HVAC (heat and air conditioning) will only work on highest speed.
Possible damage to connector or fire.
Look at the link I posted, that should help you. (:
Remove the HVAC rear module auxiliary assembly.Disconnect the electrical connectors from the rear blower resister auxiliary.Remove the air outlet duct from the rear blower motor controller auxiliary.Remove the screws from the blower motor rear resister auxiliary.Remove the rear blower motor resister auxiliary.Replace the resister and install new thermal gasket.................
if you lost one or two fan speeds you need to change the blower motor resister. it sells for around $60.00 at a dealer only.
chevy trucks have the blower resistor pack in the bottom of the airbox on the passenger side under the dash. i would assume the suv's would be the same.
There could be two separate problems. Check the blower motor resister, and the ABS sensors for problems that could cause this.
AutoZone.com will show you a pic.............
usually mounted on or next to blower motor
Replace the blower motor speed resister.
Under the hood, passenger side firewall, close to the heater blower motor.
Probably your blower motor speed resister is burned out.
Blower motor NG. Blower motor resister NG. Blower motor fuse NG. Blower motor switch NG.
1999 S10, it should be under the hood, on the firewall, on the passengers side, close to the blower motor.