Right rear blower motor makes noise when running then stops when motor stops running
Remove the fan and look for leaves or a nest
SOURCE: Kia Rio - Heater not working fan works but noise coming from fan.
open glove box and make sure that none of the papers from that can get down to blower motor
SOURCE: knocking noise
The CV joints may have gone bad and needs to be replaced, the other thing that would cause a knocking noise is a worn out shock bushing as the wheel goes up and down there is play on the shock to the shock towers from worn out bushings. Recap, check the CV Joints for excessive play and the front shocks. You can buy shock bushings but most likely your going to need to replace the shocks if they have been in that long that the bushings are worn. Good luck and hope this helps.
SOURCE: 2001 jimmy makes a knocking noise when cold. as it
Most likely it is the rockers tapping the lifters. the crankcase has only leftover oil in it at the start, and has to wait for the oil pump to get it there.
I would add a stablizer to your oil...like LUCAS. It may help a bit with a cold engine.
If the knocking is in the piston, then you should see some indication on the spark plugs...like oil or blow-by build up.
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