2018 Pacifica L
 

My issue is on a 2018 L model. purchased new with 18 miles on it. after about 3500 miles notices a film on inside windshield and coolant smell in cabin. checked coolant level and area for sign of loss or leak nothing found. coolant smell lingered. after vehicle hit 5000 miles i was checking fluid levels when i noticed coolant reservoir was below minimum line on reservoir engine off and cold. started monitoring coolant at this point. over the next 2 years coolant smell, loss and three different dealer service trips and 20,000 mile and 1.5 gallons of coolant, die add to system and finding reservoir almost empty at 17,000 issue continues. system has been pressure tested three time no pressure loss.
Coolant smell/ reservoir slowly empties (1/4 inch of tank every 4-6000 miles) having worked in airspace I have knowledge of fine and gross leaks I think vehicle has a fine leak. could that be? anyone heard or experienced this issue where is the coolant going. remember vehicle is under warranty so i have done nothing to it after warranty expiries march of this year i am going to pull plugs, any thought on that?
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"film on inside windshield and coolant smell in cabin."
Heater core leaking

Dealer's and Chrysler would not consider the repair. no evidence of a leak

film on inside windshield and coolant smell in cabin that's all the evidence I would need for the repair. no other entry point for coolant to make a smell inside and also the film on the window water does not make that.