2004 XJ8 Sometimes the A/C fan motor wont blow.After driving for a while it comes back on

check wiring on fan and switch if you had them off. Sounds like you have ground wire mixed up with power wire.

first i would try checking relays,fuses, and the ground cables. replace as neccesary....now for checking the ground cables.....i would disconnect them and try scuffing them up with a wirebrush or something that will scuff up the metal a little bit then re-attach them.....test the blower and see if it works.....let me know what happened.

is your electric fans running constantly. and most times then not you`ll need a water temp sensor or water temp relay. usually the temp sensor on that model comes usually next to the thermostat with a little wired plug on top. or on the radiator. either way pull the plug while the motor is cold. unscrew the sensor and screw the new one in and replace the electric plug back on top of the sensor. 2 things: Cold motor, have every thing set up and ready because when you take out the sensor the coolant will start to come out. you will not loose much if you work quick. keep rags or paper towels below the sensor to keep coolant off the motor and smelling when it gets hot. you have also pour or hose off coolant after your done installing the new coolant temp sensor.

start with using a meter to test for power start from fan back to switches need to check harness and connectors

most blowers are on the front passenger side under dash

does it blow on any speed??? if not turn the blower on and find it usually under the left side of the dash, take any object and knock on it, if it then works, it needs replacement

check the connections at the blower motor and blower resistor under the right sie of the dash. If the connections look green or burnt replace the resistor connector

chek the blower regulator its a common problem on digital a/c control

Most likely it does, if you can hit the motor and it will run. I can't say for sure but you might want to chk. to see if you got a heater blower motor resister. There located (if its got one) around the heater motor and it controls blower speeds, might be worth checking out.

SOUNDS LIKE THE BLOWER MOTOR CONTROL MOULE BEHIND GLOVE BOX PLUG ON TOP TWOPHILLIPS SCREWS HOLD IT IN