Question about 1987 Toyota Celica

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Hello, my temp. gauge has just stopped working on my 1987 Celica, so I pulled the wire/plug from the temp. sensor @ the thermostat to ground it, as soon as I unplugged it the fan came on but still no gauge movement, when I grounded the plug the fan disengaged but still no gauge movement. The gauge did check out good from behind the inst cluster though. Also noted that the fan does not engage when the engine warms up (10 min.'s). The a/c is not working but it hasn't worked for a couple of years. thanks, KDA

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You have the wrong sensor ,their is another one somewhere but i do not know where it is

Posted on Mar 26, 2011

  • 2 more comments 
  • kdaiii Mar 26, 2011

    thanks for the quick response, but what would cause that fan to come on when the plug is disconnected . Could it be the temp. switch?

  • Colin Stickland
    Colin Stickland Mar 27, 2011

    no the fan switch is working as it should ,when the contact opens with the heat then the relay will come on as its controlled by the ECU which opens a transistor which then applies current to the relay switching the fan on ,even a car as old as this is quite complicated unlike cars from the 60s ,Sorry about delay but after working all day i get too tired to sit in computer chair ,It makes my back hurt no matter how i try to sit and even the other big old wooden one with a nice cushion is not a lot better .Plus of course if star trek or CSI is on the TV then no competition

  • kdaiii Mar 29, 2011

    Thanx for the help, with that bit of info I searched more and found it on the inlet neck leading to the engine. Grounded it and the gauge went full scale. thanx again. And I understand about Star Trek.

  • Colin Stickland
    Colin Stickland Mar 29, 2011

    glad you sorted it boss and you understand my passion about certain tv programmes .i mean just answered one question ?? then get a reply wheres the gearbox??? am i reading it right or were they born in a field



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