Radiator fan runs at high speed all the time wont slow down. 2004 limited V8

Engine is too hot which is burning oil and road dirt off the engine. Sounds like a bad thermostat or a water pump problem. The radiator may be partially blocked too.

Thermostat may be stuck. may need replaced. or could be a sensor.

If you mean the radiator fan, the switch in the engine block that tells the drive train engine module when to shut down is probably bad. This switch/sensor probably needs to be replaced. It is located near the water pump and thermostat.

That is normal

I have the same car

It will vary speed until warmed up or goes
to fast speed when the A/C is on

have a compression test done to check head gasket and cracked head/s. Flushing a radiator is a waste of time as blocked cores will not clear so have a flow test done on the radiator to gauge the number of blocked cores. Check the fins condition on the cores . If you have a viscous fan hub on the fan then replace it ( indications are that it overheats at lights ,when going slow or high rpms going slow but cools down when moving at speed). Check timing and air/fuel ratio as lean fuel mixture will cause overheating Check that the bottom radiator hose is not collapsing under high rpm blocking off the water flow.

Hi Al, I'm glad to help!

Three possible causes: (1) The high speed circuit in the radiator fan motor could be defective. (2) The high speed fan relay Could be defective. (3) It possibly may have a wiring issue. I've seen at times where you can wiggle the fan motor connector that's mounted on the fan shroud and the motor will kick on. If this is the case then replace the hole assembly which is a motor and shroud assembly. Hope this helps and have an awesome day.

its the thermastat and not a hard fix you can also run the wires for the fan direct to battery so that they turn all the time

do you mean high engine speed or fan speed.
if fan speed is slow then motor in the fan is getting bad.
if your talking about running engine, then could be nothing because the sensor tell it not to..like running down the road it cools the car down and engine temp drops slightly enough to cut sensor off.

Not familiar with hydraulic fans, but it seems that yours is not working.

its most likly your fan relay switch located behind the right headlite