My a/c only works on speed 4 of 4, changed speed switch still same what else. on 2003 Ford Explorer Sport Trac

Changed speed switch what else is relevant to blower speed.

Asked by for the 2003 Ford Explorer Sport Trac
Your problem is the blower motor resistor. That is what needs replaced.
Thank you, problem fixed.
2 more answers , 2 more comments
Don't know your skill level but here goes, these are the parts you need (NAPA numbers) ECH-BR285 and EC1285 this is for the blower resistor and the connector. Located behind glove box, left of the blower motor!! Save yourself some trouble, if the connector is burnt at all replace it also!!!
Thank you, problem fixed.
blower motor resistor is bad. under dash pass side
Thank you, problem fixed.