Kia Troubleshooting Questions? Ask a Mechanic
to get a coolant leak from the rear of the engine then its likely to be one of the small link hoses that runs through into the passenger compartment and into the heater mattrix
I'd say it should be a reasonable thing to fix, parts cost for hoses is pretty low usually less than $100 , depending on whats broken often less than this and then 1 -2 hours labour to replace the parts
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