Strange smell and steam coming out of vents

[Petem]

After driving home from Florida this weekend to Pa my windows started to fog up. There was also an unusual smell (like a wet wool blanket). The defrost was set on high heat but was barely luke warm. The defrost was adding humidity to the windshield. It was so wet in fact it seemed like it was sprayed with a misting water bottle. When I shut the defrost off and put the heater on there was actually steam (or some kind of vapor coming through the vents. I'm stumped any suggestions would be grealy appreciated.

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[fordtec2001]

possible heate core leaking and theres is a tsb out for a moldy smell thur vents i think it had to do with the a/c if i remeber right

[Tye]

Yeah, sounds like a leaky heater core. Have that checked out. The smell and moisture is coolant.

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1991 F250 R/C L/B 4X2
300 I6 5 speed

[Petem]

<font face="Verdana, Arial" size="2">Originally posted by Tye:
Yeah, sounds like a leaky heater core. Have that checked out. The smell and moisture is coolant.

</font>

Is the heater core something I can (or want) to check out myself???