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Ok so here's a little puzzle. For the longest time since I've installed this rad I've had a leak on the passenger side where this filler neck is. Being that the 02 wrx already has a filler neck for the cooling system I bought another radiator cap to cover the new neck on the radiator. If the car is driven lightly it doesn't seem to leak but hitting boost and 5,000+ rpm is when I see coolant in this area. It was never a huge issue until I fixed my boost leak bur now it seems there is enough pressure in the cooling system that it leaks more from all the pressure. Is it possible the radiator cap valve is opening under pressure shooting fluid through the filler neck return line on the radiator? That's what it looks like but then again I could be wrong. Anybody got any ideas on what it could be and a solution?
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