I have been in school in Grenada and am visiting my brother in Virginia and am getting ready to head to the Great White North in a couple days. I think my blood must have thinned out because after shorts and flip flops for 5 months I am freezing here. I have a 91 jetta NA and my heater blower works on speeds 1,2,3 but not on high. I checked with a test light and the switch is sending power down the wire when in position 4 which is a yellow with a red stripe off the switch. The 4th position should have the full 12V going to it but it is one of the smallest gauge wires coming off of the switch so where does it go from the switch? I figure it must go to a relay. Can anyone give any suggestions on where it goes from the switch? I just put a heater core in the car but am unaware of disconnecting any wires. Thanx and Merry Christmas