Found system heat staying on due to stuck sequencer. Found burnt wiring and sparking where wiring meets heat kit. Need to replace heat kit and sequencers but supply house informed me those parts are no longer being made.. Evaporater coil is very rusty and corroded and likely to leak. System runs on r22 refrigerant which is being phased out by the epa in 2020. Found capacitor to be extremely weak causing compressor to not turn on. Found electrical pitting on main electrical switch and in disconnect box. Due to condition of system, recommend upgrading system to a more reliable, more efficient system. Sending Garrett out for a free estimate.