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why are aux. radiator fans not coming on?
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CarGuru > Mercedes > why are aux. radiator fans not coming on? 8 May 2005 19:46:54

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why are aux. radiator fans not coming on?

Acopper123 6 May 2005 06:23:32
 Here I am again! My two small front aux. radiator fans are not
turning on and I’m running hot because of it. Anyone know what
activates these so I can fix it? Thanks

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T.G. Lambach 6 May 2005 06:51:21 permanent link ]
 Well, there's a thermostat, a fuse and probably a relay.
Take your pick of which of these is not working as it should.
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Peter W Peternouschek 6 May 2005 08:41:31 permanent link ]
 Also check if the fans rotate easily. On my 190E 2.6 the high speed fan
froze and blew the fuse.
Peter

"T.G. Lambach" <tlambach@comcast.n­et> wrote in message
news:S46dnSHdv44yRu­ffRVn-tw@comcast.com­...> Well, there's a thermostat, a fuse and probably a relay.> Take your pick of which of these is not working as it should.


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Tiger 6 May 2005 09:00:05 permanent link ]
 and thermoswitch.


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Trader4@Optonline.Net 6 May 2005 16:19:43 permanent link ]
 Also, don't know where you're located, but in most cars, its unusual
for the aux electric fan to come on unless it's very hot outside and/or
the car is stationary or in slow moving traffic. Normally the regular
fan should provide adequate cooling. I had a problem once on my 300SD
and part of the circuit was turned on by the A/C being on and the
refrigerant temp at the radiator being over a certain temp. It was
controlled by a relay. There's probably another part to the circuit
that turns it on if the coolant gets too hot too.

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Acopper123 6 May 2005 18:24:27 permanent link ]
 "Tiger1" wrote: > and thermoswitch.

Thanks guys! I appreciate the help.

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Vlad 8 May 2005 04:19:31 permanent link ]
 On Thu, 05 May 2005 19:51:21 -0700, "T.G. Lambach"
<tlambach@comcast.n­et> wrote:
Well, there's a thermostat, a fuse and probably a relay.>Take your pick of which of these is not working as it should.

an an electric motor
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Acopper123 8 May 2005 19:46:54 permanent link ]
 "Vlad4" wrote: > On Thu, 05 May 2005 19:51:21 -0700, "T.G. Lambach" > <tlambach@comcast.n­et> wrote: >
Well, there's a thermostat, a fuse and probably a relay. > >Take your pick of which of these is not working as it should. >
an an electric motor

Thanks for all the help on this one guys. I changed my temp control
sensor and tested for current; the motor temp was checked and turned
out to be o.k. A/C wouldn’t kick on fans because there was not enough
pressure in system to activate it. Turns out there is a bad
connection in the cluster and temp is reading erradic.

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CarGuru > Mercedes > why are aux. radiator fans not coming on? 8 May 2005 19:46:54

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