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My heating system currently has antifreeze in it. The system is completely isolated from the house water system. A small RV water pump is used to fill the system and pressurize properly. I do not know the type of antifreeze used in the system. With complete isolation, automotive should be acceptable. I am investigating RV antifreeze as well. Automotive antifreeze is toxic. There must be no connection between the heating system and the potable water systems. Isolation valves are not acceptable.The usual FHW heating in a home or other building is connected to the water (drinking water) supply with a pressure valve at the boiler.Automotive antifreeze is deadly and can cause blindness even in small amounts.There is a special antifreeze (non toxic) for use in heating systems where a backup/mix/crossover with the drinking water could occur.You could also burn out your circulation pump by using the wrong antifreeze, which is very expensive to replace.

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Q: How do I add antifreeze to hot water heat system?
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What is the procedure for refilling antifreeze after fixing a leak?

I assume you are referring to a fixed leak in the cooling system. In that case, add a solution of 50% antifreeze and 50% water to refill the system.


Why is antifreeze added to car radiators?

because liquid, especially water can dissipate heat. Water's actually the best at dissipating heat but since water boils/freezes(we don't want that especially in the winter, it'll just crack your rad due to expansion) they add antifreeze.


What type of water do you add to your antifreeze?

preferably distilled water


How do you check water in radiator how much do you put in?

The cooling system in most vehicles has a reservoir and the reservoir is marked full and add. Open the cap when vehicle is totally cooled down and add a mixture of 50% water and 50% antifreeze and be sure to add the correct antifreeze for your vehicle. Never add just plain water unless it is an emergency to get you to a garage.


Can you put straight water into cooling system next to radiator?

In an emergency you can but you really should add a mix of 50% clean water and 50% antifreeze.


What is the best reason to use water as a coolant?

The best reason to use water as a coolant is because is because it has a high specific heat capacity. However, you can add a mix of antifreeze with your water.


When adding Prestone antifreeze to a Chevy Cavalier 1999 do you need to add water also?

Yes. Never add pure antifreeze. Pure antifreeze will actually freeze before a 50/50 mix. Add coolant that is a 50/50 mix of antifreeze and distilled water. You can buy it already pre-mixed.


When i add antifreeze to my carr it just leaks all out by the motor the the car starts to over heat what could be the problem?

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Never add water, add coolant, which is a 50/50 mix of antifreeze and distilled water. Add it to the overflow or recovery reservoir.


How much antifreeze should you put in a 1997 Ford Crown Victoria?

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How do i add water to the radiator in a 2005 Malibu?

It is no longer necessary to add just water to a radiator in newer cars like the 2005 Malibu. An antifreeze that is half water and half antifreeze is usually best. Add the 50/50 antifreeze to the radiator overflow tank. It should be a plastic, see through tank hooked to the radiator.