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so where does the coolant go when the engine warms up? and what about the radiator cap?
there is a vent hole in the filler cap just like the stock cap on the expansion tank. it lets the fluid vent out into a catch can if it gets hot enough, then when it cools back down, the vacuum sucks it back into the system.
Im just letting mine vent to the ground just like the way the stock expansion tank does. If you look on the tank near the stock radiator cap you can see a black rubber line that goes down and dumps the overflow to the ground.
then you hot tank them and it removes all the drease/oil/dirt/sludge but still looks less than awesome. I dont think i have any pictures of this stage but its just bare metal but its still got stains and things on it.
but then you throw a little bit of paint on the nice clean metal and you get this:
Hey, I'm putting a solid 216HP down, and you never gave me a ride in that car. I think we need to hunt your traitor *** down, but for now we will let you not drive your 3.0