6.0l pushing coolant out degas cap at higher rpm and under load

[wjames]

i have a 05 6.0l that will leak coolant at the degas cap under a load only. checked system pressure and checked for combustion gas in system but cant find a reason for the leak. any ideas

[Aretoo]

First thing to do is try replacing your cap. Over time the caps can weaken and not hold the right amount of pressure causing them to leak. Personally I would only use an OEM replacement cap as there is some question about the quality of some of the aftermarket caps.

If you replace the cap and still have puking issues then you need to look at doing a pressure test. Look at this thread for making a coolant test gauge and what to look for.
Homemade coolant pressure gauge

[Korx]

Originally Posted by Aretoo

First thing to do is try replacing your cap. Over time the caps can weaken and not hold the right amount of pressure causing them to leak. Personally I would only use an OEM replacement cap as there is some question about the quality of some of the aftermarket caps.

If you replace the cap and still have puking issues then you need to look at doing a pressure test. Look at this thread for making a coolant test gauge and what to look for.
Homemade coolant pressure gauge

I and several other members here have the stant cap and haven't had any problems with it, I just wish it clicked when tightened.

Also to the OP if you need a pressure testing gauge I'd be willing to let you borrow mine.

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[wjames]

i have replaced with oe cap and pressure tested. it spikes to 17psi when pulling a load only. tested for hydrocarbons but doesnt change the fluid at all. not sure where to go with this

[Korx]

Any clue what your deltas look like?

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[dieselmatt]

Sounds that, even though your test strips say otherwise, you have blown head gaskets.

[91gt]

I just had to do my head gaskets. I was living in denial because my truck would do the same as what your sounds like it is doing. At the end of the day it was head gaskets, which I did by removing the engine and not lifting the cab at all.