I have a 97 Blazer LS 4x4 4 door. I replaced the broken blower fan switch, but found the plastic around the switch mounting area to be melted. This caused the switch to stick, so I Dremel'd off the melted stuff and the switch moves freely.

However, the blower still only works on the top two settings - let's say Hi and Medium-Hi. The lower two positions don't turn the fan on at all. I searched and found some info that points to the either the resistor or the relay. How can I test them to see which one is bad? Both are about the same price, but I'd rather not replace something that isn't bad. Thanks!

 

When the fan only works on the highest setting its the resistor that is bad.

 

Gonna try and replace that.


Thanks Large_Cat

 

No problem! There is a good article in the DIY section if you need a how to.