Dash Blower only works on high

[tmustard]

I've had the rotary switch in the dash replaced twice but after a week the blower will only work on the high setting. I need ideas please.

[HarveyP]

Hi, you need to find the resistor pack. It is usually on the outside of the blower housing, right behind the fan location. It will have a connector with 4 or 5 wires running into it. Usually 2 screws holding it in place. If you can remove it and take to an auto parts place, they can match it up for a replacement. I just replaced the thermal fuse, which looks like a tiny silver can. Use a magnifying glass to read the fine print, and it will tell you the temperature rating. I bought the replacement at a Radio Shack and just crimped it in place. Write back if you need more direction. HarveyP

[Tincup]

I had the same problem on my Chevy Colorado pick up. It was the resistor but it wasn't defective. The resistor is a large, maybe 2"x3" power resistor with 4 or 5 pins that slide into a receptacle. One of the pins wasn't making good contact, I jury rigged a fix and problem solved. So the moral is you may not have to replace the resistor, first check to see if it's making good contact with the receptacle.

[tmustard]

Thanks both of you for your suggestions. I'll get to work on it tomorrow. makes great sense what both of you said. It helps a lot.

[HarveyP]

If you have continuity through all terminals, the thermal fuse is okay. If only through two, it is likely the fuse.The thermal fuse I bought was about $4 dollars. HarveyP