If, when you turn on the defroster, the problem quickly gets worse, it’s the heater core leaking or the air conditioner drain is plugged up, allowing water to collect in the heater box… This saturated air then condenses on the windshield…
If, when you turn on the defroster, the problem quickly gets worse, it’s the heater core leaking or the air conditioner drain is plugged up, allowing water to collect in the heater box… This saturated air then condenses on the windshield…