1997 Mercury Mountaineer No Cold air or Heat

Hello -

Let's check one at a time.........

For the heat... How is the coolant level.......

Is the engine overheating at all..... Or is it running really cold even after driving for awhile

Have you ever changed the thermostat

With the vehicle at operating temperature, please turn the heater on high and feel the heater hoses going into the firewall... Is one hot and the other cool or not nearly as hot as the other?

Have you put AC gauges on the AC system to see if it is properly charged