Blower fan on 3500 dodge works some time and some time not

blower on heat or AC fails dead.
but must work on HIGH, does blower high work?
there is blower high relay that most work on high.
the relay closed for high , on high and mode not set to off.(0)
if HIGH works and lower speed do not work the blower resistor is blown out.
causes,
fuse f10 blown.
to test just the blower 1 of 2 pins, ground wire LG/WT light green /white blower must blow or blower is dead. (or key not ON)


the wiring is here.
https://eautorepair.net/Marketing/Default.asp

computer confused by cooling fan voltage/current level. Is the fan working? If yes, may have a short. If no, try hotwiring to battery to see if it's good. If fan works by hotwire, suspect relay is bad. Check all wiring before buying any parts. Relay does not click in until engine is hot. Let me know if you have more questions.

P0483 Engine coolant blower motor, rationality check -malfunction
Causes: Wiring, engine coolant blower motor, ECM

Sounds like you either have something stuck in the blower motor (leaves, pine needles, etc?) or the blower motor bearings are worn out.

it a control switch on your dash

check the reostat which is a resistor that controls the fan speed and also check the wiring to both the reostat and the heater motor

change the blower resister module,if this doesnt work replace the control head

remove steering column covers and check connections at ignition switch..had a truck recently at dealership with similar problem and connector at back of ignition switch was melted..wires were for blower motor and battery feed to switch..had to replace switch and connector/pigtail

check your fan speed resisters usually located in the engine compartment

that is a common for dodge you need to replace the relay for the fan switch i only know this because it happend to me three times on my dodge .hope this could help.

try the firewall... failing that the bottom of the casing

Robert