What causes a film on the windshield, also a smell when heater is on? on 1997 Mercury Cougar

It casues my eyes to burn and my heart to race.

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1 answer
our heater core is leaking antifreeze into the heater air box and the film on the windshield is engine coolant if the film is easly streaked as u wipe it then deffenently that will cause your problem