Failure in the blower motor power module (automatic temperature controls) or resistor block (manual AC) may cause the heater blower motor to work only on the high setting. The connector to the power module/resistor block is known to overheat (and sometimes melt). The connector or terminals should be replaced; a replacement connector is available.

Some Jeep Grand Cherokee owners report experiencing engine hesitation and stalling while driving, particularly at low RPMs and stop lights. These issues are often linked to problems within the fuel system, air intake system, or ignition system. Additionally, some owners note that low coolant levels can lead to overheating, which poses a serious risk of significant engine damage if not addressed promptly. Factors contributing to overheating may include insufficient coolant, radiator damage, a faulty radiator cap, or a malfunctioning thermostat. Owners experiencing overheating are advised to stop driving immediately to prevent further engine damage, as symptoms such as smoke from under the hood and a pegged temperature gauge may indicate severe issues like a blown head gasket. It is crucial for owners to monitor coolant levels and address any overheating concerns swiftly, and if problems persist, consulting a mechanic for a comprehensive diagnosis and repair is recommended.