If it works on some speeds and not others, the most likely problem is a defective Blower Motor Resistor Pack. It is located near the blower motor.
under the dash below the glove box
Where is the resistor on 2001 jeep wrangler
The 2002 Jeep Wrangler has 8 valves.
The 2002 Jeep Wrangler has overhead valves (OHV).
The 2002 Jeep Wrangler is a gas-powered vehicle.
The 2002 Jeep Wrangler has an inline 4 engine.
The 2002 Jeep Wrangler has a 5-speed manual.
The height of the 2002 Jeep Wrangler is 5 ft. 10.9 in. (70.9 in.).
A 2002 Jeep Wrangler has coil springs.
The curb weight of the 2002 Jeep Wrangler is 3110 lbs..
The 2002 Jeep Wrangler has a drag coefficient of .58 Cd.
The 2002 Jeep Wrangler's turning circle is 32.8 ft..