2003 Mercury Marquis Radiator Hoses

[quote:a7b8a3c6ae="xpmtterrx"]Other Category problem
2003 Mercury Marquis V8 Two Wheel Drive Automatic 40000 miles
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How do I determine which radiator hose carries the coolant into the heater core? I'm going to flush the system.[/quote:a7b8a3c6ae]
do it the opposite way
follow it from the firewall back to the engine
you may have a bypass hose in between
that need to be pinched and plugged before doing the flush

you can pinch off both hoses, and whatever hose is hot before the heater core is the in line. It doesnt really matter whats in and whats out.