When I 1st got my car, I didn't realize how hot it would get till I started taking longertrips and getting caught in traffic.
As a matter of fact, my 1st year at Carlisle, I sat just outside the fairgrounds with the hood up due to the heat
I trailered the car there, but what a bummer.
After that I decided no more, but I went through alot.
I finaly figured that after switching to an aluminum rad, running all water, buying those fancy additives, nothing worked.
The car was truly cooler on the freeway, meaning air flow was my big problem.
I was running a mechanical fan with an electric pusher - no help.
I went to a single electric puller with a full shroud - no help.
For anyone keeping score, I've replaced evrything almost twice.
I then started to notice CFM ratings for fans, and the ones I was buying had lower ratings to match the cheaper costs.
In a last ditch effort, I bought a dual electric fan set-up, rated at alot of CFM, but also required 50 amps alone to run. Now I also had to invest in a high amp alternator.
But now, I have NEVER run over 180, and I bought a big enough alt to power any other potential electric items down the road. As a matter of fact, this was my 2nd year driving to Carlisle with out any problems, as well as many local cruises and shows.
I hope this shines a little light, as I was having nonstop issues before as well, and in the end, for some reason, I just could not flow enough air, it had nothing to do with the rad, volume by the pump, what kind of water, collant or additive, what thermostat, high flow, regular or none. I tried "blocking" off the hot air from returning in front of the rad.... I mean I tried all of the regular tricks, but nothing seemed to work.