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One Blower switch not working

Discussion in '308/328' started by Rod, May 22, 2019.

  1. Rod

    Rod Formula Junior

    Jan 18, 2004
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    Rod
    RHD 328gts,,, The left side blower switch is not working. any ideas where to start? Unlike the right one which works and the dash light appears. Nothing on the left one... any pointers would be appreciated..
    Thanks
     
  2. thorn

    thorn Formula 3
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    Aug 7, 2012
    1,996
    Tallahassee, FL
    First, I would confirm that the problem is the switch. Once you've done that, replace the switch if necessary.
     
  3. Rod

    Rod Formula Junior

    Jan 18, 2004
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    Rod
    Swap them over?


     
  4. thorn

    thorn Formula 3
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    You could swap them, or just disconnect the leads and jump them together.
     
  5. Rod

    Rod Formula Junior

    Jan 18, 2004
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    Rod
    Ok.. will give it a try...;)


     
  6. Rod

    Rod Formula Junior

    Jan 18, 2004
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    Rod
    I've had some time to swap the fan switches over and it seems they both work... as do both of the fans.. Fuses seem ok too.

    It looks like I have no power to the switch. can any one suggest what to try next? A colour wiring diagram would be handy is there one available?

    Also I have no power to my two LED heater switches? any suggestions?

    Thanks
     
  7. Lawrence Coppari

    Lawrence Coppari Formula 3

    Apr 29, 2002
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    Lawrence A. Coppari
    I am away from home so I cannot look at the fuse panel decal description on my 328 but do the blowers have separate fuses?
     
  8. mike32

    mike32 Formula 3

    May 13, 2016
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    Uk
    I have the 3.2 mondial drawings, are they the same ?
     
  9. Rod

    Rod Formula Junior

    Jan 18, 2004
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    Rod
    Thanks.. different fuses... Both ok and both have power to them.
     
  10. Rod

    Rod Formula Junior

    Jan 18, 2004
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    Rod
    I don't know if they are the same?


     
  11. Rod

    Rod Formula Junior

    Jan 18, 2004
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    Rod
    It looks like there is one relay for both heater blowers, is it possible for the relay to be faulty?
     
  12. thorn

    thorn Formula 3
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    Aug 7, 2012
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    Tallahassee, FL
    If they share a relay and one blower works, it's not the relay.
     
    Rod likes this.
  13. Steve Magnusson

    Steve Magnusson F1 World Champ
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    Jan 11, 2001
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    Don't have a copy of the euro 328 wiring diagram book (nor any in colour ;)), but this link will get you the 1986-87 US 328 wiring diagram book:

    https://www.dropbox.com/s/vsxcnaheq1igub4/328%20US%201986%201987%20wiring%20diagram%20book%20440_86.pdf?dl=0

    The injection stuff won't be the same, and typically the euro and US have differences in the external light wiring, but the AC/heating system should be similar IME. Of course, if someone's got a copy of the euro version 328 wiring diagram book, please post!
     
  14. Rod

    Rod Formula Junior

    Jan 18, 2004
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    Rod
    Thanks Steve, much appreciated this will help me for now...


     
  15. mike32

    mike32 Formula 3

    May 13, 2016
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    Drop me an e mail address and will send u what i have re 3.2 mondial
     
  16. Rod

    Rod Formula Junior

    Jan 18, 2004
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    Rod
    Sorted... Turns out that the relay was faulty..... They both now blow.. is it normal for a relay to fail?

    Back to the heating and air cone issue now!

    Any one know what the two plugged relays are? can't see them in the wiring diagram?
    Image Unavailable, Please Login
     
  17. Steve Magnusson

    Steve Magnusson F1 World Champ
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    #17 Steve Magnusson, Aug 14, 2019 at 12:26 PM
    Last edited: Aug 14, 2019 at 12:44 PM
    See pages 96-98 in your 376/86 euro 328 OM.
     
  18. Steve Magnusson

    Steve Magnusson F1 World Champ
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    One is a self-latching relay, with a time delay when deactivated, for your interior lights (so they stay on for a while after closing the door).

    The other is the wiper relay (providing the intermittent wiping functionality)
     
  19. Rod

    Rod Formula Junior

    Jan 18, 2004
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    Great thanks.... Do you know what the difference is between the two "A" relays named heater blower and the two "K" relays also named heater blowers?

    One of my "A" relays was faulty which I have replaced. but what do the "K" relays do?

    Thanks


     
  20. Steve Magnusson

    Steve Magnusson F1 World Champ
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    Yes, I noted that the English description of those items was a bit lacking for clarity. They would be better described as:

    75A and 75B (in the wiring diagram Fig 8) = relays running the heater blower motors
    75G and 75H (in the wiring diagram Fig 8) = relays controlling the relays running the heater blower motors

    Whether A = 75A and 75B and K = 75G and 75H, or vice-versa, you should be able to figure out from the wire colors that connect to them. Why they needed two relays working in series to run each heater blower motor = never looked into that...
     
  21. Rod

    Rod Formula Junior

    Jan 18, 2004
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    Perfect, thanks for explaining that Steve....


     

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