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Under the dash there is a 10mm hex head bolt on the very right side. Under the hood there are 3 or 4 11mm hex head nuts on studs. Remove the heater hoses carefully from the heater core stems. carefully because they are going to adhere themselves to the heater core connections and you must gentle...

Ok. I see one of these capacitors over on the heater end on the firewall. I don't know that there are capacitors on the heater side. Maybe 1 on the blower motor wire. This piece is attached to the black tin cover under the hood on the heater box cover. Flat ribbon of brightly colored wires blue...

Next step is to strip the cab dash area down this far and start spraying water. That will tell you where it is coming in. I recommend having the windshield installed. Good Luck.

No this is screwed to the outside of the heater box behind the battery. It has 2 small 7mm hex head screws holding it in place. And I think those 3 round things on the wiper motor are capacitors. They are to reduce noise and avoid interference with radio equipment. Police cares have or had...

The resistor is under the hood behind the rear battery.

The blower motor and resister are going bad. They are also know for having a loose connection at the switch for the blower and melting the switch and pigtail. But the sequel is the blower motor bearing going out. Could have a rats nest in the heater box.