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Are you sure that you need a blower switch? There are other items that are prone to going out before the switch like the resistor or the motor, but if it is the switch you first remove the large piece of trim that surrounds the radio, heater controls, and instrument cluster. This will reveal the screws that hold the heater control head into the dash.
4.3l v6 firing order is 1-6-5-4-3-2 number 1 is on the drivers side front. They are numbered from front to back as follows..drivers side 1-3-5 passenger side 2-4-6. Older model engines with distributor caps have number 1 on the center front post and the rotation is clockwise.
probly the switch is burnt-it happens when the blower motor gits old and draws too many amps---so replace blower at same time or else same issue again--and while u gut dashboard all apart inspect ac evaporator and heater core-theyr aging too
first make sure you have anti-freeze in it and there is no air bubbles in the system and if you are talking about the blower motor make sure all of wires are good and the temp limited switch next to the blower motor is good give these websites a try www.alldatadiy.com and www.autozone.com if all fails stop by your local library and get your hands on a Haynes auto repair manual for your truck wish you the best of luck Michigan Man.
Get a female garden hose adapter from the local hardware store. Disconnect the heater hose from behind the fan pulley and attach the hose connection. Disconnect the other heater hose behind the alternator, aim it towards the ground and flush water through the heater core. This worked on my truck.