Possible cooling system problem
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Junior User
Joined: Aug 2010
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From: Texas
Possible cooling system problem
ok i did a coolant flush and then changed over to an ELC. after i did the change i believe that i overfilled the system because i was getting coolant coming out of the cap from time to time. i figured out that the fill lines on my degas bottle are wrong so i removed some coolant and i haven't noticed any coolant coming out of the cap any longer but i did notice something odd that concerns me, the system always seems to have pressure in it even when cold. none of my other vehicles do this but they are gas engines. it just seems strange that on a cold engine when i remove the degas bottle cap alot of pressure escapes and the coolant rises quite a bit similar to what it would do if the engine was hot. someone told me this is a symptom of an engine problem, that compression is getting in there but didn't really elaborate on what that meant. does anyone else s system do this or know if this is normal or do i need to investigate this further? any advice will be greatly appreciated.
Logistics Pro
Joined: Nov 2010
Posts: 3,673
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Okay, well on my system this morning acutally I removed the cap and it had no pressure, I never really pay attention acutally, just today I did.
Always does when hot.
I meant to ask..do you have any gauges? More or less a way to monitor ECT VS EOT?
Always does when hot.
I meant to ask..do you have any gauges? More or less a way to monitor ECT VS EOT?
Hotshot
Joined: Apr 2010
Posts: 19,055
Likes: 235
From: Saratoga Springs,UT
get some gauges like a scangauge Monitor ECT vs EOT SOON
change the coolant bottle cap
I keep my coolant leval 1/2 inch below the low mark on the coolant bottle
Park th truck nose down and pull he EGR Valve look for coolant in its chamber there should be none
Lots of things will cause puke start with the easy stuff first
did you have the issue befre you did the flush ??????????
It may have plugged the oil cooler with the flush it happens sometimeas did you use any cleaners at that time
change the coolant bottle cap
I keep my coolant leval 1/2 inch below the low mark on the coolant bottle
Park th truck nose down and pull he EGR Valve look for coolant in its chamber there should be none
Lots of things will cause puke start with the easy stuff first
did you have the issue befre you did the flush ??????????
It may have plugged the oil cooler with the flush it happens sometimeas did you use any cleaners at that time
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Junior User
Joined: Aug 2010
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From: Texas
i have gauges and all the temps are in line with eot and ect usually almost the same temp. usually 195-204 depending on outside air temps. i did replace the cap and yes i flushed with the degreaser (i forget the name) and then the vc-9 just like the how-to's posted here. it hasn't puked since i lowered the level of coolant and replaced the cap but i find it surprising that it would keep pressure once the engine gets cold say overnight etc. in fact i could let it sit several days and check it and there would still be pressure in the system.
Hotshot
Joined: Apr 2010
Posts: 19,055
Likes: 235
From: Saratoga Springs,UT
Mine will puke if to full of coolant too
I think that its OK for the system to have alittle residule pressure just meeans the cap is working as advertised
It sounds fine to me
just watch it close for a few sounds like it was a little full of coolant
for some reason on these 6.0s the coolant needs alot of room to expand and contract and the leval varies alot
I think that its OK for the system to have alittle residule pressure just meeans the cap is working as advertised
It sounds fine to me
just watch it close for a few sounds like it was a little full of coolant
for some reason on these 6.0s the coolant needs alot of room to expand and contract and the leval varies alot
Fleet Mechanic
Joined: Nov 2003
Posts: 1,372
Likes: 14
From: West Cornwall, CT
I would tend to be suspicious of having residual pressure in a cold system. This might be due to a slow leak either from the EGR cooler or head gaskets.
Recommend checking for combustion gasses in the coolant, just to be sure that there is no problem.
Lou Braun
Recommend checking for combustion gasses in the coolant, just to be sure that there is no problem.
Lou Braun
Lead Driver
Joined: Feb 2011
Posts: 8,241
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From: L.A. (Lower Alabama)
What part of an engine would normally keep pressure for several days? Nothing I can think of on the whole truck is that tight except the tires (and coolant system). it may be over pressurizing while running, but I don't thing anything is pressurizing it after shut down.
Last edited by Rusty Axlerod; Oct 23, 2011 at 05:26 PM. Reason: Add
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Hotshot
Joined: Apr 2010
Posts: 19,055
Likes: 235
From: Saratoga Springs,UT
if theres alot of pressure yes thats bad
but I would think alittle negative pressure from everything cooling down and contracting would be normal
but I would think alittle negative pressure from everything cooling down and contracting would be normal
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Hotshot
Joined: Apr 2010
Posts: 19,055
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From: Saratoga Springs,UT
Just went and pulled my coolant cap cold soak since friday night and NOTHING didnt sound like it pushed or pulled any air positive or negative pressure
I was wrong just thopught it may have very little but None
I was wrong just thopught it may have very little but None
Lead Driver
Joined: Feb 2011
Posts: 8,241
Likes: 155
From: L.A. (Lower Alabama)
Can you tell it's pressure for sure? A vacuum kinda makes more sence to me. Expanding when it gets hot then contracting when it cools......but it would even out unless there was some purging going on when hot, maybe it burps up some air? Just kinda thinking out loud here.
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