Just need the replacement cover for the electronics system on RT firewall

Most likely not a fuse. The instrument cluster is controlled by the body control module as well as the temp control system. Possible communication issue that needs to be reset or repaired. I agree with Johnny.... have the dealer take a look

for passenger side:
1. unclip screw cover 'center flap' of inside door opener plastic cover, flap is 3/8"x 3/8" (center of plastic cover)
2. remove phillips screw now showing
3. push fabric panel (edge of door opener plastic cover-at hinged end of chrome handle) to allow uncliping of edge of plastic cover (top rt & lwr rt (for passenger side) of plastic cover)
4. open chrome inside door handle to allow plastic cover to be removed-slide plastic cover toward rear, free end of door to remove cover
5. remove switch panel-gently pry with wide non maring pry bar (cover wide blade screwdriver using cloth) do rear of sw panel 1st (don't pry front edge)
6. slide switch panel toward rear to allow removal
7. remove large phillips screw under sw panel
8. remove the 2 plastic covers near top, hinge edge -use plastic spoon handles to encourage caps to pop off. May also require small screwdriver approx 1/8" in to complete pop off
9. remove the 2 phillips screws w/ captive washers
10. remove 3 phillips/hex screws along the bottom inside of door panel
11. on outside/rear edge of panel push the 2 center pins of each in about 1/8"-this allows the clip to be pulled out w/ pin pushed in
12. remove plastic cover (REAR OF SIDE MIRROR)-pull window edge up and back.
13. lift rear of door panel (not hinge edge) up allow hinge edge to pivot around lower pin in door (hinge edge)
14. remove the 2 rt edge "L" brackets (gently pry center plastic pin out) (note the color and replace as removed)
15. slowly peel the clear plastc away from the non hinged end to expose the plastic panel with 3 phillips head screws
16. remove the 3 screws and panel for access to door handle.
17. using access area now available unlatch the rod attached to exterior door handle (unclip plastic to rotate clip up to allow rod to slide out-toward hinged edge)
18. using access area now available remove rod from ext door handle from inside door area
19. remove the 3 -10mm head bolts
20. remove the ext door handle (bottom edge out first)
reverse order to replace door handle

fuse descripiton @ rt side kick panel, info. is on backside of fuse cover, under hood second fuse/relay location rt. side also info on inside of cover

REMOVE OR DISCONNECT

1. Negative battery cable.
2. Drain cooling system.
3. Upper firewall weatherstrip.
4. Upper secondary cowl.
5. Heater hoses from core.

NOTE Blowing out residual coolant from inside the heater core will prevent coolant leakage into the passenger compartment when the heater core is removed.

1. Sound insulator.
2. Rear seat duct adapter.
3. Heater duct.
4. Heater core cover.
5. Heater core.

INSTALL OR CONNECT

1. Heater core.
2. Heater core cover.
3. Heater duct.
4. Rear seat duct adapter.
5. Sound Insulator.
6. Heater hoses to core.
7. Upper secondary cowl.
8. Upper firewall weatherstrip.
9. Fill cooling system and check for leaks.
10. Negative battery cable.

Heres a picture of fusebox,and listed is the fuse locations,1) 10amp left low beam light
2)10amp rt low beam light
3)10 amp instrument& license plate light
4)15 amp, rear wiper
5)15amp frt washers and wipers
6)20amp A/C fresh air fan.
7)10amp rt tail & side marker lights
8)10amp left tail & side marker lights
9)20amp rear defroster &heated mirrors
10)15amp fog lamps.
11)10amp left high beam
12)10amp rt high beam
13)10amp horn, rad fan run on
14)15amp backup lights (m/t),power mirrors,heated seats,heated washer jets,cruise control (m/t)
15)10amp engine electronics,coolant pump run on(v6)
16)hazard signals,glove box lite,shift lite
17)10amp turn signals
18)20amp fuel pump, oxygen sensor
19)30amp a/c, rad cooling fan.
20)10amp brake lights,cruise control.
21)15amp dome light,cigar lighter,locking system,multifuntion indicator,clock,vanity mirror.

Section 12-03A: Air Conditioning System—Manual A/C-Heater 1996 Thunderbird, Cougar Workshop Manual REMOVAL AND INSTALLATION Heater Core Removal

1. Partially drain the cooling system.
   

1. Remove the tube gasket from the heater core tubes.
   

1. Remove four heater core access cover retaining screws, and remove the access cover from the A/C evaporator housing (19850).
   

1. Remove A/C electronic door actuator.
   

1. Slide heater core (18476) and seals from the A/C evaporator housing (19850).
   

Installation

1. Install the heater core (18476) in the A/C evaporator housing (19850) with the tube gasket on the outside of the case.
   

1. Install the A/C electronic door actuator as described.
   

1. Position the heater core cover on the A/C evaporator housing (19850). Install the four retaining screws.
   

1. Refill the cooling system.
   
   
   Heater Core
   
   
   
   
   
   Item Part Number Description 1 18596 Heater Core Tube Gasket 2 18476 Heater Core 3 18B300 Heater Core Cover 4 390747-S2 Screw (4 Req'd) 5 18N267 Heater Core Cover Seal

Disconnect heater hoses at firewall. Probably doesn't matter about hose placement, but I always mark them just in case. To remove the fiber cover under dash, take a flatblade screwdriver and pry out the center pin of the expansion clips that hold it in place. There are four 5/16 head screws that hold the bottom/drain tray cover. Core will pull through the firewall and then down. You may have to silicone/glue or replace the foam seal strips on the new core. Before you install the core, check the distance between the inlet and outlet tubes to ensure they match the openings in the firewall. This saves time. It helps if you have someone on the outside to guide you when stabbing the tubes through the firewall. Replace bottom cover. You may have to hold one of the tubes when reinstalling the first hose to the core. Replace any lost coolant and check for leaks prior to reinstalling the fiber cover. If the cover seal is in good condition, any leak should drain through the firewall, otherwise it may leak inside cab. These days with parts from mexico and others, it is not uncommon to get a new defective part.

1. drain cooling system
2. disconnect heater hoses from engine side of firewall from the heater core,
3. remove nessicary dash panels and covers to access heater box.
4. unbolr heater core and remove.
5. reverse to install.
6. fill cooling system, making sure to purge the air from the cooling system.
7. YOUR DONE

Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/sean_54c3a3dc48a7773c

It's one of the easiest cores to replace that I have encountered. Disconnect heater hoses at firewall. Probably doesn't matter about hose placement, but I always mark them just in case. To remove the fiber cover under dash, take a flat blade screwdriver and pry out the center pin of the expansion clips that hold it in place. There are four 5/16 head screws that hold the bottom/drain tray cover. Core will pull through the firewall and then down. You may have to silicone/glue or replace the foam seal strips on the new core. Before you install the core, check the distance between the inlet and outlet tubes to ensure they match the openings in the firewall. This saves time. It helps if you have someone on the outside to guide you when stabbing the tubes through the firewall. Replace bottom cover. You may have to hold one of the tubes when reinstalling the first hose to the core. Replace any lost coolant and check for leaks prior to reinstalling the fiber cover. If the cover seal is in good condition, any leak should drain through the firewall, otherwise it may leak inside cab. .

ok the number 1 cylinder is by the firewall on the rt side of your engine, it is the closes to the passenger side and is the closes to the pulleys,
and the bank 1 sensor 2 is located at the rear exaust and it is after the catalitic, the rear exaust is the closes to the firewall
and the firewall is the metal betwen the engine and the cab.