4 core radiator and thermostat...

[67ChevyRedneck]

Looks like my A/C install in gonna take a hike in price again. I have a 3 row radiator in my truck with vintage air A/C now. I drove the truck on a 90 mile round trip yesterday and even on the interstate with the A/C off the truck was running at 200 and as soon as I turned the A/C on it jumped to 210 degrees. I'm not so much worried about my motor running that hot, but I don't want to fry my 700R4. It jumped to 210 running down the highway at 70 mph... not good! Although, it never did get above 210... BUT my engine started pinging up hills when the temp was at 210, no more pinging when it dropped to 200. My timing is set at 12 degrees BTDC.

On my way back I found a super nice 69 or 70 (can't remember now which) swb fleetside with factory A/C and automatic for sale in Easley SC, on Hwy 123. I popped the hood and it had an enormous radiator. The truck looked very stock and original under the hood, so the 4 core is much bigger than the 3 core? It also looked like it had larger holders as well, the clamps at the top and the bottom.

Autozone sells an automatic one for about $190.

People with A/C... are you running a 4 core? Do you have an automatic (big heat adder!)

Also, what thermostat are you running. I think mine is a 185. Thinking about bumping it to 190.

Is my timing maybe a little high too? Truck runs great when it's running "cool."

Electric fans will also be an option, but I'd prefer to have a proper capacity radiator first and not use the electric fans as a band aid.



Also, it was about 102 outside yesterday!