I have a 1990 lincoln towncar that blows cold air then heat
What temperature are you trying to get? If it's not cold all the time, you might need freon.
uh oh dont let mr. bradley see that you called it freon. The correct term is refrigerant he got on to me about it!
Mr. Bradley? - did Bob N / Judge Roy / Oper 13 take on another personality? -- At least I didn't call it R12 this time...