the wifes 90 II ac clutch was kicking on and off off at idle on with gas thought low on freon put my gauges on it checked good so took it to shop they said needed new clutch i had them remove freon i installed new compressor an clutch filled with oil new freon never had this happen before even when ihad my jumperwire on to put freon in the ac clutch kicked on and off took forever to charge still have same problem 300 bucks later cools ok when on the gas clutch kicks on an off at idle is there an relay or switch that could cause this i m lost and don t trust the shop