Molten Plastic smell

[MSR7878]

Recently I have notice a melting plastic/rubber smell when my heater is on, but only when the car is sitting still, or going very slowly (<20mph). I looked under the hood and all around in the car and all I found was leaves on the inlet for the ventilation, removed them but the smell is still there sometimes. Any Ideas?

[Smokie]

I don't know if the problem exist today, but all of my previous Ford's had problems with a/c power harness connectors (under dash), bad connections=heat and melted insulation, of course it took about 15 years before the problem developed.

[Bradley G]

Did any of the debris make it past the screen into fan blower housing?This happened to me on a ford f-250 the ceramic resistor caught leaves on fire inside blower housing.Thick smoke came blasting out of vents and defroster outlet on dash.It was easy to remedy,just a little messy.

Bradley G