Blower motor

Tiny
DAKOTABRU
  • MEMBER
  • 1992 TOYOTA PICKUP
Heater problem 4 cyl Two Wheel Drive Manual 241000 miles

my blower motor works on high all the time and mostly on low speed but cuts off sometimes on low. The 2nd and 3rd speeds usually do not work and if they do it is only for a few seconds before the motor cuts off. Trying to figure out if it is my motor or switch. Relay is good.
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Thursday, January 17th, 2008 AT 12:04 PM

8 Replies

Tiny
MASTERTECHTIM
  • MEMBER
It could be the switch but I think the problem is the blower motor resistor, this is what brings the voltage down on the lower settings. Hope this helps. Feedback is greatly appreciated.
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Thursday, January 17th, 2008 AT 12:06 PM
Tiny
DAKOTABRU
  • MEMBER
Tim,
Pulled a resistor from a junk yard and replaced the resistor. Same problem (blower motor work on high and low most of the time and cuts off on the 2nd and 3rd speeds. Do you think it is a different problem or possible I pulled a bad resistor from the junk yard?
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Monday, January 28th, 2008 AT 3:43 PM
Tiny
DAKOTABRU
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Tim.
Per your last mail. I think you are looking at the wrong wiring diagram. My blower switch as you are looking at it has its controls displayed like this (Off, L, M1, M2 and High). I think you make be looking at the late model viewed like this (Hi, m2, m1, low and off) vice early model. Unpluged the resistor and motor ran fine on high. However, when I checked the volts with the motor blower on it was less than 1 volt on high. How is that possible? I checked the meter and it is fine. When I checked it on the M2 (the third speed) the voltage actually went up as the fan slowed to a stop! Looking at the correct wiring diagram what wires should I jump to test?
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Wednesday, January 30th, 2008 AT 2:13 PM
Tiny
MASTERTECHTIM
  • MEMBER
The voltage went up because you lost your ground. Now thats from a bad resistor or switch. Now I dont have the schematic in front of me and my computer is down at work. Did you jump the connector at the resistor with the resistor disconnected? The reason your volt meter went to 1 volt is because you are on the ground side of the blower motor and you are actually measuring voltage drop on the ground, its normal.
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Wednesday, January 30th, 2008 AT 4:55 PM
Tiny
DAKOTABRU
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Tim,
What two wires do I need to jump. For example : High to Low, M1 to M2 etc? Not the electrical guy here. The resistor was unpluged but I did not use the fan as a ground. When I wiggle the switch I can sometimes get the fan to kick on but not all the time. I have not jumped the wires because I think you were looking at the wrong diagram. Thanks!
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Thursday, January 31st, 2008 AT 7:25 AM
Tiny
MASTERTECHTIM
  • MEMBER
Ok here is the easiest way to check it. The blower switch sends a ground through the blower resistor. Unplug the blower switch and take a jumper wire. Attach one end to ground and the other end touch to each terminal of the blower switch(you will not short out anything)if you get the fan to work on every speed then your switch is bad. If it still works the same way it does now then you have another bad resistor.
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Thursday, January 31st, 2008 AT 3:59 PM
Tiny
DAKOTABRU
  • MEMBER
Getting to the switch is a major pain. The Haynes Manual does not correctly show how to do it, I have taken the three screws out of the heater control unit and it will not pull out. I might have to go to the dealer and look at the real manufactor's repair manual. I hate dashes. Thanks for your help.
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Thursday, January 31st, 2008 AT 4:22 PM
Tiny
DAKOTABRU
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Tim,
Was the Blower switch. Pain in the rear to get to. You must push up on the switch and pust towards the fire wall to get out. Haynes manual does not give all the steps to get in out. You must remove control plate, radio, glove box and some odds and inn. Very tight space and YOU MUST push up and sldie towrds the fire wall or you will break a clip (I did) but thank God for arrow fletching glue. Thanks Again.
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Saturday, February 2nd, 2008 AT 1:15 PM

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