Does This Debunk the "Coolant Can Flow Through the Radiator Too Fast" Idea???

slantsixdan said

A lower-than-spec pressure cap is a band-aid for a fragile, leak-prone system.

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For sure. I used to have a 62 Falcon with a 200 cid six cylinder. After I got it I drove it around for a few months without any issues. It never got hot, but I noticed the seal on the rad cap was gone, and had probably been gone for years. I'm sure it was not putting the system under any pressure at all.

I put a new rad cap on and promptly blew the upper rad hose off the next time I drove the car any significant distance. Weakness found! Turns out it was just a worm clamp that wouldn't tighten up anymore.