I have a Coleman Evcon Presidential furnace Serial #72154 #360169. 47995-B56 it is a 72MBTU model circa 1989. The problem is the central air keeps blowing and won't shut off, even at the desired temperature. The only way to turn off the air conditioning is to manually shut off power to the furnace itself. My new thermostat is a Honeywell digital. I currently only have a red and white wire going to the thermostat. Which wires do I need to run from my furnace (and where are they located) to the thermostat? Thank you, Chris.

If you have a rocker switch on the furnace that changes it over from heat to A/C you have the wrong thermostat.