I have a 2000 Durango with a leaking heater core. I bypassed it because 1. It leaks coolant into the inside of the passenger compartment and fogs the heck out of the windows! And 2. You have to remove the entire dash to replace it. The core is only about $55, but the labor is a couple of days for a "good" DIY Mechanic. It's about $1,200 in labor to have a shop do it.
I'm in So. Cal. So it doesn't hurt too bad to be chilly in the morning.
Good luck!
Whenever you find that a heater core has been bypassed, you can bet it leaks. Being bypassed will not hurt the engine but definitely very uncomfortable in winter.
It was bypassed because the previous owner didn't want to change the leaking heater core, it is a big job.
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