1998 K1500 fan stuck on high

[Cbruce]

I have seached this forum and havn't found another post with exactly my problem. So forgive me if this has been addressed previously. My fan speed selector switch will not change the speed of the fan. It runs continously on high. I've seen posts that refer to the resistors that feed power to the fan. However, I think my problem may be the switch. If I thump around on the switch or turn the switch hard to the left sometimes it will slow the fan but it will never go completely off. So, whaddya think? Switch or resistors?

TIA

CB

[777stickman]

With the fan switch in "high" the resistor pack is bypassed. Most likley the switch module.

[Cbruce]

Thanks for the reply. I also suspected the switch and picked one up at the dealership today for about $22. I'll let you know how it goes. Thanks again.

CB

[Blue Bowtie]

Just a W.A.G., but the high speed relay contacts may also be welded.

[Cbruce]

Well, got the switch put in and all fan speeds work fine. FWIW, upon inspecting the old switch I could see that two of the seven pins are bridged and around the bridge that connects the pins the plastic had melted. The parts guy at the dealership said they had had problems with the switch melting and sure enough...... Thanks again for all input.

CB

[777stickman]

CB: Good job and thanks for posting back............Steve