Question about 1997 Jeep Grand Cherokee

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Heater & A/C Problem for 1997 Grand Cherokee: First, the blower now only works on "Hi". Later, whatever is selected only comes out of defroster vents.

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  • b_webster Apr 11, 2011

    Let me try these out and I'll get back with you.

  • bill johnson Dec 27, 2011

    Mode door is right but the reason it only runs on high and this is for all cars there is a resistor on the heating unit under the dash could be behind glove box follow the wires from the blower

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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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1 Answer

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It could be the control switch, but it is a task to replace. The easiest low dollar solution is the relay. Foe a couple of dollars, you can rule out the switch. Otherwise, if the relay does not work and a diagnostic approach was conclusive on the circuit, then the switch is suspect.

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1 Answer

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1 Answer

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