windows fog up when heater is on

Asked by Jul 11, 2012 at 10:32 AM about the 1999 Ford Expedition

Question type: Maintenance & Repair

When I turn on the heater my windows fog up. And i can smell antifreese a little bit but nothing leaks.

2 Answers

1,000

If you smell antifreeze, you have a small leak. Heater core or the valve is leaking. The small amount will fall into the drip pan and if it is enough, it will exit on the ground like the condensation from air conditioner.

1 out of 1 people think this is helpful.
655

You almost certainly have a head gasket leak. Address this immediately or risk engine failure. The fact that you are getting a must of antifreeze on your windows indicates this.

1 out of 1 people think this is helpful.

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