RichardsMG

According to Millersville University – a pdf, look for example 8 on automobile radiator, pp. 23-4 – coolant has an expansion coefficient of 4.0x10^-4 (C^o)^-1. They go on to calculate that in a coolant system of 15 quarts (14.2 l), when the coolant heats up from 6 to 92 degrees Celsius, the spill into the expansion tank will equal 0.46 quarts (0.44 l), which would be about a 3% expansion? But that obviously depends on the type of coolant used… On CarAraC it says some coolants may expand up to 8 to 12% at 100 C^o, about an average coffee cup?

Concerning the Skoda, if coolant expands and shrinks just like any other liquid, maybe the drop in level just made the sensor trip?

Richard