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Registered:
February 2005
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 Help!! Engine Fans not working!!!
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Sun, 20 February 2005 07:08
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Hi Everyone,
please i hope someone can help me out here. My uncle has picked up an AE82 Corolla Seca with a 4A-C motor. The car got very hot so he pulled over, the top radiator tank burst open. So he got it towed home, now it has a new radiator & thermostat. The problem is that the cooling fans won't kick in when it gets warm. I did the test where you disconnect the thermo switch, the fans run. They also run with the aircon on too. We have replaced the thermo switch with a new one & checked all fuses & relays (we replaced the relays too). We can't figure it out, can anyone shed some light on this situation? We're getting frustrated now.
Cheers,
Adrian.
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Location:
Brisbane
Registered:
June 2003
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Re: Help!! Engine Fans not working!!!
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Sun, 20 February 2005 12:33
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wildshot, but because they are not ECU controlled - only through switch off the A/C or the thermoswitch, it has to be something to do with the switch not earthing proplery...is it possible theres corrosion around the thread or its not making enough contact to ground out?
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Registered:
February 2005
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Location:
sydney
Registered:
March 2003
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Re: Help!! Engine Fans not working!!!
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Sun, 20 February 2005 21:29
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those switches work in reverse
when the wire is earthed the thermo does not work
when u unplug the thermo fan wire it looses the earth and then they should come on
if they work when u unplug the wire then everything electrically seems ok
did u try unpluggin the wire while car was running
see if it works then
might be something else like water blockage so no water goes to thermo switch
for now just leave the wire unplugged so it runs all the time
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Registered:
February 2005
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Re: Help!! Engine Fans not working!!!
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Mon, 21 February 2005 09:29
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Sideshow, yep that makes total sense! When you unplug the switch hot/cold, engine running or not the fans run, so there is nothing wrong with the electrical system. When tested with the multimeter to see if the switch was working i did a volatge test, positive from battery to terminal on thermo switch, i got a 12.4v reading when the engine was hot or cold, meaning there was always an earth. I think the new thermo switch we got must be faulty, we picked it up from repco, probably should get a genuine toyota one, i don't think there is a blockage, cause we changed the thermostat and it was clear there.
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Location:
Somewhere on a dirt bowl ...
Registered:
August 2004
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Re: Help!! Engine Fans not working!!!
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Mon, 21 February 2005 10:44
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Before you take the thermo switch back dip into boiling hot with the multimeter hooked up to it, it should go open circuit. If it stays closed take it back.
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Registered:
February 2005
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Re: Help!! Engine Fans not working!!!
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Tue, 22 February 2005 10:07
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Ok it's fixed! The circuit wasn't working properly after all. The single fan corolla's run a single four pin relay, the twin fan corlla's have four pin, three pin & five pin relays. The five pin one controls the other two. We replaced the five pin relay and bob's your uncle now working fine. The temp never goes over half way!!
Thanks for your help guys!
Adrian.
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