20 Most Recent 1998 Lincoln Mark VIII - Page 5 Questions & Answers

Completely separated systems: the cool comes from an evaporator powered by the compressor, the heat from a radiator from the cooling fluid heated by the engine. If you don't have heat then either the radiator / heater or the controlling valve are clogged or respectively blocked shut. Try to clean them by running a radiator cleaning solution. If that fails the dash will have to be removed to access the heater to remove it and valve for a thorough cleaning and/or replacement.

check fuses for brake lights if fuse is good check for power to brake light switch with test light.

NoOnly the outside

You'll need to have someone scan the computer for trouble codes to proceed.

Should be in a box in the engine compartment near the battery.

any parts store will be able to get one for you. you dont need a part number just year make and model of your vehicle

no it does not there is no ballast