Radiator flushing question

There was a post a while back about people using detergent to flush a radiator , and a discontinued ingredient in a superb radiator flush. Anyone remember the ingredient or detergent used. Thanks.

Reply to
none2u
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Reply to
Frank S.

The old product was Dupont No 7 Radiator Flush, it was a two part product, the flushing agent was an acid, the second part was a nuetralizer. You flushed with water, added the first chemical, ran the engine for 15 minutes, flushed with water, added the second ran it for 15 minutes, flushed with water and then filled with coolant. Enviromental concerns and the move to aluminum in engines and cooling systems spelled its end. The detergent recomendation was to clean oil out a cooling system that had become contaminated because of a head gasket leak. Others have suggested something like lime away but that is not something I would try. Sodium carbonate, ie soda ash, or washing soda is an alkiline, a salt. As one poster here states it can be found in the laundry section , its also used in water softners. Its also used in traditional photography darkrooms to control the ph level in developers.

Whitelightning

Reply to
Whitelightning

Vinegar works well. Drain system and flush with clean water drain again and fill with straight vinegar and let it sit overnight. Flush again with plain water and fill with a baking soda solution and let sit for about 15 minutes to neutralize acid in vinegar.

Reply to
TheSnoMan

Reply to
Frank Thompson Jr

The acid was oxalic acid. It is still available as a wood bleach at some paint stores and on-line. It comes as a dry powder. It works very well on rust. The neutralizer was baking soda or sodium bicarbonate.

Randy

Reply to
Randal O'Brian

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