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post #1 of 24 Old 09-21-2013, 11:30 AM Thread Starter
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getting a coolant whiff in the cab

so recently i have been noticing a coolant smell in the cab when my egts reach about 800 degrees. notice it more so when going up hill. also my degas bottle neck seems to have sucked itself in leaving the cap at a angle. my temp gauge stays at the operating temp does not move and not white residue around the degas bottle.

Its neither good nor bad, only thinking it makes it good or bad.
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post #2 of 24 Old 09-21-2013, 11:46 AM
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so recently i have been noticing a coolant smell in the cab when my egts reach about 800 degrees. notice it more so when going up hill. also my degas bottle neck seems to have sucked itself in leaving the cap at a angle. my temp gauge stays at the operating temp does not move and not white residue around the degas bottle.
You need to get a monitor on your truck ASAP so you know what's really going on with it. The stock guages are "idiot lights with needles". In most cases they dont move out of the normal range until after there is a problem.

Once you get a monitor, check ECT, EOT, and check for DTCs. If your degas bottle is imploding, you have a problem that needs to be resolved ASAP. My guess is EGR cooler flash boiling coolant which is then hot enough to deform the degas bottle. EGR coolers get starved for coolant when the OEM oil cooler plugs on the coolant side.

Also, do you have the latest engine flash for your truck? It's the one the activates the VGT at idle to "sweep" the turbo of soot. This flash also has the parameters to trigger a check engine light (wrench symbol) when the EOT and ECT are more than 15f under steady crusing conditions.

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post #3 of 24 Old 09-21-2013, 12:39 PM Thread Starter
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Originally Posted by skanj0 View Post
You need to get a monitor on your truck ASAP so you know what's really going on with it. The stock guages are "idiot lights with needles". In most cases they dont move out of the normal range until after there is a problem.

Once you get a monitor, check ECT, EOT, and check for DTCs. If your degas bottle is imploding, you have a problem that needs to be resolved ASAP. My guess is EGR cooler flash boiling coolant which is then hot enough to deform the degas bottle. EGR coolers get starved for coolant when the OEM oil cooler plugs on the coolant side.

Also, do you have the latest engine flash for your truck? It's the one the activates the VGT at idle to "sweep" the turbo of soot. This flash also has the parameters to trigger a check engine light (wrench symbol) when the EOT and ECT are more than 15f under steady crusing conditions.
any suggestions on what scan gauge to get?

the egr cooler was my thought as well. also i went to inspect to the degas bottle also noticed a hump near the mounting bracket.

no i do not have the latest flash for it.

Its neither good nor bad, only thinking it makes it good or bad.
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post #4 of 24 Old 09-21-2013, 07:18 PM
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any suggestions on what scan gauge to get?

the egr cooler was my thought as well. also i went to inspect to the degas bottle also noticed a hump near the mounting bracket.

no i do not have the latest flash for it.
Cheapest/simplest is a Scan Gauge II. It will also read and clear codes. Another good option is the EDGE CS/CTS, but it will cost more. It also has the ability to add an EGT and other temp and pressure sensors, whereas the Scan Gauge is not expandable.

The degas bottle has lots of different curved areas so that's not in itself a concern. The cap should almost parralell to the ground - but a little high toward the front of the truck. There are lots of photos of degas bottles on this site for reference.

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post #5 of 24 Old 09-23-2013, 04:26 PM Thread Starter
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i should also say that my degas cap smells like burnt coolant. is this also a symptom of a bad egr and oil cooler?

Its neither good nor bad, only thinking it makes it good or bad.
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post #6 of 24 Old 09-23-2013, 07:38 PM
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i should also say that my degas cap smells like burnt coolant. is this also a symptom of a bad egr and oil cooler?
When the oil cooler fails (other than just plugging-up) it tends to release oil into the coolant, and the oil then ends up in the degas bottle, as oil floats on water. The reason this occurs is because the oil system on these trucks operates as high as 100 PSI when cold, versus the cooling system which operates around 3 - 7 PSI normally.

If the EGR cooler is not getting a sufficient amount of coolant flow the coolant can flash boil and then return the super heated coolant back to the degas bottle. I suppose this could result in burnt coolant, though I've never heard of such a thing. Is there any fuel in the coolant? Is the degas bottle puking? Are you losing any coolant?

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post #7 of 24 Old 09-23-2013, 07:56 PM Thread Starter
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When the oil cooler fails (other than just plugging-up) it tends to release oil into the coolant, and the oil then ends up in the degas bottle, as oil floats on water. The reason this occurs is because the oil system on these trucks operates as high as 100 PSI when cold, versus the cooling system which operates around 3 - 7 PSI normally.

If the EGR cooler is not getting a sufficient amount of coolant flow the coolant can flash boil and then return the super heated coolant back to the degas bottle. I suppose this could result in burnt coolant, though I've never heard of such a thing. Is there any fuel in the coolant? Is the degas bottle puking? Are you losing any coolant?
i don't see any fuel in the coolant.

sunday when i was doing some a fluid check i did notice some coolant residue around the cap. none the less the coolant residue was there. i believe i am loosing coolant when i fill to the line on the degas bottle the coolant drops say about 1/2 inch from the fill line and stays there. i see no leaks under the truck or any white smoke coming out the exhaust.

Its neither good nor bad, only thinking it makes it good or bad.
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post #8 of 24 Old 09-24-2013, 09:46 AM Thread Starter
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Well I checked my egr valve did not see any wet soot in the intake or on the valve itself. Also I took some pics of my degas bottle in the last pic the coolant stays at the level and does not move from there.

also wanted to add on the way home today from work the fan seemed to get louder as the rpms went up. can the fan go into limp mode?


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Its neither good nor bad, only thinking it makes it good or bad.

Last edited by UserError; 09-24-2013 at 02:54 PM.
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post #9 of 24 Old 09-24-2013, 05:31 PM
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Originally Posted by UserError View Post
Well I checked my egr valve did not see any wet soot in the intake or on the valve itself. Also I took some pics of my degas bottle in the last pic the coolant stays at the level and does not move from there.

also wanted to add on the way home today from work the fan seemed to get louder as the rpms went up. can the fan go into limp mode?


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Something is really wrong with your degas bottle. It looks really swollen. You need to check coolant system pressure. I think you may have head gasket issues that is causing extreme pressure in the degas bottle, and for whatever reason the cap didn't vent the pressure. You also need to get an ECT & EOT reading ASAP.

The fan has a variable speed drive and will operate at different RPM as commanded by the PCM.

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post #10 of 24 Old 09-24-2013, 09:41 PM Thread Starter
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Originally Posted by skanj0 View Post
Something is really wrong with your degas bottle. It looks really swollen. You need to check coolant system pressure. I think you may have head gasket issues that is causing extreme pressure in the degas bottle, and for whatever reason the cap didn't vent the pressure. You also need to get an ECT & EOT reading ASAP.

The fan has a variable speed drive and will operate at different RPM as commanded by the PCM.
well i am going to make cooling pressure tester and do some test to see if its my gaskets or not. is it best to the cooling system when the engine is cold? from what i searched that slow build of pressure to 10 psi is acceptable and a rapid increase of pressure past 16psi is bad. did i read that correctly?

Its neither good nor bad, only thinking it makes it good or bad.
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