Reply To: Ethanol in Petrol, engine coolant and tyre pressures

[BernieParticipant]

Roger,

Coolant – In answer to your question of 19th June …. yes I was referring to Propylene Glycol pre-mixed coolant.

With respect to the “With 15 psi Cap” rider on the label, has the manufacturer offered you any explanation?

My thought is  ….. the greater the pressure of a liquid, the higher the boiling temperature so I think they are saying that the +132̊ is the boiling point at 15 p.s.i.  In a non-pressurised system I calculate the boiling point will drop to about 124̊  and the freezing point will change by about 4̊  (all at sea level of course) both of which will be OK unless you want to drive in Death Valley in the summer or Oymyakon in winter.

B…………………