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Blower Motor Works Briefly, Then Trips Off

Discussion in 'Electrical' started by Big T, May 13, 2018.

  1. Big T

    Big T Well-Known Member

    3,499
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    Sep 25, 2009
    Fullerton, CA
    After about 20 minutes, can repeat the process. Motor works for about a minute, then shuts off. I recently replaced the resistor on top of the motor.
     
  2. Will L.

    Will L. Well-Known Member

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    Jan 25, 2013
    Boulder City Nv
    Can you get an inductive amp gauge over the wire feeding it and see if it is increasing load before stopping? If so sign of motor going or loosing it’s ground.
     
  3. WarWagon

    WarWagon Well it hits on 7 of 8...

    8,163
    2,534
    Nov 15, 2009
    AZ
    Check the trouble HVAC two wire connector for melting down.
     
    Will L. likes this.
  4. Big T

    Big T Well-Known Member

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    Sep 25, 2009
    Fullerton, CA
    Location?
     
  5. Big T

    Big T Well-Known Member

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    Sep 25, 2009
    Fullerton, CA
    Have no idea what you're talking about. Please explain with more detail and in simpleton language.
     
  6. ak diesel driver

    ak diesel driver 6.5 driver

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    Feb 7, 2009
    alaska
    He's talking about the blower motor connector . They are known to melt.
     
  7. Big T

    Big T Well-Known Member

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    Where is it located?
     
  8. ak diesel driver

    ak diesel driver 6.5 driver

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    alaska
    if IIRC it's above the motor. Just follow the wires from it
     
  9. WarWagon

    WarWagon Well it hits on 7 of 8...

    8,163
    2,534
    Nov 15, 2009
    AZ
  10. Will L.

    Will L. Well-Known Member

    7,406
    6,008
    Jan 25, 2013
    Boulder City Nv
    I was sayin Measure amp draw of motor when it is running and as it dies- the connection they are talking about is most likey issue
     
  11. Big T

    Big T Well-Known Member

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    Sep 25, 2009
    Fullerton, CA
    It is the original blower motor. 1999 K2500 with 216K miles.
     
  12. Big T

    Big T Well-Known Member

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    Sep 25, 2009
    Fullerton, CA
    Is this the connector you’re speaking of? It shows signs of melting, but it's single wire. Does that mean the blower motor is going out? If so, which brand at Rockauto: VDO, Four Seasons, TYC?
     

    Attached Files:

  13. Big T

    Big T Well-Known Member

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    Sep 25, 2009
    Fullerton, CA
    I separated that plug. Definitely single wire and definitely melting. It is for the blower motor.
     

    Attached Files:

  14. ak diesel driver

    ak diesel driver 6.5 driver

    12,758
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    Feb 7, 2009
    alaska
    It can point to the blower motor pulling more juice than normal but the connection is also a weak link. Measuring the amp draw is the only real way to tell
     
  15. Big T

    Big T Well-Known Member

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    How do I measure the amp draw? Where do I attache the amp meter for the test? On the exposed wire where it melted?
     
  16. Big T

    Big T Well-Known Member

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    Sep 25, 2009
    Fullerton, CA
    I went out and put the amp meter on it. It pulls 19.6 on the uA setting. After about 30 seconds, it starts to get hot and then it loses connectivity and motor goes off. Jiggling the wire gets the motor going again. So it sounds like the plug is bad. What do you do for a replacement?
     
  17. Big T

    Big T Well-Known Member

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    Sep 25, 2009
    Fullerton, CA
    Blower control module is only on vehicles with auto temperature control. All others got just the resistor.

    Having trouble finding a plug replacement.
     
  18. WarWagon

    WarWagon Well it hits on 7 of 8...

    8,163
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    Nov 15, 2009
    AZ
    I would cut the wires back to where they are not burned, crimp, solder, and tape it up. The connector is for the assembly line. You may have to replace the wire if its coroded or melted a long run.

    Then I would replace the high hour/ mile blower motor as IMO high amp draw is a possibility for failure. So is age and corosion on the connector. AC Delco IMO are quiet vs. cheap loud knock off motors.

    Add a ground strap to the blower motor to body. Ground resistance adds problems to the circuit.
     
    Jaryd and Big T like this.
  19. Big T

    Big T Well-Known Member

    3,499
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    Sep 25, 2009
    Fullerton, CA
    Rockauto does not offer an AC Delco Blower Motor. I looked up the part on AC Delco's site and they give a Part # 15-80665. I do a search and Amazon has this AC Delco Blower Motor for $77.73 with free shipping. However, I get the disclaimer that it does not fit my 1999 Suburban K2500. So I'm confused at this point.
     
  20. WarWagon

    WarWagon Well it hits on 7 of 8...

    8,163
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    Nov 15, 2009
    AZ
    Can you return the motor free shipping if it doesn't fit?

    This is the type of wire repair I suggest. No crimp on this one. Aluminum foil catches drips.

    100_5107.JPG 100_5106.JPG
     

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