Cooling fan on all the time 1999 corrolla

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Davey - 11 May 2008 17:27 GMT

Hi

The Cooling fans are on from the time the ignition is turned on , What
relays should be checked, your help is really appreciated,

Thanks

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Ray O - 11 May 2008 19:26 GMT

> Hi
>
> The Cooling fans are on from the time the ignition is turned on , What
> relays should be checked, your help is really appreciated,
>
> Thanks

If the fans are on, the relays are probably fine.

Check to make sure that the connectors for the fans are all properly plugged
in.

What is the coolant temperature reading on the instrument panel?

What is the condition of the coolant and cooling system, especially the
radiator and thermostat?

When is the last time the coolant was changed?

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Ray O
(correct punctuation to reply)

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hachiroku ハチロク - 11 May 2008 21:41 GMT

> Hi
>
> The Cooling fans are on from the time the ignition is turned on , What
> relays should be checked, your help is really appreciated,
>
> Thanks

I believe these are set up so thatif there is a failure, the fans turn on
rather than stay off. That way, if something fails the fans are on,
rather than not turning on and resulting in overheating. I noticed this
on a Nissan and a Mazda I had.

I think what's happened is the temp sensor mounted to the radiator has
gone bad. That's where I'd look first.

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Davey - 13 May 2008 21:22 GMT

The coolant was changed last fall and the temp is normal range, The
sensor is it actually located on the radiator, or thermostat housing
??

obliged Dav

"$)Chachiroku_+O+A+m+/" wrote

> > Hi
> >
[quoted text clipped - 15 lines]
> radiator has
> gone bad. That's where I'd look first.

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hachiroku - 13 May 2008 21:58 GMT

> The coolant was changed last fall and the temp is normal range, The
> sensor is it actually located on the radiator, or thermostat housing ??
[quoted text clipped - 22 lines]
> > has
> > gone bad. That's where I'd look first.

IIRC, the sensor for the fan is located in the radiator. Follow the
wiring from the fan back, and you should see where it plugs into the
sensor. It may make a stop at a relay first.

They didn't have a '99 at AutoZone, they did have a '96. Try this:

http://www.autozone.com/addVehicleId,2145902/initialAction,repairGuide/
shopping/repairGuide.htm?pageId=0900c1528006f16e

This is the switch that installs into the raditor:

http://www.autozone.com/N,16300115//shopping/partTypeResultSet.htm

Get to know AutoZone. They have a lot of useful information and pictures
that can identify parts and give clues as to where they go and how to get
them out! ;)

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