My AC only blows on high and I found out it could be the blower motor reesistor. I ordered the resistor and have it here. However, I cannot locate where the resistor is on my 1999 F250 4X4 truck. Has anyone replaced it and knows where it is located? Thank you.

 

Welcome to the site..

It's located on the evaporator core housing in the engine compartment, right/passenger side up close to the firewall..