Thanks for the reply. Pressure test sounds great. I have an air compressor now I need something to go over the resivoir fill to allow me to put pressure into the cooling system. Any ideas? I will assume that 10 - 15 psi should be enough.

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Stable:
1973 450sl
1978 red diamond ice vette
1975 steel blue convertable vette
2002 steel blue dakota quad.