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Problem solved! It wasn't the fan, or the aluminum radiator. It was just stubborn air in the system. Took forever to get it out. I finally lifted the radiator out of its cradle as far as I could and got the last bit of air out of it. Thanks for all the suggestions!

Yep! That was it. This thing was stubborn. Each time I drove it it would burp a little bit more. Finally got to the point where temp stayed around 190.

I think you hit the nail on the head with the "burp". I thought I had all the air out, but I was wrong. I raised and lowered the front of the car while running. It burped again and lowered radiator level 1.5" I topped it off and drove it again twice as far. Still running hot at 230 but didn't...

You may be right, but I think I'll try a few other tricks first. I see an awful lot of aluminum radiators out there that seem to be working just fine.

So it sounds like I should... 1. Make sure there no remaining air in the system. I've got plenty of good hills around here. I'll get it warmed up and park on a hill facing uphill. maybe do this a couple of times. 2. Get rid of the electric fan, go back to factory fan. I don't have a clutch on...

The hole in the thermostat thing is a new one to me. This is to let trapped air from the engine to get into the radiator when the thermostat is closed? Correct? If that's the case, I'm not sure it would help as I verified the thermostat was open before I drove around the neighborhood. That is to...

Yes! It's a puller. May not be pulling enough, but I would think that at speed it wouldn't matter. The natural airflow through the system would cool it even without a fan at all.

Well, no! Not quite. I replaced a system that wasn't working for one that I was told should work. I might put the factory blade back on though.

Yes, I'm starting to question that fan myself. Once I'm absolutely sure I have all the air out of the system, I'll go back to the factory fan to see if it makes a difference. Summit makes a shroud for this radiator, but it's too small for the factory fan. I guess I could make my own, but I'd...

I was wondering about the lower hose. It's not collapsed when I check it, but it might be possible that it collapses at higher RPM. I'll check that! If that doesn't pan out, I might try going back to the factory fan. Thanks!

Fill cap is above engine and I have a surge tank. I'll check on the air. Maybe I'll park on an hill facing uphill.

There's no question that a shroud is beneficial for stop and go traffic. They actually serve to hinder airflow at speed. As I stated in my original post, I have the opposite problem. I have no issue when just idling. My issue is when I am at speed. There's plenty of air flowing, but the car is...

About 3 weeks ago my OEM radiator sprung a leak. I have never had a cooling problem until then. Even on hot days, the 360ci in my '66 Belvedere rarely went above 190 degrees. I decided to replace the radiator with a brand new universal fit aluminum cross-flow radiator from Summit. I also...