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I’m thinking of trying this to clean out my cooling system on my 37 business coupe.
I recently replaced the thermostat and upper hose and everything else in the system seems to be working fine but it still has a tendency to run hot in traffic and at idle. Any thoughts or experiences with this product?
Thanks

Thermostatic shutters working?

37 business coupe doesn’t have shutters.

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I have used it and found it works well. Cleaned out debris and car runs cooler. Be sure to use the correct product. Don't use evapo rust but another product made by them specifically for the cooling system, believe it's called thermocure

I have used Evapo-Rust extensively with excellent results.
However, I have not used it on the coolant passages of an engine block or in a radiator.

Have you flushed the cooling system? If so is it clean and does it flow well?
The manual lists the radiator for the Six as having "Gravity flow new, 38 to 41 gallons per minute."
Have you measured how hot it is when you say it "has a tendency to run hot in traffic and at idle."? The thermostat you put in was the correct 147 degree based on the part number.
You haven't described it as hot enough to boil over.

I'm going to try the Thermocure here shortly (1954 Panama). I'm running warmer than I should be and my radiator has been professionally cleaned, new thermostat, etc. Block has been backflushed but nothing else. I'm curious to see what the Thermocure does.

Planning on running a Gano filter or something similar to pick up all the debris. And I also plan to clean the filter several times throughout the treatment.

The product you want is Oxalic acid (If no Aluminum present in the system)

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The dash temp gauge will be pegged at 212,the infrared thermometer reads 214 across the cylinder head and the radiator temp is at 208 and the radiator will boil over. I’ve yet to flush the system.

Yup,that's running pretty warm.

Have you checked your the timing? Late time will made engine run hotter than normal.

Overheating issues are challenging to resolve. Your car doesn't have the same 288 engine that 49 has but these are the things I have done to my car that finally solved the problem with overheating. Replaced the radiator, radiator cap, hoses, fan belt, installed an aftermarket temp gauge, flushed the block, inspected and tested the thermostat, installed a pusher 12vdc fan in front of the radiator (powered by a separate battery), replaced the head gasket that upon removal I discovered it was leaking at one cylinder. All of this helped control the temperature, but the engine still ran too hot in stop and go traffic. Finally, Last month I installed a shutoff valve on the heater hose coming out of the top of the block. The valve prevents hot coolant from circulating through the heater core and returning to the water pump and bypassing the radiator. During test drives in Texas 95F afternoons the engine now indicates 190-195F at 50 mph, and 210F at stop lights without the aux fan running. I am also considering fabricating a fan shroud.