How do dual radiator fans work?

[my-deja]

Can someone please give me a clue how the dual cooling fans on an 89
Buick should function, turning on and off, one or both at a time?

Also, is there a simple way of testing these dual fans?

I notice one fan coming on, should this be, or should both fans come on.

Note that there is no overheating problem.

Thanks.

[Larry Smith]

my-deja wrote in message <3A03F5C3...@my-deja.com>...

Äs I remember the technology, the fans are staged. They do not both
come on at once.

Perhaps another post will correct me.

[Mike Walsh]

On many vehicles one of the fans will come on when the air conditioner
is on; the other will come on when the engine coolant is hot.

--
Mike Walsh
West Palm Beach, Florida, U.S.A.

[Acer V]

I've seen the dual fan setup worh both way:

one fan when a/c on, (push low speed), second fan for engine cooling as
needed (pull high speed)

both fans on low (a/c), both on high (cool).

another setup (weird) with pull single fan: low for engine cooling, high
for a/c.

this was audible observation, so might be mistaken, altho i did try to
make sure i am not :)

/Acer V
--
dum spiro, spero
http://student.ucr.edu/~siddim01

[Bill Kitterman]

My thoughts lean toward the fans being staged... when you run your scan tool
on the computer it should test the fans for operation.

"my-deja" <deja...@my-deja.com> wrote in message
news:3A03F5C3...@my-deja.com...

[Frank]

In article <t0apmr8...@corp.supernews.com>, "Bill Kitterman" <bki...@bcn.net> wrote:
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>From: "Bill Kitterman" <bki...@bcn.net>
>Newsgroups: rec.autos.tech
>Subject: Re: How do dual radiator fans work?
>Date: Sun, 5 Nov 2000 08:55:09 -0000
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They are staged, based on temperature sensed. The higher the ambient air
temp/engine temp combination, the more the need for the second fan to be
turned on. At lower temps, only one fan is used.

Frank B.

[George Jefferson]

:Can someone please give me a clue how the dual cooling fans on an 89

:Buick should function, turning on and off, one or both at a time?

on my 92 the first fan is temp controlled, the second
fan goes on with the AC (apparently not temp controlled).

--
george jefferson : geo...@sol1.lrsm.upenn.edu
to reply simply press "r"
-- I hate editing addresses more than I hate the spam!

[Lee G. Havemann]

my-deja <deja...@my-deja.com> wrote:
: Can someone please give me a clue how the dual cooling fans on an 89

: Buick should function, turning on and off, one or both at a time?

: Also, is there a simple way of testing these dual fans?

: I notice one fan coming on, should this be, or should both fans come on.

: Note that there is no overheating problem.

: Thanks.

The dual fans on my '89 Firebird come on simultaneously - they are both fed
by the same wire off of the relay. You may want to swap the wires on the
fans (it the plugs reach) to see if they both are working correctly.
Or, turn on the AC and see if both fans come on then...

--
remove the .invalid before replying
Lee Havemann, Comp Ops Dir. HSH Associates (973) 838-3330

89 Firebird Formula
ZZ4 Crate, WS6 package, 9 bolt rear, Hotchiss and Lakewood suspension
Edelbrock TES Headers, Random Tech 3" cat, SLP exhaust and lots more.