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Rear pem / motor blower part number?

Discussion in 'Roadster 2008-2012' started by Logticom, Aug 11, 2019.

  1. Logticom

    Logticom 2010 Roadster Sport | 2015 Model S 85D

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    Zwolle The Netherlands
  2. Logticom

    Logticom 2010 Roadster Sport | 2015 Model S 85D

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    I am back from vacation and took a look under the car to do a double check:

    upload_2019-8-16_12-30-3.png
     

    Attached Files:

  3. nicky _cwt

    nicky _cwt Member

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    Have you done the fan replacement yet?

    is it the right part? Any issue?

    I am planning to replace my fan too
     
  4. Logticom

    Logticom 2010 Roadster Sport | 2015 Model S 85D

    Joined:
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    Location:
    Zwolle The Netherlands
  5. Logticom

    Logticom 2010 Roadster Sport | 2015 Model S 85D

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    And yes, this the right part. You only have to change the connector.
     
  6. nicky _cwt

    nicky _cwt Member

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    Thanks for the reply!

    I am also thinking of passing the connectors between the PEM and the fan.

    there are four pins coming out from the PEM and two wire are connecting to the fan

    Any one here in the group did that and can share some experience?
     
  7. ML Auto

    ML Auto Member

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    PEM FAN Connector pin identification
     
  8. gregd

    gregd Active Member

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  9. nicky _cwt

    nicky _cwt Member

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    Hi ML,

    Thanks for the reply!!!

    There are four pin from the PEM fan socket:

    Pin1. rd/bk--motor fan +
    Pin2. rd/yl--pem fan +
    Pin3. br/rd--motor fan -
    Pin4. br/yl--pem fan -

    There are only two wire (one positive and one negative) come out from the fan.

    Should I connect the fan positive wire to the pin 1, and the fan negative wire to pin3 , and let pin 2 and pin 4 not connected?

    If not, please let me know which wire is connecting to which pin.

    Thanks in advance your help!

    Nicky
     
  10. gregd

    gregd Active Member

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    With the original fan assembly, the two + wires get connected together, as do the two - wires, just past the pair of connectors at the fan itself under the car. See the diagram here: Think I need a new PEM Fan... Anything else to check?

    So to connect to the replacement fan, do the connection yourself before the fan connector. That puts the two circuits in parallel, so they properly share the load.
     
  11. nicky _cwt

    nicky _cwt Member

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    Hi gregd,

    Thanks for the replied. Are you talking about the wiring diagram shown below?

    I am planning to rebuild the wire similar to what you've have done, but I am planning to do it differently. As the motor is 10 years old now, I am planning to buy a new one (image attached). I am planning to bypass the AMP connectors at the fan side (which are problematic). Simply cut it and directly connecting the two fan power cables (one positive and one negative) to the four power cables coming from the PEM fan socket. I am planning to get a new molex female connector (19418000). Then hook up 4 new cables to it. These four cables will run all the way to reach the motor for direct connection.

    To avoid mis-understanding, please help to confirm whether the following connection is correct:

    Connect the wires from Pin1 (motor fan +) and Pin2. (pem fan +) together with the positive wire come out from the fan (twist 3 cables together, wrap with electrical tape, then properly placed)

    Connect the wires from Pin3. (motor fan -) and Pin4. (pem fan -) together with the negative wire come out from the fan (twist 3 cables together, wrap with electrical tape, then properly placed)


    I am planning to skip the PowerPole connection that you've done.


    pem fan.jpg


    PEM Fan Wiring 7-10-20.jpg
     
  12. gregd

    gregd Active Member

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    Yes, that's the circuit. Do solder the connections if possible, or perhaps use a good "wire nut". Simply twisting them together isn't robust enough for more than a quick test. You're running some 10-15 amps through there at times, and if the connection fails, you're stuck on the side of the road. The power pole connector was just a way for me to monitor things, and as a way to feed power back down if the PEM-end fails. Totally optional, of course, but I found it comforting to verify that all was working as expected, since I didn't trust my PEM-end Molex connection fabrication. Turns out it's been fine.

    You do want a connector at the motor end of the cable, if nothing else for the ability to disconnect things for maintenance. I believe the mating connector to the one that comes on the blower is from Deutsch; not sure of the part number. You might give Peter at Gruber a call / email, as they make a pigtail to go from that to the original Tesla cable, and can help you get the parts you need.

    Good luck!
     
  13. nicky _cwt

    nicky _cwt Member

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    Hi Gregd,

    Thanks for the reply. I did not think of the maintenance that you mentioned. Maybe adding a connector at the fan side is better.

    Thanks again!

    Nicky
     

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