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Yeah, pull the heater and dismantle it. Mark your cable connections so you can get them in the same place when you put it back together. You will probably find the heater core has a lot of debris plugging up the air passages especially near the bottom. A Scamp I had was plugged about a third the...

Sounds to me that the blend air door is stuck in the cold position.

Most caps now are designed for an overflow bottle. Your right, it's best to remove the cap when the engine has cooled down. You don't want a steam or hot antifreeze burn. The coolant should cover the rad tubes when cold.

Best mix is 50/50 water and antifreeze. Get yourself an aftermarket rad overflow bottle to connect to the overflow tube. Check for leaks or wet spots. Coolant expands when hot and will go into the bottle and will be drawn back into the rad when the engine cools down.

Up here in Winnipeg, Manitoba Canada (Winterpeg) I have always used 50/50 Prestone. I have also always used distilled water. A long time ago I heard this is better than tap water as there are minerals in the tap water.

Glad to help.

My '68 with 318 is 22X17.5 That's the original rad too.

Hi, It's your decision. Like the others said, If you don't like the heat turn up the ac OR roll down the windows and go faster. lol

If you get overheating at high speeds it could be that someone has removed the wire coil from the lower rad hose. This coil keeps the lower hose from collapsing at high speeds. Just a thought.