Quote:
Originally Posted by steve25
So someone explain to me why a heater core is any less sturdy then a radiator when it comes to holding up to 16 psi?
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Hydraulics. It's not the overall pressure of the system as measured at the radiator cap but the "push" of the coolant through the engine and subsequent passage through the restriction of the heater core. By the time the coolant reaches the radiator the flow has stabilized. Heater core can be seen as the nozzle at the end of a hose. Good to move that "nozzle" before the heater core in the form of a 1/4" restriction and let it take the abuse.