How to Locate the Blower Motor Relay on a 99 Jeep Wrangler. If the highest blower motor speed setting for your 1999 Jeep Wrangler fails to function, and you're confident that the fan speed selector switch, associated wiring, and the No. 11 fuse located in the under-hood power distribution center, are all in good shape, then you may have a defective high speed blower motor relay. Replacing your Jeep's blower motor relay is a simple job that only takes a few minutes to complete, and doing it your self will save the hassle and expense of going to a repair shop.
Connect an automotive memory saver device to the vehicle, according to the product's specific instructions. Open the hood. Loosen the negative battery cable clamp, using a socket and ratchet, then disconnect the cable from the battery.
Open and empty the glove compartment. Lift the glove compartment door to give the check strap a little slack, then slide the looped end of the check strap from the door. Lower the glove compartment door, then unhinge and remove it from the dash panel.
Examine the inside area of the glove compartment opening – the high speed blower motor relay is mounted to the right of the fuse block sticker, on the heating, ventilation and air conditioning unit housing. Grasp the blower motor relay and pull upward – while rocking and wiggling the relay -- to remove it from the harness connector.
Connect replacement relay to the harness connector provision, but make sure to firmly press down on the relay to ensure it's fully seated. Engage the hooks on the glove compartment door with the corresponding hinges on the lower half of the dash opening. Reconnect the check strap to the door. Reconnect the negative battery cable to the battery, then tighten the battery clamp. Use a flat-head screwdriver to widen the battery clamp, if necessary.
Disconnect the memory saver device from the vehicle. Test the blower motor for proper operation.