Why does my a/c stop cooling after 15-20 minutes? Fan stays on but just blowing regular air(not cold). I have a 2001 ford Taurus 3.0 (not dohc).

If you notice, after driving the vehicle for a while, that air stops coming out of the vents, the A/C clutch cycling switch may be bad. The cycling switch is supposed to control the evaporator core pressure at a point where the plate/fin surface temperature will be maintained slightly above freezing. Instead, it may be energizing the clutch too much and the system is icing up. In this situation, simply unscrew the old cycling switch from the Schrader valve-type fitting on the accumulator, coat the threads and O-ring with PAG oil, and install the proper cycling switch. It is not necessary to discharge the refrigerant system to remove the switch. The cycling switch's cut-on and cut-off pressures are readily available in manuals; therefore, its operation can be monitored by the manifold gauge set and you can tell whether its working properly or not. Wear safety glasses.

If you notice, after driving the vehicle for a while, that air stops coming out of the vents, the A/C clutch cycling switch may be bad. The cycling switch is supposed to control the evaporator core pressure at a point where the plate/fin surface temperature will be maintained slightly above freezing. Instead, it may be energizing the clutch too much and the system is icing up. In this situation, simply unscrew the old cycling switch from the Schrader valve-type fitting on the accumulator, coat the threads and O-ring with PAG oil, and install the proper cycling switch. It is not necessary to discharge the refrigerant system to remove the switch. The cycling switch's cut-on and cut-off pressures are readily available in manuals; therefore, its operation can be monitored by the manifold gauge set and you can tell whether its working properly or not. Wear safety glasses.

Thank you very much. It worked! I LOVE MY CAR AGAIN.

Very nice job! Tauruses are great cars. Just remember to drop and clean the transmission pan and magnet, replace the filter, and change the transmission fluid every 30,000 miles.