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I could spend the time digging through some 80s tech manuals I have, but I won't. I've been filling cars from this era and long before for over 30 years this way, and it works. Underfilling would be gallons...this is just a few quarts in a several gallon system. Letting the rad cap, in its set...

The over flow won't do much until you shut it off hot. It'll pull coolant into the radiator if it needs it...it takes a few drive cycles to get it leveled out then might see some move into it once it gets to be summer time heat then pull it back in once it cools off. The radiator cap is pretty...

Yup let the over flow fill it where it wants it. These do take a very long time to heat up. Not sure if you know but the other point of having the correct lb cap is to raise the boiling point of the coolant. Something to think about especially if you live in a high elevation. Sent from my...

Oh ok there's your problem then...it needs room to expand. Gotta let it find its full. The cap does that. Since you fill it to the top it will push out the extra...explains the tight hoses too. Drop it 4 5 inches below the top and keep the over flow full to cold. Sent from my SM-S906U using...

Ok. I hate to assume either were good...but kinda have to. I have little faith in some parts stores. I'd look where the cap seals in the top of the radiator...see if it matches up with the cap seal and depth. Does the upper hose get tight still? And yes you can over fill it but the cap is the...

I'd say get a new radiator cap on it. I can't remember the pressure though. I think 14.5...but I'd have to look that up. The fill point is a little above the heater core return. Sent from my SM-S906U using Tapatalk