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The dash lights are incorporated with the parklights. The heater control lights are incoporated with the dash lights. Make sure the dimmer switch is in the full illumination mode. It is possible the park light that is not working is burned out and causing a resistance issue amongst the park light circuitry. Replace the non working park light and retest
Sounds like you have had a lot of fun with this rig
#1 - replace the stereo - that's cheaper than sending yours out for repair.
#2 - Make sure your cooling system is full. You can get an air lock/bubble in the heater core that is really difficult to resolve sometimes. When the cooling system starts to get low on coolant - the heater core is the first to get starved. Physically feel the temperature of the heater hoses at the firewall - they should both be hot - if one is hot and the other not - there is a restriction in the heater core. If neither are hot - your coolant level is probably low. With the engine running you can pinch the upper radiator hose which should force flow through the heater core. Try those things - if you get sufficient heat from other modes - i.e. DEF VENT then your coolant level is not an issue. your controls are your problem - and is this a Auto Temp control system (digital) or manual?
#3 sounds like the ground circuit for Pass side Brake light is not sufficient. Works OK until the park light is turned on. I presume a bulb from the drivers side that worked ok doesn't on the pass side (known good bulb) - the ground circuit needs repair.
#4 the illumination issue - Dash lights/buttons/switches - all those should illuminate together (dimmer controlled)
Radio buttons - refer to #1
Console symbols - wiring connections for the bulbs
Dome lights working ok from rear doors and not the front - probably issues with the front door switches
that's a lot of different things for one car
These lights for the dash are controlled by a rheostat instrument control dimmer switch next to the main light switch for the headlights, it is either turned off (have seen this dozens of times) or it is defective. Below is a picture of the switch assembly I speak of. The thumb wheel next to the knob is the dimmer control.
i would start by checking each fuse in fuse box,[both sides of fuse] with test light 12 volt,[usually there is a metal spot on both sides of fuse that you can check with test light,or volt meter with metal probe on end of test lead wire].