Re: E28 '87 535 iS Aux. Fans

[Chris Apostol <caposto@xxxxxxx>]

Same thing was happening to my '86 535i.  I tried new temp switches in the radiator but still nothing.  Solution:  The
coolant temperature never got hot enough to turn them on.  I replaced the low speed switch with an even lower one (82C)
from BavAuto (1-800-535-2002.)  I put the old low speed switch (91C) in the high speed slot (I had to trim the contacts
with sheet metal snips so the connector would fit.)  Now when the temp needle gets just above half, the low speed fan
DOES come on.  I hope it never gets hot enough for the high speed fan to turn on...

Chris

> Date: Thu, 1 Feb 2001 08:22:18 -0600
> From: "French, Cary (CLFR)" <CLFR@domain.elided>
> Subject: E28 '87 535 iS Aux. Fans
>
> Help me understand why both low and high speed cooling fans don't seem to
> ever come on.  Each fan operates when the + and - wires connected to the
> temperature switches (installed in the radiator) are shorted together.
> These fans just seem to never turn on automatically, no matter how high the
> water temperature gets.  The low speed fan operates as designed when the AC
> 'on' button is engaged.  I have not put the temperature control switches in
> a hot water bath to determine at what temperature they switch, however, I
> did replace both with new with no change.  What am I not understanding?
>
> C French
> '87 535 iS
> clfr@domain.elided

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