Recently I have been experience "foggy" windows when I turn the heat on. I've tried adjusting the heat, fan speed and outlet setting. It seems like a moist air is coming from the vents and fogging the windows. Rad doesn't show any liquid loss, nor the overflow. Suggestions ?????

 

turning the heat on? what if you turn the defroster on ?

You probably have a leak in the heater core.
To check
1. Is there an odor of coolant from the vent.
2. There may be coolant leaking on either the floor mats, or there may be a drain on the engine side of the firewall.
3. A rad shop has equipment to pressurize your coolant system. If there is a leak anywhere this will find it

 

Thanx. Couldn't find any dampness inside or under hood. Tried rad leak liquid and it seems to work better. Trying to find how to change core and shop rate/hours required.