Cab Heater motor 1 speed

[Woodyt]

2002 Georgetown ac/heater motor only blows on high. F53 chassis, does this have an inline relay or resistor I should look for?

[bubbles]

If you are talking about the coach furnace the fan speed is not controllable. The A/C fan speed should be controllable. Don't know what thermostat your 2002 GT has so don't know what fan speed selections are available. If you are talking about the engine driven front end heater/A/C that's a whole other issue.

[Woodyt]

The coach system is fine, the driver's control is the problem

[bubbles]

If it is the resistor array I'm not sure of where it is installed (inside or outside) if your coach has one. Here is a simplified schematic if yours does. Second schematic.

[Woodyt]

Thanks, will look into it tomorrow..

[bubbles]

In my 2012 F53 chassis the resistor array is located inside on the copilot side mounted to the bottom of the blower (fan) air distribution manifold via 2 screws.

[TitanMike]

Definitely the speed control resistor and as said, is mounted in blower housing discharge. Three Fords owned, three resistors replaced. Usually not a big job. A couple screws and a plug.

Giveaway is that it only works on High. This is because HIGH is direct from the control without passing through the resistor which gives the different speeds.