I recently replaced my blower motor as it turned out it was bad, but im havin the same problem as i did before the old one went out. It worked fine for a coupled days then started turnin on and off on its own. Till where it gradually got worse and now rarely comes on at all. I have been told its probably the relay for it which is an easy fix, i just dont know which one is for the blower motor. I have located the relay's but there is no label to which one is which. So any help would be great.
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A bad blower moter resistor can cause the blower to default to high speed only. The resistor is
located behind the lower right side of the dash on the heater box just left of the blower moter.
The fan switch can also cause this problem, but more often then not it's a bad resistor.
Hope this helps.
For 4.0L, inside the engine compartment, on the passenger side firewall, remove the coolant overflow bottle retaining strap remove the coolant overflow bottle and bracket. Unplug the blower motor. Remove the 3 blower motor bolts.Remove the blower motor.Remove the blower motor fan from the motor shaft for access to the motor attaching nuts. For the V-8, you just need to unbolt the blower motor to remove.
Could be two things. Heater control..or heater switch. Or the moter is not recieving the reostat info from control. Check at heater wher wires go into it..as you change positions of switch you should see a voltage drop or increase, if u do then the moter is bad...if u do not then replace the heater control unit. :)