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If a GM chassis and problem is dash air, remove the power wire from blower (under hood) & apply 12 volts directly in order to confirm blower even works. Next, pull blower relay harness & check for arcing/burnt wires & contacts (usually the culprit this year GM). If good, trace wire to relay and check for 12 volts at relay (be sure to use a test light) and do this across the ground and power wires to relay and, relay to blower. Bad grounds and burnt contacts on relays are more of a problem than fuses during these years.
Test the blower motor, turn on the switch and then with a test light conect it something that is grounded. Check for power at the harness, then connect the test light to the power side of the battery and test for grown at the harness if you have power and and ground replace the blower.
Go under the hood and test the positive wire that goes into the blower motor, it is a single wire with a sort of insuklated plug connector that locks onto a spade contact, check with a 12v test light if voltage replace the blower motor..very common, should be approx. 6 small 5/16 or 1/4 " bolts holding it in around its flange up against the fire wall on the passenger side top.
the resitor operates ground, if theres no power then its a bad fuse under the hood in the power fusebox, or #10 fuse inside the leftside of dash, power for the blower comes from the ignition switch,double check all fuses,if you had no ground to blower then i would say the resistor,make sure you have a good ground on the test light, then check for power with key on again, heres a wiring diagram to help you, good luck.
three things left to check, using test light see if you have power at motor with key and switch on,if you do replace motor,if not locate blower motor resistor it will be close to motor,check for power going in,last is the heater control assembly
check the resistors located under the hood, passenger side in the air box. two screws hold it in place as well as a wire harness to un-plug. common problem on gm and chrysler.
If thats not broke and rusted, then check the motor, fuse, and the relay.
You could contat any viking dealer and they would be able to help you, or you could go online to viking.com; finally you might find a replacement knob at a hardware store like a Valu where they usually have a large assortment to choose from.
boy, that sound like a major circuit to cause all that. either a main fuse under the hood or a main circuit wiring harness connector. there are no unfused circuits that could indicate a short unless there has been past fuse blowing problems