I am dong this job today...and its looks like the alternator will need to be removed since it doesn't have a range of positioning; its stationary. unlike most vehicles the tensioner is separate so yes the alternator will need to come off.
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In 1980 the blower motor is changed from the engine compartment. It is located on the passenger side of the firewall, sitting low behind the inner fender. It will have a single wire plugged in to it and is attached with 4 small bolts. Simply unplug the wire and undo the bolts, 5/16 I think, and the motor pulls out. A whole lot easier than newer cars. Hope this helps.
Remove lower kick panel passenger side, blower motor in inside heater case, very close to the passenger door, behind glove box. From under the glove box look up to find a circular bulge with 5 (7mm) bolts around it, remove the 2 wire connector (black and purple). Remove the five bolts, drop down the blower motor, transfe over cage if new one doesn't come with one, reverse to reassemble.
The Blower Resistor is tucked behind the Firewall. That is the part the connector attaches to. The opposite end of the connector harness runs from the Blower motor to the Blower Resistor.
There should be 2 screws holding this part into the Firewall. The rear Heater hose may be in the way when you go to remove the Resistor so I would wait until the engine is cold, undo the attaching bolts and connector and then finally switch the part. You will lose only a minimum amount of Antifreeze by doing the job on a cold engine.
You can verify the old Resistor is bad by using your replacement Resistor and connecting it to the plug before you remove the old part. When you turn the Ignition Key to Run or ACC. the Blower should run and adjust speeds like new. Then switch out your parts.
HVAC blower motor and fan axcess is under the hood in the center of the firewall. Its easy to remove start by using a large screwdriver to slightly bend foward the engine removal lift eyelet right in front of the fan motor for clearance to remove blower. Unplug the 1 power wire going to the blower, Then remove the 5 or 6 ,7mm bolts retaining the assy to the firewall the pull it out.. while its out clean out any debris in the blower case (leafs ect ) Hope this helps Good luck
For 4.0L, inside the engine compartment, on the passenger side firewall, remove the coolant overflow bottle retaining strap remove the coolant overflow bottle and bracket. Unplug the blower motor. Remove the 3 blower motor bolts.Remove the blower motor.Remove the blower motor fan from the motor shaft for access to the motor attaching nuts. For the V-8, you just need to unbolt the blower motor to remove.
inside engine compartment on passanger side on firewall. If I recall correctly, you have to remove cooling resivor, and computer. You don't have to unplug the computer you might have to pinch off the hose on the resivor. Once those two are removed, you unplug blower motor and undo I think 5 or 6 small bolts and do the reverse for installiton.