mgarblik |
03-08-2024 10:20 AM |
Quote:
Originally Posted by ta6point6
(Post 6490293)
So I had the 6.0 replaced in Avalanche in December due to spun cam bearing. So it started with a leaking upper radiator hose, no big deal tighten up the clamp. Then leaked again and took in to mechanic and freeze plug was loose. Keep losing fluid due to loose upper radiator clamp I thought. Temperature has been a tick above normal nothing in 240 range. What else causes pressure in coolant system while cold and cause leaking coolant in upper radiator hose?
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I can't explain your upper hose leak unless it's not the hose. Remove it from the neck and VERY carefully inspect the neck area which I suspect is plastic. If you don't find any defects in the neck or hose, try a constant pressure style hose clamp, (a spring clamp) vs a worm screw clamp. They generally work better on plastic necks. This would be an OE style clamp.
It is not unusual for a surge style reservoir to maintain pressure even cold. This is what an Avalanche would have, with the pressure cap on the plastic surge tank. I have seen them hold some pressure overnight. (small amount).
For peace of mind with your replacement engine, you might want to perform a combustion leak detection test on the truck. This is a kit you can buy with a color changing hydrocarbon detecting chemical you put in a tube and "sniff" the vapor on a hot engine in the surge tank. If there is combustion gas in the coolant, the dye will change from blue to yellow/light green. It is a foolproof test for a failed head gasket, cracked block or head. I will provide a link for the tool. NAPA and other real parts stores sell these.
Link for tester: https://www.amazon.com/Block-Tester-...A1810GNA3P38E9
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