Installed a new coolant cap..now I have a coolant leak.

[carter4612]

About 3 days ago i installed a new stant coolant cap. I replaced the old one for piece of mind. When unscrewing the old one I could barely hear any pressure releasing and I can definately hear the pressure realease with the new one so that leads me to believe the old one was bad. After the first day of being installed I came outside and noticed about a 4" x 4" area of coolant almost directly under the motor...maybe a little to the right. I crawled under the truck and checked and found nothing wet or running. I dont even notice any coolant out of the degas bottle, etc. Its been 2 days and I have been checking the truck every few hours and it doesnt leak a drop throughout the day or when its hot...only overnight. This leads me to believe its a "cold" leak from the system now having pressure where as it didnt before. Any input? I crawled under the truck today and it was dry but there appeared to be a small amount of white residue on the lower radiator hose where it goes back into the motor? maybe an o-ring? Im going to check again in the morning for any wet areas, specifically around that hose.

[dazed01]

Go rent a coolant system pressure tester from autozone and pressurize the system to see where the leak is coming from.

[04hdfatboy]

You probably need the updated lower radiator hose that has a dual o ring design.

[carter4612]

Well that's what I thought until this morning. The upper radiator hose is the new style...the lower the old style. However this morning when I looked under the truck I could see a small amount of coolant running down the smaller diameter hose just above the lower radiator hose. Looked up top and nothing is wet. Still trying to track it.

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[amb82]

It could be your upper hose leaking. It leaks down through that area to. I had the same problem on both my 6.4's. I had to replace both upper and lower hoses with the updated double o ring design and been problem free since. Ordered mine from tasca parts. A bit cheaper than the dealer


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[carter4612]

the upper hose is the new style and the lower is the old style. and to my surprise there wasnt a drop of coolant on the concrete this morning. it sat in the same place from 8am yesterday until 8am today and not a drop...i checked on it almost every hour. one of my buddies says sometimes his will leak a few drops when its very hot out. we have had abnormally hot temps here the past few days...100+. could this be a cause?

[amb82]

When mine leaked it was always once the truck cooled down and sometimes it would leak and sometimes it would go days with out leaking


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[carter4612]

UPDATE~!

Finally found the leak....the leak is coming from the horizontal EGR cooler. The coolant hose that comes off of it is leaking...running down the hose and onto the frame the the cross member and dripping off directly under the motor and the tranny. I have my Sinister EGR delete at home so I guess I better get started getting these damn coolers off.