Defrost work windows fog

SOURCE: Heater works but defrost fills inside with fog.

your heater core has probably sprung a leak.does the fog smell kinda sweet?....check the floor in the front where the floor mats are for moisture or even puddles of antifreeze.(the replacement of a heater core can be very expensive as the entire dash usually needs to be removed to access the heater core)also look under the engine near the firewall for antifreeze drips.

SOURCE: antifreeze smell and smoke coming out of vents

You have a coolant leak most likely in the heater core. Try disconnecting your heater hoses and coupling them together, then running the engine to see if the leak goes away. If it does, I would have the heater core replaced.

SOURCE: fishy, steam odor coming from AC vents

Forget the radiator tank. Your AC 'Condensate drain' hose is plugged up. This is a common problem. If you know where the hose comes out under the car you can ( carefully ) push a wire up it. If you're lucky it's plugged near the end by a mud-dauber wasp. If not, take it to your dealer and see if you can persuade the write-up guy to show you where the drain outlet is as a gesture of good faith. If they insist on charging you money, consider that when you buy your next car...

SOURCE: coolant smell when defrost is engaged in hot setting

There is only one possible cause to this easily diagnosed symptom. Any mechanic will tell you: the heater core is leaking. This is why the steam is rising up to the windshield, and why you are smelling coolant. Your heater needs to be replaced. There is not quick fix, just replacement. Hope you can get this done soon. Heater cores are nice to have during winter weather. Steamy windows aren't easy to see through, and are hard to defrost! Thanks for the question. Good luck. TT

rtpflh

• 546 Answers
• Posted on Sep 29, 2009

SOURCE: 1999 Volvo S70 heater and defroster blowing "fog"

suspect leaking heater core.check coolant level.