Jim Grant's Tech Tips
'95 Jeep Grand Cherokee, Hi Speed A/C Blower Only
my air condition will only work on the HI setting on my 95 Jeep
Grand Cherokee. If I set it to any other setting, no air will blow out.
This sounds like an electrical problem but Im not sure. Any ideas?
Jeep may be in need of a blower resistor. When you turn the blower speed
control youre directing electricity though different paths, all
of which go to the blower motor. When you select low speed through mid
speed you are really directing the electricity through a part called a
resistor block. The resistor block has different resistors that control
the amount of electricity that goes to the blower motor. But why only
high speed? When the blower speed selected is high the resistor block
is by-passed and full electrical power is directed straight to the blower
motor. In most cases all that is needed is a new blower resistor block
to return blower speed control.