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8EL · 09-16-2023, 08:10 AM

Climbing a hill is requiring more work to be done by the engine, which causes more fuel to be consumed, therefore more heat being generated. This points at the heat ex changer's (radiator) inability to reject this additional heat being generated. The cause for this is usually rust and scale accumulation that reduce flow and the reduced flow that is present and the heat being carried by it is being insulated from the tubes which exchange this heat to the air flowing through them. Double negative, vicious circle....

If this is the case then this same scale has collected in the block causing the same issues. Pull the radiator have it back flushed or do it yourself, and back flush the block with a garden hose. A short piece of radiator hose and a couple of fittings (nipples/house adapters) can easily be fashioned to fit the outlet (you are back flushing, introducing flow in the opposite direction of normal flow to aid in dislodging the scale) to your garden hose. Do not do this if the block is hot, as the cold well water could thermal shock the block resulting in serious issues, possibly warping the cylinder head casting. No risk of this would be incurred at ambient or slightly above ambient temperature.

Does it also overheat if running at high speed for prolonged periods?

09-16-2023, 08:10 AM	#8
8EL Senior Member Join Date: Jul 2023 Posts: 235	Re: Radiator boiling over Climbing a hill is requiring more work to be done by the engine, which causes more fuel to be consumed, therefore more heat being generated. This points at the heat ex changer's (radiator) inability to reject this additional heat being generated. The cause for this is usually rust and scale accumulation that reduce flow and the reduced flow that is present and the heat being carried by it is being insulated from the tubes which exchange this heat to the air flowing through them. Double negative, vicious circle.... If this is the case then this same scale has collected in the block causing the same issues. Pull the radiator have it back flushed or do it yourself, and back flush the block with a garden hose. A short piece of radiator hose and a couple of fittings (nipples/house adapters) can easily be fashioned to fit the outlet (you are back flushing, introducing flow in the opposite direction of normal flow to aid in dislodging the scale) to your garden hose. Do not do this if the block is hot, as the cold well water could thermal shock the block resulting in serious issues, possibly warping the cylinder head casting. No risk of this would be incurred at ambient or slightly above ambient temperature. Does it also overheat if running at high speed for prolonged periods?