I have an Coleman DGAH Gas Furnace that I want to use the Blower Fan for cooling my home. Does anyone have a wiring diagram to bypass the heating control?

Are you adding A/C or just want the blower to blow?

There is a wiring diagram on the inside of the blower door or else where on the unit. Use the diagram to wire in a control to operate the blower. Since we are not there you will have to figure out what to do.

What type of control would you suggest?

I just want the blower to blow.

A simple switch should work.