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Old 12-04-2018, 03:22 PM   #1 (permalink)
BurbanBurban
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6.5 Coolant Dumps Out Overflow Res

Hello again, 1994 6.5 Suburban, coolant starts gushing out of coolant res tank after truck sits running for around 15 to 20 mins. The temp gauge said below 165, but it was gushing hot out of the coolant overflow tank little hose, i turned the truck off and turned it back on to ACC and the temp gauge went up to around 190? (See pic)

Any idea what is going on here?? Thermostat broken or something? Thank you.

Picture: http://prntscr.com/lqqlwv

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2006 Suburban 1500 Z71 5.3L
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Old 12-04-2018, 05:02 PM   #2 (permalink)
KRRZ350
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Thermostat could be clogged/sticking, air pocket, weak water pump. Definitely start with the t-stat. After you take it out, put it in a pot of hot water on the stove and see if it opens, take it out and see if it closes. Do that a few times and see what happens. If it hasn't been mentioned to you already, a dual t-stat upgrade is in order. Now's a good time as you'll have it apart.

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Old 12-04-2018, 07:18 PM   #3 (permalink)
dieselolds
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When did this problem occur?Was it a sudden thing?Any hot air coming from the heater ducts inside?
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1996 GMC Sierra ext.cab Z71....with new genuine GM 6.2 660 short block,4L80E/6.5TD cylinder heads,DS4 5521S,82' 6.2 rocker arms,acdelco TP1069/Racor 20S fuel filters,4" diamond eye exhaust,3.73 G80 locker,stanadyne 37818 injectors

1996 Chevy K1500 Z71.....with '99 6.5 506 goodwrench van engine,88-93 6.2 diesel Napa y-pipe,'87 700R4,acdelco TP630F/Racor 20S fuel filters,Bosch non-turbo injectors,stanadyne blue tag 5088

1993 Chevy K1500 Z71...with 97' 6.5 TD 506 block,82' 6.2 rocker arms,stanadyne 37818 injectors,stanadyne blue tag 4911,DSG girdle,reman 700R4,Banks boost/pyrometer gauges,acdelco TP1069/TP943 fuel filter system,4 diamond eye exhaust/2 piece crossover

2008 Mercedes Benz E320 3.0 V6 turbo diesel

2013 Volkswagen Passat 2.0 TDI
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Old 12-04-2018, 10:23 PM   #4 (permalink)
BurbanBurban
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Quote:
Originally Posted by dieselolds View Post
When did this problem occur?Was it a sudden thing?Any hot air coming from the heater ducts inside?
Its been a thing since i got the truck. This truck is a work in progress, i knew it leaked coolant but did not know where from, so i put a water bottle on the coolant tank hose. And i am pretty sure it does not blow hot air out of the heater. Or cold, but ac might need recharge.

But anyways, heater not blowing hot air means?
Thank you

Edit: also, my local parts store only has Murray Plus or Gates thermostat... i know ac delco is best.. what temp do i want for the thermostat, 180, 194 or 195? Or should i try a different auto store?
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1994 GMC Suburban K2500 6.5TD - Stock - PMD Relocated Behind Bumper - 211000 Miles - Work in Progress

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Last edited by BurbanBurban; 12-04-2018 at 10:29 PM. Reason: More info
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Old 12-05-2018, 01:51 AM   #5 (permalink)
redpepper
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Quote:
Originally Posted by KRRZ350 View Post
Thermostat could be clogged/sticking, air pocket, weak water pump. Definitely start with the t-stat. After you take it out, put it in a pot of hot water on the stove and see if it opens, take it out and see if it closes. Do that a few times and see what happens. If it hasn't been mentioned to you already, a dual t-stat upgrade is in order. Now's a good time as you'll have it apart.
Hi you could have

a headgasket gone
pressure going into water system
or worse still a crack in head
or block
Anti freeze in it ?

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Old 12-05-2018, 03:51 AM   #6 (permalink)
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I’m leaning toward a head gasket and sometimes you’ll see guys reusing the head bolts over which is a no no with this type of engine.Also blowing cold air from the ducts inside with the controls working properly means a blown head gasket,warped cylinder head or stretched head bolts or a combination of all three in many cases.

I just had a 04 Sebring 2 weeks ago that was puking coolant up through with no heat inside the car.The cylinder head was warped and had to be resurfaced.It had multi layer steel head gaskets so no damage to those or the block surface.But .008” had to be removed from the cylinder head surface.All is well now with new gaskets,head bolts and cylinder head gone through.

Your engine won’t have multi layer steel head gaskets from the factory although a company called cometic makes them now in different thicknesses.
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1996 GMC Sierra ext.cab Z71....with new genuine GM 6.2 660 short block,4L80E/6.5TD cylinder heads,DS4 5521S,82' 6.2 rocker arms,acdelco TP1069/Racor 20S fuel filters,4" diamond eye exhaust,3.73 G80 locker,stanadyne 37818 injectors

1996 Chevy K1500 Z71.....with '99 6.5 506 goodwrench van engine,88-93 6.2 diesel Napa y-pipe,'87 700R4,acdelco TP630F/Racor 20S fuel filters,Bosch non-turbo injectors,stanadyne blue tag 5088

1993 Chevy K1500 Z71...with 97' 6.5 TD 506 block,82' 6.2 rocker arms,stanadyne 37818 injectors,stanadyne blue tag 4911,DSG girdle,reman 700R4,Banks boost/pyrometer gauges,acdelco TP1069/TP943 fuel filter system,4 diamond eye exhaust/2 piece crossover

2008 Mercedes Benz E320 3.0 V6 turbo diesel

2013 Volkswagen Passat 2.0 TDI

Last edited by dieselolds; 12-05-2018 at 04:01 AM.
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Old 02-11-2019, 12:31 PM   #7 (permalink)
redpepper
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Quote:
Originally Posted by dieselolds View Post
Im leaning toward a head gasket and sometimes youll see guys reusing the head bolts over which is a no no with this type of engine.Also blowing cold air from the ducts inside with the controls working properly means a blown head gasket,warped cylinder head or stretched head bolts or a combination of all three in many cases.

I just had a 04 Sebring 2 weeks ago that was puking coolant up through with no heat inside the car.The cylinder head was warped and had to be resurfaced.It had multi layer steel head gaskets so no damage to those or the block surface.But .008 had to be removed from the cylinder head surface.All is well now with new gaskets,head bolts and cylinder head gone through.

Your engine wont have multi layer steel head gaskets from the factory although a company called cometic makes them now in different thicknesses.
I have renewed head studs on 1 rebuild done
two more and
not bothered been fine
but you have too seal the threads with each bolt on assembly

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Old 10-01-2019, 06:26 PM   #8 (permalink)
redpepper
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Quote:
Originally Posted by redpepper View Post
I have renewed head studs on 1 rebuild done
two more and
not bothered been fine
but you have too seal the threads with each bolt on assembly

Sent from my SM-G965F using Tapatalk
These 6.2 heads or 6.5 dont warp that much skiming is not rec
Your problem maybe head bolts threads sealant
Remove each one clean threads re seal torque down to proper setting
Change head gasket while you at it use felpro head gaskets

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