Hi there need a little help I have a 1992 Jimmy and my blower for the heater was working I could move it to the right for high to the left for lower but then it stop working there is heat but the fan is not blowing so I bang on the top where the gage is and it started the fan started to blow but now I turn on my vehicle again and I cant seem to get the fan to turn on the fan that blow the hair so I can get heat or Ac but there is heat but not blowing can some one help me please with some ideas Thanks.JR