4 or 6

[alexiskai]

Originally Posted by BRENT in 10-uh-C

I wish someone would Google 'Does Antifreeze need to be under pressure to work' and report back what the manufacturers say. Then, let's start a poll on how many have pressurized cooling systems in their Model-A.

If you do Google this you will get a misleading answer because in colloquial speech the word antifreeze is used interchangeably with the word coolant. What you’ll get is people talking about whether your car’s coolant system needs to be pressurized to work, and of course in modern cars the answer is yes. If you are talking about literal antifreeze, ethylene glycol, then no, it does not need to be pressurized to work, and the proof of this is that there is documentation of Ford dealers putting ethylene glycol antifreeze in Model As in 1929 and reporting that it worked great.