Why do I have oily film on windows no leaks anywhere and when I turn on max ac it blows warm air. Do I have air pocket, bad thermostat,or is it heater core

Asked by Jan 13, 2015 at 07:12 AM about the 1997 Ford Expedition 4 Dr XLT 4WD SUV

Question type: Maintenance & Repair

2 Answers

10,930

Sounds like a Freon Leak (freon has compressor oil mixed with it) or a coolant lead in the heater core. If it's a freon leak than it won't be long before the compressor fails to come on due to the freon pressure switch sensing low freon

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255

Tom is right. Freon leaks come quick, and you would have likely seem the cloud. My bet....is a seep in the heater core, and as it warms and turns to steam it vaporizes on the windshield. Betting you soon find the right front carpet wet,,,or a drip behind the right front tire on the ground.

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