I have a 99 k1500 suburban and the fan for the heater is not working. Here is what was happening when it finally did die. It would not come on for a few hours then when it did come on with the switch on high it blow at high speed, but when I would go to change to a lower speed it would not work at all again. Then some times I could turn the truck off and on and get it to work. Now it doesn't come on at all. I checked the connectors and they all seem to be tight. The back heater fan controls work fine its just the front that doesn't work any more. Does this sound like it's the switch? Is there any way to test the switch to see if it bad.
I was going to go ahead and buy another switch but at $175 bucks I figure I might need to find out for sure before I start just replacing things.
Thanks for any advice