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Thread: Need help with auxilary A/C fan not on after engine swap

  1. #1
    Join Date
    Jan 2003
    Location
    Windsor, Ontario, Canada
    Posts
    76
    My Cars
    BMW 318i/w M3 engine swap, Jeep YJ Sahara

    Unhappy Need help with auxilary A/C fan not on after engine swap

    I have a problem with my auxiliary fan ‘the electric A/C fan’. For some reason after I did an engine swap in my 96 318i to a 98 M3, the auxiliary fan does not work. I think that it might be something to do with the relays. I pulled the O2 relay out (air pump) and the auxiliary fan turns on, but engine stalls. Plug in the relay and the fan doesn’t work. I am getting a + 12V on both sides of the coil of the stage one relay instead of one being negative to activate the relay. I know that the stage one gets + at the coil form the stage 2 relay, which it is getting so that is OK. I think that this whole ordeal is causing an engine code of ‘evaporator performance/ pressure out of range’ error. Please someone help, this is driving me crazy. I have been looking at the schematics now for 3 hours straight. Email if possible alo@mnsi.net Here is a pic of my releys. I hope I have the right ones in the right places!

    Last edited by Adriano; 02-09-2003 at 02:15 PM.

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