if you do overfill , especially if you keep doing it , it builds a lot of pressure that might not otherwise have happened — until the cap vents at rated psi . Especially after you shut it off , latent heat in heads may boil locally at exhaust valve . Its up near 240 there at normal pressure cap psi ( a function of that psi obviously ) But if a nice big air space the air compresses in air volume , pressure cannot rise enough to lift cap . Like expansion tank on your home heat. In some ways better than catch bottle , they go to max pressure every time , spits out st max psi then draws back in , cycling all the hoses etc to 15+ psi in a modern car . That is all about smaller radiators , fewer rows running hotter to throw away same btu . Not a favor they did you! Two anecdotes , bro in law, 2013 jeep hemi , new water pump , radiator , thermostat etc catch can design . Constantly overheating , 3000$ dealer dance over a year + Still did it Fed up . I have the car . Ed and I pressure tested ( thinking head gasket) to 18 psi . Ed saw a tiny jet of water coming out of a 1/2” plastic elbow where water goes into heater core under hood . Had a longitudinal crack from new , at mold line , down one side . We cut off the elbow with hack saw put hose on straight, fixed! So every time he stopped pressure went up , this spit out then closed again . After a month overheat. Due to catch can design cycling . #two : 67 Dart slant six on overnight ferry to Canada vacation , waiting in line to board , my “rebuilt “ radiator split at solder seam around tank ( be careful of this failure , bozo dirty solder workmanship under pretty black paint ) V8 radiator I put in , Puking out my coolant, hot day , Steam out of hood in the line i loosened cap slowed to trickle. 2000 mile trip no issue no rad pressure . At all Hmmm Temp fine Did same thing in 1965 on 57 D500 dodge 325 , blown head gasket , made it thru winter , no $ to fix. Steam re condenses in that air space It’s a good thing!!!!! On May 12, 2025, at 10:50 AM, dplotkin@xxxxxxxxxxxxxxxxxxxxxxxxx wrote: -- For archives go to http://www.forwardlook.net/300-archive/search.htm#querylang --- You received this message because you are subscribed to the Google Groups "Chrysler 300 Club International" group. To unsubscribe from this group and stop receiving emails from it, send an email to chrysler-300-club-international+unsubscribe@xxxxxxxxxxxxxxxx. To view this discussion visit https://groups.google.com/d/msgid/chrysler-300-club-international/6724F703-B9CC-4E31-AF81-7A7E78A76DC2%40gradyresearch.com. |
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