thanks for the reply,
i checked the aux fan and it's working, as for the low charge, i will have to take it to the a/c shop to check that out,
i checked the the vacumme out with a gauge and it holds 19-20 at idel and while revving the engine it will increase too 22 .
the vac resivor will hold vacumme for a long time after the car is off ,think its o.k.,
the problem must be in the line that goes into the car
or under the dash