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Stock JK TechBulletin board forum regarding issues with OE (original equipment) components of the Jeep JK Wrangler (Rubicon, Sahara, Unlimited and X) such as factory suspension parts, engine, transmission, body parts, interior fixtures and the on-board computer.
Only thing dealing with coolant inside is heater core.
Sent from my iPhone using JK-Forum
Yep. Bad heater core. Easy fix, but can be messy. Drain the coolant first, have old rags ready, disconnect, remove, reconnect, refill coolant and presto!