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Thread: Coolant sensor question

  1. #1
    Join Date
    Feb 2003
    Location
    Yonkers, NY and Argentina
    Posts
    3,283
    My Cars
    1998 528i 5speed Sport

    Coolant sensor question

    I had a problem with the auxiliary fan not starting when the temp got a little hot. Like past 3/4, but when switching on the a/c it would start right away.
    I tested the relays like you guys said, and the fan worked.

    So i bought coolant sensor, but i got two of them. One goes into the radiator, but the other looks like for an older bmw.

    Where does that second one go, and does it not use a gasket?

    Thanks.

    Sent from my SM-G930V using Tapatalk
    e30 325i, the mighty 4 door granma mobile....Gone
    e39 528i, 4 door sports tank

  2. #2
    Join Date
    Jan 2008
    Location
    Arida Zona
    Posts
    30,108
    My Cars
    z3
    The second one looks like an E60 radiator fan switch but not 100%, the only #'s on that box go to a useless bavarian autosport listing. But the box says 525, which would mean a M54 even if it was an E39, which would mean a totally different cooling system than yours anyways. So yeah, no matter what the second part is wrong

    The first one doesn't quite look like the radiator mounted sensor either and that part # in RealOEM only gives the cylinder head coolant temp sensors for M52/M54 engines (not the early style radiator mounted ones) and the M62 waterpump sensor (which apparently shares a switch with the I6 cylinder head sensors)

    The correct radiator fan switch part number is 61318360857 based on what I'm finding...
    Last edited by BimmerBreaker; 10-18-2018 at 01:38 PM.

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