98 blower motor switch only works on high

[98EB5.4]

New vehicle to me (few days..) & tried some searches. Haven't had a chance yet to get the FSM but on the agenda.

Usual suspects are the resistor & or relay(s)?

But dunno this tank yet.. & dunno where those guys might be?

Think it works on low for setting 1-2-3.

Maybe something else typically acts up? Switch itself? tia

EDIT - Found this thread..

Post #4 (but for a 97) sez

Same thing happened to my '97 F150. The blower resistor is probably rusted and the contacts have separated. You don't have to remove anything to get to it. It is behind the glove box. You have to get right up under the dash with your head against the floor and look up. It is held in with 2 screws. It's tricky because you can't see it while trying to unbolt it. You basically have to do it by feel.
I got a pic, but it's even hard to back enough to get it.

[BroncoJoe19]

You're right it could be the switch or the resistor. The switch is probably easier to get at and test.
If there is a relay, there is only one, not one for each speed.

[goon]

most likly the resistor, if high works. most of the time they are cheap and easy to replace.

[grump daddy]

I agree with above. I think you'll find the resitor bad as opposed to the switch. Come to think of it, I don't think that I've ever replaced a switch. It's always been the resitor.