Question about 1997 Jeep Grand Cherokee
Okay, first , you have 2 separate problems.
1. Blower Motor
2. Mode Control
Although they both have to do with your heating and air conditioning system, they are totally unrelated.
The blower only working on HI is most likely caused by a bad blower motor resistor. It is located in the right side of the HVAC plenum right next to the blower motor. The control switch can also cause this, but it is rare.
The mode control problem is most likely caused by a broken or disconnected vacuum line in the engine compartment. The vacuum hose for the HVAC controls comes from the right (passenger) side of the intake manifold and goes through the dash to the mode control switch. If this vacuum line is not broken or disconnected, then the vacuum switch (mode contol switch) is probably leaking or broken.
Posted on Apr 11, 2011
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Posted on Jan 02, 2017
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