USED TO PROTECT AGAINST FREEZING & OVERHEATING
SABS 1251 formula has a maximum of 5% water and is ready to use, which means that it should not be diluted further i.e. only 6(depends on radiator capacity) x 1lt antifreeze should be added to the radiator, no additional water.This would give you a 95% MEG : 5% water dilution rate.
SABS 1839 formula has a maximum of 40% MEG and is ready to use. Which means that it should not be diluted further i.e. (depends on radiator capacity) 6 x 1lt antifreeze should be added to the radiator, no additional water.
This would give you a 40% MEG : 60% water dilution, which gives a protection rate of up to –24C.
The Holts formula is 40% MEG and 60% water with a dilution rate of 50% antifreeze to 50% water. On a 6lt radiator, this means that 3 x 1lt antifreeze should be added to the system and 3lt of water. This will effectively only give you 20% MEG in the cooling system with a protection rate of up to –12C.
To ensure that 40% MEG is in the system, the Holts product should be used as is i.e. 6 x 1lt antifreeze with no additional water being added. This will give protection up to –24C
PASSENGER VEHICLE RADIATOR CAPACITY IS NORMALLY BETWEEN 6 – 7 LITRES
The only antifreeze formula that is safe to be used on aluminium heads and is guaranteed not to cause any pitting of the aluminium is:
ORGANIC ACID TECHNOLOGY (Silicate & Borax free)
Only the Caltex Extended Life and Castrol SF products are made accordingly. These products do not contain any Silicate or Borax, but has some other replacement chemicals added.
The Caterpillar and Delta/Isuzu antifreeze formula also contains no Silicate or Borax.
Various motor manufacturers insist on their own branded antifreeze.
- Toyota, Ford and Honda formulas are similar, colouring differs
- Merc, BMW and Delta are similar, colouring differs
If the antifreeze to water ratio is too weak, then various problems will occur over an extended period of time i.e.
- pitting of aluminium
- general deterioration of parts in the cooling system
ANTIFREEZE / SUMMER COOLANT
USED TO PROTECT AGAINST OVER HEATING
Adding Antifreeze/Summer Coolant to the cooling system will only assist with protection against over heating. A cooling system filled with 100% MEG will start boiling at 140 degrees. A number of other factors play a more important part in preventing over heating.
The radiator cap, and the proper functioning of it, is all important as it would increase the boiling point of the water in the radiator without the addition of MEG. For every pound pressure of the cap, the boiling point of pure water is raised by between 2 to 3 degrees centigrade. The radiator caps are in general 13 pounds per square inch (PSI), and this will give you a boiling point of at least 126 degrees centigrade.
The radiator cap will start releasing pressure (when the vehicle is stationary) at approximately 105 to 107 degrees. In general, the water that enters the water pump should not be hotter than 100 degrees.
In extreme cases, over heating can lead to a number of problems including the cracking of the block. The cracking of the block can also be due to other factors i.e.
- Cold water being added to the system once water reached boiling point
- Overheating can also be due to:
: Insufficient water in the cooling system
: Radiator core corroded
: Radiator caps not functioning properly
: Top gasket leaking
: Insufficient lubrication/oil
: Hard driving
Antifreeze/Summer Coolant in the cooling system plays a very small part in the prevention of overheating. The conditioners, anti foaming agents and rust inhibitors, together with the anti freezing properties in the product, is the main reason that anti freeze should be added to the cooling system.
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