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30 Closed Cab PU · 10-06-2019, 12:13 PM

Have been through this myself.

You can do the block and radiator separately, or do them with as an intact cooling system.

When doing it as a system or when doing the radiator by itself, do not use much pressure, Model A Radiators are high volume low pressure, and you can destroy a radiator quickly, especially if it is older/weak.

You may want to consider at treatment of Dawn dishwashing soap 1st to insure the cooling system is clean of oil/grease. Typically happens from someone over greasing an original style water pump. Do this 1st especially if using rust911 or thermocure, these do not remove grease/oil.

Then a treatment or 2 of Rust 911, or thermocure. These only go after rust/scale, and do not affect metal/rubber/plastic/etc. surfaces, so are very safe to use.

Or you can use white vinegar. But if it develops a leak and gets on paint, can cause paint damage. If you do not have a leakless water pump, vinegar can flush out the grease in the water pump, and it leaks all over the engine compartment if you treat by running the motor. It alos may go out the hood louvers and get on the car exterior. With white vinegar you must do a final treatment of water/baking soda to neutralize the vinegar that has microscopically imbedded into the cooling system internal surfaces.
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You can treat the block and radiator separately, or together as a complete cooling system.

If treated together, add the treatment, run the car on the road for up to a half hour or so for a couple of days, up to a couple of weeks. Drain, back flush through the lower radiator hose up through the radiator through the block and out the block coolant inlet. If using white vinegar do the water/Baking soda treatment.

If doing separately you can block the block inlet and the radiator outlet and fill and let it sit. Or you can rig a circulating pump on a timer to circulate every so often for days. Again a treatment of water baking soda if using white vinegar.

When completed, add a Gano upper coolant hose filter to keep future crud out of your radiator.

10-06-2019, 12:13 PM	#2
30 Closed Cab PU Senior Member Join Date: Aug 2018 Posts: 2,332	Re: BackFlushing Radiator and Engine Have been through this myself. You can do the block and radiator separately, or do them with as an intact cooling system. When doing it as a system or when doing the radiator by itself, do not use much pressure, Model A Radiators are high volume low pressure, and you can destroy a radiator quickly, especially if it is older/weak. You may want to consider at treatment of Dawn dishwashing soap 1st to insure the cooling system is clean of oil/grease. Typically happens from someone over greasing an original style water pump. Do this 1st especially if using rust911 or thermocure, these do not remove grease/oil. Then a treatment or 2 of Rust 911, or thermocure. These only go after rust/scale, and do not affect metal/rubber/plastic/etc. surfaces, so are very safe to use. Or you can use white vinegar. But if it develops a leak and gets on paint, can cause paint damage. If you do not have a leakless water pump, vinegar can flush out the grease in the water pump, and it leaks all over the engine compartment if you treat by running the motor. It alos may go out the hood louvers and get on the car exterior. With white vinegar you must do a final treatment of water/baking soda to neutralize the vinegar that has microscopically imbedded into the cooling system internal surfaces. -------------- You can treat the block and radiator separately, or together as a complete cooling system. If treated together, add the treatment, run the car on the road for up to a half hour or so for a couple of days, up to a couple of weeks. Drain, back flush through the lower radiator hose up through the radiator through the block and out the block coolant inlet. If using white vinegar do the water/Baking soda treatment. If doing separately you can block the block inlet and the radiator outlet and fill and let it sit. Or you can rig a circulating pump on a timer to circulate every so often for days. Again a treatment of water baking soda if using white vinegar. When completed, add a Gano upper coolant hose filter to keep future crud out of your radiator.