Datsun Roadster Forum-311s.org

I took my radiator out of a running car to my local radiator repair shop. It did not have any leaks but they said it was 40% clogged! I had noticed the car was running hot and wondered why. I asked if it was from sitting for long periods of time but they said no, it was from the antifreeze! They said as the fluid gets older it breaks down to the inert additives which build up deposits on the tubes which they can't remove. They showed me examples of some other radiators that had the same problem, nasty-looking buildups of calcified-like gunk. They said that even if the top of the tubes look ok the center or bottoms can be clogged. His recommendation was to change the fluid regularly and try what they use- Global brand. Definitely an eye-opener for me.

Manufacturers have recommended distilled water for years as the dilution fluid. This is in part why.

Did they suggest they could rod it out ?
I don't get what distilled h02 is a benefit
Yeah I suppose if it went thru calciumed up pipes
Premixed to make more $
Green AF is basically the same
Toyotas red AF from 86 the main diff

Antifreeze technology has come a long way since our cars were built... distilled water as an additive because it has a much lower potential for minerals precipitating out as it is heated. Many of the modern antifreezes come premixed - to an appropriate freezing point.

And we know antifreeze in Alberta. A month ago it was -35celcius. Brrrrrrrrrrrrr

Datsun.David wrote: Thu Feb 10, 2022 11:31 pm Antifreeze technology has come a long way since our cars were built... distilled water as an additive because it has a much lower potential for minerals precipitating out as it is heated. Many of the modern antifreezes come premixed - to an appropriate freezing point.

Just as many are still sold as concentrates that need to be diluted with distilled water.