Anitfreeze boiling threw cap??
New User
Joined: Mar 2000
Posts: 12
Likes: 0
From: Escondido, CA
Just because it blows coolant out the cap DOES NOT MEAN IT HAS A BLOWN HEADGASKET! How hard is that to understand. The coolant flash boils because of the egr, take the coolant to a minimum or get an SCT and turn the EGR off! It's not rocket science folks! 
Former Vendor
Joined: Mar 2004
Posts: 4,362
Likes: 3
From: Hendersonville, NC
Originally Posted by superf350
Just because it blows coolant out the cap DOES NOT MEAN IT HAS A BLOWN HEADGASKET! How hard is that to understand. The coolant flash boils because of the egr, take the coolant to a minimum or get an SCT and turn the EGR off! It's not rocket science folks!
Yes, coolant puking can be caused by either the EGR cooler OR the head gaskets, but if it is the EGR cooler, unplugging the EGR will have absolutely no effect on the problem- only blocking exhaust flow into the cooler or replacing the cooler will remedy the problem. The cooler (and corresponding hot exhaust pressure) is before the valve- disabling the valve does nothing.
Statistically, about 75% of the coolant problems I have seen ARE head gaskets: however, just because they are leaking under load does not mean they are blown; they require replacement eventually nonetheless.
Former Vendor
Joined: Mar 2004
Posts: 4,362
Likes: 3
From: Hendersonville, NC
Originally Posted by superf350
I'm pretty sure the SCT can close the egr. I will have to find out for sure. NBTW I said have it turned off not unplug. Big difference! 
New User
Joined: Mar 2000
Posts: 12
Likes: 0
From: Escondido, CA
Think about this for a second if the egr is closed so what if coolant is going through it. There is no hot gasses going through the egr because it's closed. I think we are talking about two different things. I'm talking about flash boiling because of the hot gasses passing through the egr causing the coolant going through the egr cooler to boil. If there is no longer any hot gasses passing through the egr then there should be no more flash boiling.
Former Vendor
Joined: Mar 2004
Posts: 4,362
Likes: 3
From: Hendersonville, NC
Originally Posted by superf350
Think about this for a second if the egr is closed so what if coolant is going through it. There is no hot gasses going through the egr because it's closed. I think we are talking about two different things. I'm talking about flash boiling because of the hot gasses passing through the egr causing the coolant going through the egr cooler to boil. If there is no longer any hot gasses passing through the egr then there should be no more flash boiling.
See this diagram for reference.
I compose my own SCT calibrations, and I keep the valve shut via the desired EGR position and feedforward tables in ANY calibration I write- yet I still managed to melt down two coolers before eventually cutting and welding the uppipe to remedy the issue.
Last edited by PSD 60L Fx4; Jan 3, 2006 at 10:20 PM.
New User
Joined: Mar 2000
Posts: 12
Likes: 0
From: Escondido, CA
You are absolutely right now my question would be that with it shut the airflow would not actually go through the cooler? Granted you'd still have hot exhaust gasses in that general area but it wouldn't flow through.
Former Vendor
Joined: Mar 2004
Posts: 4,362
Likes: 3
From: Hendersonville, NC
Originally Posted by superf350
You are absolutely right now my question would be that with it shut the airflow would not actually go through the cooler? Granted you'd still have hot exhaust gasses in that general area but it wouldn't flow through.
Keep in mind that dynamic heat transfer through pressurized, extremely heated exhaust gas is ridiculously rapid, especially when there is no solid barrier to act as a heat sink and at least partially absorb fluctuations in temperature.
Last edited by PSD 60L Fx4; Jan 3, 2006 at 10:42 PM.
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Joined: Jul 2004
Posts: 375
Likes: 0
From: W. Philly Burbs
What if I changed to that non-water based coolant? i cant find the website or the name of it (even though i saved it to my favorites, i say its because PSU won orange bowel and im still up at 130 haha) but would this watwerless coolant help? i understand it boils at a higher temp? justa question............i dont like covering up problems (such as a bad EGR or EGR cooler or headgaskets)
Junior User
Joined: Oct 2006
Posts: 71
Likes: 0
From: Airdrie, Alberta
Dug this up doing some searching. If I had an egr coller issue, lets say slight coolant leak internally, but mostly puking. Would blocking the exhaust and disabling the egr valve be enough to cure the issues (lets say head gaskets are fine) or would the cooler have to be replaced/bypassed to repair the coolant leak as well?