reply #16 on: March 09, 2017, 09:57:08 AM »
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How do you know it failed?
Never had an issue. Genuine VW, no problems. I ran water for 2 years too.
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dokalanyi
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« Reply #17 on: March 09, 2017, 10:51:54 AM »
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How do you know it failed?
Never had an issue. Genuine VW, no problems. I ran water for 2 years too.
Interesting question -- I took the mechanic's word for it. Now I've just checked by boiling it in water, and it actually opens. So it's still fine. WTF.
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dokalanyi
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« Reply #18 on: March 09, 2017, 10:52:39 AM »
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Have you checked for pressurising of the coolant system? I suspect you have an underlying problem
Coolant also lubricates water pump bearing too
Please give me more information on this. I believe I have an underlying problem, which isn't the thermostat.
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nyet
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« Reply #19 on: March 09, 2017, 11:01:55 AM »
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Use distilled water and a proper coolant ![Tongue](http://nefariousmotorsports.com/forum/Smileys/default/tongue.gif)
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4ringpieces
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« Reply #20 on: March 09, 2017, 11:19:47 AM »
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Pressure blows rubber hoses not temperature, unless your hoses are about 25/30+ years old
I suspect you have pressurisation in your coolant system be it from slight headgasket failure or other reasons
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dokalanyi
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« Reply #21 on: March 09, 2017, 11:35:27 AM »
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Pressure blows rubber hoses not temperature, unless your hoses are about 25/30+ years old
I suspect you have pressurisation in your coolant system be it from slight headgasket failure or other reasons
Would knock cause head gasket failure?
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IamwhoIam
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« Reply #22 on: March 09, 2017, 02:26:53 PM »
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A thermostat cost like $10 and takes 20 minutes (max) to change.
100 dollars says you've never seen a 2.7TT thermostat and don't have a clue where it lives ![Cheesy](http://nefariousmotorsports.com/forum/Smileys/default/cheesy.gif)
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I have no logs because I have a boost gauge (makes things easier)
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KasperH
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« Reply #23 on: March 09, 2017, 03:57:08 PM »
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100 dollars says you've never seen a 2.7TT thermostat and don't have a clue where it lives ![Cheesy](http://nefariousmotorsports.com/forum/Smileys/default/cheesy.gif) And you would win ![Wink](http://nefariousmotorsports.com/forum/Smileys/default/wink.gif) But there was never a mention of it being a 2.7TT Or any mention at all what car it was, and that is my error for not asking in the first place ![Smiley](http://nefariousmotorsports.com/forum/Smileys/default/smiley.gif) But since he has tried it himself, I'm assuming it's more likely a 1.8 20vT ![Tongue](http://nefariousmotorsports.com/forum/Smileys/default/tongue.gif) Edit: just researched 2.7TT thermostat, and that is just a ridiculous amount of work for such a "simple" thing ![Tongue](http://nefariousmotorsports.com/forum/Smileys/default/tongue.gif)
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« Last Edit: March 09, 2017, 04:55:59 PM by KasperH »
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KasperH
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« Reply #24 on: March 09, 2017, 04:00:12 PM »
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Would knock cause head gasket failure?
Severe knock/detonation could cause that, yes ![Smiley](http://nefariousmotorsports.com/forum/Smileys/default/smiley.gif)
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nyet
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« Reply #25 on: March 09, 2017, 04:17:10 PM »
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Edit: just researched 2.7TT thermostat, and that is just a ridiculous amount of work for such a "simple" thing ![Tongue](http://nefariousmotorsports.com/forum/Smileys/default/tongue.gif) At least the 2.7t afterrun thermostat is "easy" to get to ![Smiley](http://nefariousmotorsports.com/forum/Smileys/default/smiley.gif)
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dokalanyi
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« Reply #26 on: March 10, 2017, 12:59:09 AM »
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Severe knock/detonation could cause that, yes ![Smiley](http://nefariousmotorsports.com/forum/Smileys/default/smiley.gif) I have some knock, but I wouldn't call it severe. But again, I don't know what severe is. Like 5 knock events in a 2k-6k pull severe?
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4ringpieces
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« Reply #27 on: March 10, 2017, 03:07:22 AM »
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Even slight knock events over prolonged periods can damage a headgasket
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TijnCU
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« Reply #28 on: March 10, 2017, 05:02:50 AM »
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Easy way to diagnose a faulty head gasket is to run the engine with coolant cap removed. If you see bubbles, for sure the hg is defective. If there is no bubbles, no guarantees ![Grin](http://nefariousmotorsports.com/forum/Smileys/default/grin.gif) I had an 8v that would pressurize the system, it held for 2 months and then it just gave out in one big cloud of steam and flooded cylinders...
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dokalanyi
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« Reply #29 on: March 10, 2017, 05:42:20 AM »
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Easy way to diagnose a faulty head gasket is to run the engine with coolant cap removed. If you see bubbles, for sure the hg is defective. If there is no bubbles, no guarantees ![Grin](http://nefariousmotorsports.com/forum/Smileys/default/grin.gif) I had an 8v that would pressurize the system, it held for 2 months and then it just gave out in one big cloud of steam and flooded cylinders... I heard bubbles just as I parked now. I heard a bubbling sound in the cooling system. Will check when I get home.
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