my 1990 Cadillac makes a morse code type sound under glove bx dash then proceed

What is your question?

heat my go from hot to ac or in summer from ac to heat the tac starts blinking off and on the gas meter says I can go 600 mi on 2 gal gas all these codes start blinking on and off mainly a d shows up in heat control. ck engine lights come on but the car runs FINE during this.it will stop for a day or two or it may continue it has a mind of its own is my car haunted lol please respond asap iwant to keep it and hope not expensive to fix