My sister has a 93 Taurus GL with the 3.8L engine. Today when she got home, she said the check engine light was coming on. She told me that the light came on when she put the AC on. I looked and she had no Antifreeze, which I proceeded to refill. So I turn the car on and the AC. Something made a horrible noise. I turn the AC off and the engine runs fine. When I go and turn the AC on again, the engine nearly stalls. The noise seems to be coming from around the power steering pulley. I do know the AC pulley is directly below that. Is there something I can do to fix the problem (aka not replace the AC) or is it past help?