Hi... recently bought a 94 pu w/ 2.4 engine(22re), blower would only run on high,so I got a new fan resistor & installed it. I now have 4 speeds on the switch but they run very weak,only high setting has any great airflow. The truck has A/C also... is there something else I can replace to get better air flow on the 3 lower settings? Thanks in advance,Cal
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Re: Heater fan is SLOW....
Check to be sure that nothing has made a nest in your blower motor.. I have found mouse nests, rats nests, and even dead snakes inside the blower motor on these trucks..with all the extra weight inside the blower, the low speeds turn slow and will burn the resistor out quicker.
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You are talking about your blower fan for the air conditioner and heater right? More information will be needed to solve the problem.
When you say it barely changes speeds, does that mean it doesnt speed up, or doesnt slow down? By that I mean, is it "stuck" on low, or high?
Most blower fans run at different speeds through the use of a multi-stage resistor built into the fan switch circuit. Low speed is a high value resistor, medium speed is a low value one, and high speed is the fan running without any resistance.
If your fan is running on high and doesnt seem to want to run on lower speeds, the resistor pack may be failing. If the fan is running on low speed only, it may be that the fan itself is beginning to fail, or that the lubricant in it has gotten gummy.
I can't speak to the cost, a local dealer can do that. As for the reason the fan runs on, it sounds like either a stuck power relay (location should be in the owners manual) or a bad fan speed regulator. Since the fan is stuck on high, I suspect the fan speed regulator is bad. On some cars the regulator is part of the fan assembly, and on some it's separate. Also, there is a possibility you can repair the circuit board, assuming it's something as simple as a burnt out diode. Best of luck!
The heater blower is normally controlled by voltage sent to the blower via a resistor network.
In this case it seems that this unit also called the fan resistor is defective.
I assume that 4 is the position where the blower is running HIGH and in this position the blower is powered directly without using resistor for lowering the speed of the blower. In step 1 - 3 the blower is powered via the mentioned resistor network.
In my opinion the resistor network is defective.
Replace it !!!!.
Hello Imrevoy. When this symptom happens your blower motor resistor has gone open circuit. When on the high fan position it sends full battery power to the fan so it bypasses the resistor. That's why, now how to repair? Here's the manual instruction.
REMOVE GlOVE COMPARTMENT DOOR
REMOVE ENGINE ECU
Disconnect the wire harness clamps.
Disconnect the connectors.
Remove the 2 bolts and engine (and ECT) ECU.
Two way flow heater models only: REMOVE AIR DUCT (Motor cover)
Disconnect the control link.
Disconnect the connector clamps.
Remove the screw.
Release the claw and remove the air duct.
REMOVE BLOWER RESISTOR
Disconnect the connector.
Remove the 2 screws and blower resistor.
INSTALL BLOWER RESISTOR
Two way flow heater models only: INSTALL AIR DUCT
INSTALL ENGINE ECU
INSTALL GLOVE COMPARTMENT DOOR
There you are, I hope your repair goes well. Thank you for using FixYa.
Check the heater control switch,,,,,and the number of wires at the heater motor....Some motors have more than one winding...in which case there will be three or more wires going into motor..there can be burnout in those windings and will require a new motor....check the plug which attaches to the motor....can be bad connection...or at the switch.....but if there is only two wires....then the heater switch uses resistors to slow down the different speeds...and direct connection for high speed....and the problem is definitely the switch...
probley the restor that gives the a/c heater fan motor its power for the low/ medeam speds has gone bad and onley letes it run on high speed because it gives the fan motor full battery voltage on high speed. it should be located in the heater box were the fan will blow air across it to cool it when it is in use GEORGE STIRBER DBA AUTO ENGINEERING