Does anyone know if this switch 4 wire dual cycle switch has a Schrader valve under it or do you have to discharge the A/C system to replace it. Mine is bad cooling fans run all the time even when A/C is off engine stays cold. I tested the switch and it is bad for sure. I know on my SHO's the 2 wire low pressure switch has a Schrader under it. Don't know about my 1995 Taurus wagon 3.8L. Thanks:mellow: