I ordered a mono/heater valve from fastlane for about $80 and installed it. Crossed my fingers and Wah Bam!! We have Cold A/C. Park Place Motors In Houston, Tx. gave me an estimate of $4200.00. They said i needed to change out the evaporator core, vacuum and refill system, and labor. Ouch!
Did it myself with the help of this MB Forum. Total cost was about $100 to put freon in and a mono valve. What A Great Day!! Thanks Guys!