Need to find a system that sounds great, and has serious bass, for a 84 maxima station wagon.

Do you know what a wiring diagram is ? A wiring diagram for your vehicles windshield wipers electrical circuit would show all components involved . You would need a wiring diagram for testing ,so you know which wires too test . It would show the fuse location - amperage etc.... Which of these is your vehicle - Notchback or hatchback or station wagon .

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Service Information
2008 Holden Viva ' Optra, Viva (VIN J) Service Manual ' Body Systems ' Wipers and Washers ' Schematic and Routing Diagrams ' Document ID: 1964803
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Wiper/Washer Schematics
Figure 1: Wiper System - Notchback
Figure 2: Wiper System hatchback and Station Wagon
Figure 3: Wiper System Hatchback and Station Wagon w/Intermittent
Figure 4: Wiper System Notchback w/Rain Sensor
Figure 5: Wiper System Hatchback and Station Wagon w/Rain Sensor
Figure 6: Wiper System Hatchback and Station Wagon w/Intermittent and Rain Sensor
© 2019 General Motors Corporation. All rights reserved.

The fuse would be marked WPR fuse # 9 25 amp. located in the IP fuse panel . IP - instrument panel fuse box . It's location is
Fuse Block - I/P
Behind the left side of the I/P access panel
Windshield Wiper System
The windshield wiper system consists of a wiper motor, a linkage, a wiper arm and a blade, and a wiper/washer switch. The windshield wiper circuit incorporates a self parking device which consists of a worm gear and a cam plate in order to keep the circuit engaged temporarily when the switch is turned off. The wiper system is driven by a permanent magnet-type motor. The windshield wiper motor is mounted on the dash panel and is directly connected to the windshield wiper linkage.
The windshield wiper motor has 2 speeds, LO and HI, and also has intermittent wiper capability. The wiper switch is an integral part of the wiper/washer switch. Windshield wiper operation is actuated through the lever on the right side of the steering column.

https://www.youtube.com/watch?v=MvXX3Xg3siM

Yes thermostat stuck closed or clogged radiator.

Could be a bad accelerator pump in the carburetor. But also check the timing and dwell adjustments.

there is no such thing as a caprice estate wagon,the caprice estate IS THE STATION WAGON,the caprice brougham is the caprice 4 door. Caprice estate wagon emblems Bing images

i think your problem is the heater motor ,its worn out and need replacing as the bearings are dry or its come loose and its hitting the casing with the fan

The float may be sticking in the carb not letting it take fuel.

No, the transmission can be removed without doing that. You will need to support the engine.

There shouldn't be any welding involved. The 4.0 is a detuned 4.2 due to fuel injection.

sounds like the timing is out, the battery is low and the fuel filter may need to be changed. cheers !

alpine, under dash, or under seat. same model. loads of bass and quality sound. the best and very cheap n versatile. trust me! enjoy!