My blower blows to long until it blows cold I drop two degrees per cycle while blowing cold.I have a adjustment for the f/s what do I do

I have a Coleman Presidential 3 7900 series Gas Furnace that has 3 openings on the front panels for return air. However, when I bought this mobile home, there were no filters on any of the 3 return air vents on the front panels. My question is: Do I need 3 filters for this unit, and if so...

Hi I'm trying to help my uncle get his coleman presidential 3 7900 series standing pilot furnace working.. he told me that about 2 years ago they had a power serge and it hasn't worked sense then. What could be the problem?

Hi I'm trying to help my uncle get his coleman 7900 series furnace working.. he told me that about 2 years ago they had a power serge and it hasn't worked sense then. What could be the problem? :confused:

During the winter our heating unit pilot light would seem to go out all the time. Now it's summer and you can hear the motor trying to run but the squirel cage won't spin. Also it looks like a pipe at the bottom looks frosty. I've a Presidential III Coleman 7900 Series unit