Types of cooling system
Discussion
On my celica, the cooling system has a spring type radiator cap located directly on the radiator which feeds excess coolant as the system reaches pressure into a separate unpressurised overflow tank, and sucks it back in when the system cools.
I recently worked on a mk6 Fiesta, which had a pressurised expansion tank onto which the pressure/fill cap was located.
I was wondering - why the two different systems? Is one more efficient than the other? It occured to me that the pressurisation of the Fiesta cooling system would be affected by the level in the expansion tank as it essentially acts as an accumulator for the system, whereas the (older) Toyota system contains no air in the pressurised circuit and is entirely dependent on the pressure cap to maintain system pressure.
I recently worked on a mk6 Fiesta, which had a pressurised expansion tank onto which the pressure/fill cap was located.
I was wondering - why the two different systems? Is one more efficient than the other? It occured to me that the pressurisation of the Fiesta cooling system would be affected by the level in the expansion tank as it essentially acts as an accumulator for the system, whereas the (older) Toyota system contains no air in the pressurised circuit and is entirely dependent on the pressure cap to maintain system pressure.
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