After A/C Add On Engine Overheats Really Bad

66plyValiant said
very bad idea to run without thermostat, water circulates too quick to cool the back of the engine, can cause rear cylinder damage

nothing wrong with flex fans, but they definatly won't move the air a clutch fan will that has a proper thermo clutch on it

for the most part flex fans will keep a car nice and cool, but ma mopar put the parts that are on our cars for a reason; it worked and worked good

Yes, they did and you're right; engineers knew what they were doing.

I only ran the car without the 'stat when I first put it together to ensure I got all the water in the system, and all the air out of it. Car runs a 180 'stat now, mainly because I drive it until the first snow, and I like heat! LOL

I came from Corvettes and as you may know, they run hot, especially big blocks. If you run anything other than a clutch fan on a BB Vette you'll have cooling issues. Also, ALL the foam seals MUST be in place.

Only thing about my car is, with a 440 there isn't enough room between the WP and the radiator for the clutch fan. Like I said, my car runs cold with a flex fan and no 'stat. With a 180 'stat, the gauge will stay at the first mark on the stock temp gauge whether it's 90º out, traffic, red lights etc.

I think his problem is air in the cooling system. I suggest removing the 'stat and running the engine like that to be sure there's no trapped air.

George