I would first check for a vacuum leak, going to or after vacuum selector valve. Check all the vacuum lines to make sure there aren't any holes. They are small hard plastic lines wich tend to dryrot and crack easy, so be carfull not to break them when looking. Replace anything that is damaged or looks to soon be a problem. You also need to check the vacuum at the diaphragms to make sure they hold a vacuum. All of this should be located under the dash, mainly on the passengers side. You may have to check the main vacuum line coming in to the system, located under the hood next to intake. Hope this helps out.
the heater blower fan is in the heater housing assembly on the passenger side. You need to take out the whole housing assembly in order to access the blower.
the heater blower is located under the dash on the passenger side. easy to change ,4 skrews.
They generally locate the heater motor speed resistor nearby the blower motor because the resistor depends on the blower to keep it cooled.
There has to be a Blower RELAY at fault, the problem is I don't know where it's located, YET!! If you have a repair manual and can locate the Relay please post info...
Find the blower and locate the electrical connector on it. Using a common volt meter, check the wires for voltage and play with the switches inside the vehicle.....Good voltage usually means a bad blower. No voltage means you need to find another problem. You did check the fuzes first, didn't you? :)
Many of these controls are Vacuum operated. You may have a problem where the "Main" Vacuum line has broken. See if you can locate this line by using your manual and make sure that it is intact. TommyTrouble
There's a big, black plastic cover over the blower motor under the hood under the firewall. It's just behind the alternator.
locate blower motor under pass side dash ther are 3 bolts and conn. to remove
On the passenger side up under the dash locate the blower and unplug the wires remove three screws (8 mm ) and drop the motor down and replace
You will need to locate a few wires that are located on a small plate between the heater and air system of a 2002 Kia Sportage. The resister pack rests there and can be removed and replaced to fix the blower.
Your wiring is probably messed up, happened to me. Locate the wires from the blower to the controls check them and replace as needed. Assuming no wiring problem check and replace the blower motor resistor.
where to locate heater fuses for a 2001 grand prix gt