My question is, in a modern vehicle, (Big 3 Pickup Truck, or full size Van)...
A.
Are the cooling systems designed so if PLAIN WATER was used, under moderate to heavy load, the system could handle the load, and not overheat, or discharge liquid?
Or
B.
The systems are designed so coolant/antifreeze is required to raise the boiling point and prevent overheating and discharge of liquid from the pressure cap?
In other words, does the stock system have enough cooling capacity
to work with plain water and not boil the water and lift the pressure cap?
I appreciate any comments, speculation, or guesses.
But I would really like to hear from someone directly involved in
power train engineering that is truly in the know, and can comment
without any doubt or speculation.
Thanks in advance!
K