Reply to "Fogged Gauges"

Condensation occurs when moist air contacts a cold surface where the temp of the surface is lower than the dew point of the air. Like the mirror in your bathroom. A warm shower increases the moisture content of the air, which raises the dew point temp to a point where the temp of the glass (and walls, etc) is lower than the dew point of the moist air.

The question to ask is, where is the moisture coming from. It could be a leak in a heater tube. Or the foam material the console is made of absorbs moisture & then releases it when it gets warm. Those are my 2 best guesses, I emphasize they are just guesses. The second scenario would explain Mark's observation.

My gages don't fog in So Cal, but they do when I visit other moist climates, especially when I have to park the car outdoors overnight. Driving with the lights on, the faces of the gages get very warm and the condensation disappears. I also run the a/c when the air is very moist (rain, fog, driving near the ocean) to keep the air inside the passenger cabin dry which prevents the windows from fogging up.

Your friend on the DTIC