Originally Posted by Jesse@MBRP
Take the truck out and get it up to temp and flog her real good. Then immediately pull over and open the cap just enough to relieve the pressure built up.
Post up how many seconds it hisses for. Anything more than 1-2 seconds and you may have the same problems as me.
I like to check the pressure when I get home, and when I get out of the truck I usually smell coolant. When I loosen the cap, it takes a bit to relieve pressure, and there are also bubbles I can see coming up when the engine is running. But I don't think the bubbles are a problem. I have a coolant combustion gas tester, I will test it today to see if there is C02 present. I REALLY HOPE NOT
I thought my cap was loose when I first started smelling it, but that isn't the problem.