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raz50
Regular Member
Joined: 16 Sep 2006
Posts: 1949
Location: Netherlands |
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 temp switch |
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Hello hello 
my question is:
Does the temp switch send a signal to the fan or make mass when it hits the certain temp? I'd say it sends a signal but i want to be sure.
The wiring is completely messed up. Figured if it just sends a signal i can use a general relay and hook the fan up directly to the batteries.
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| Mon Jul 19, 2010 12:53 am |
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avengador1
Site Admin
Joined: 31 Dec 1969
Posts: 4717
Location: Orlando, Florida |
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It's been a while, but if I remember correctly, the fan has it's own switch that is temperature activated. The temperature gauge has a separate sensor and is not a switch.
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FieroDotCom Site Administrator |
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| Mon Jul 19, 2010 9:45 am |
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whitecloud
Moderator
Joined: 17 May 2006
Posts: 3327
Location: north florida, USA |
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Here's a diagram from the Fiero Store website:
http://www.fierostore.com/Tech/Tips.aspx?Part=4cylsensors
I would recommend you use the switch to control the fan, but maybe get one that operates at a lower temperature. The stock one turns the fan on at 220*, just before your motor melts! I think Rodney Dickman sells one that works at lower temp.
edit/note: I have not looked it up, but maybe the fan comes on at 212* or thereabouts. In any case, it's too high a temp IMO.
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| Mon Jul 19, 2010 4:25 pm |
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raz50
Regular Member
Joined: 16 Sep 2006
Posts: 1949
Location: Netherlands |
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oops my bad....i do want to use a temp switch (and i agree on a 'colder' one).....i meant the wiring between the fan switch and the fan. I believe there's supposed to be a relay somewhere in between the wiring.
sorry guys my bad.
the idea is to use a temp switch, then just route wiring from there to a relay, and hook the relay to the batteries and the fan. though i need to know how the temp switch works. does it send out a + at the reached temp or does it simply make mass and no relay is needed?
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| Thu Jul 22, 2010 3:48 pm |
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avengador1
Site Admin
Joined: 31 Dec 1969
Posts: 4717
Location: Orlando, Florida |
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The fan switch completes the circuit to the fan by providing a ground (earth) when the correct temperature is reached. Some people just bypass the switch by grounding the wire directly. The only problem with this is that the fan will run all the time.
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| Thu Jul 22, 2010 7:34 pm |
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whitecloud
Moderator
Joined: 17 May 2006
Posts: 3327
Location: north florida, USA |
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You need a relay. The temp switch is used to activate the relay and send power to the fan. IIRC the original relay is in the very left front corner under the hood, near the headlight. It's probably still there. The wire going to the temp switch on the motor is a .8 gauge (metric size-it's a small gauge wire), dark green and white. Probably all you need to do is find that wire and temporarily ground it and see if the fan comes on. With key on of course. If the fan comes on, you know you have the correct wire and all you will need to do is hook it up to your new temp switch. Another way to verify fan or relay operation is to turn on the AC by pushing a button on the dash with the key on. I think that will work also.
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| Thu Jul 22, 2010 9:56 pm |
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raz50
Regular Member
Joined: 16 Sep 2006
Posts: 1949
Location: Netherlands |
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Okidoki guys! So the switch provides a ground but the circuit needs a relay to provide the fan with enough juice is what i get. The relay is missing and color wires have been changed by last owner. So i want to create a new circuit myself. I can easily get a relay that 'activates' on ground at our local version of 'radioshack' 
thanks for the help!!
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| Sun Jul 25, 2010 2:49 pm |
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whitecloud
Moderator
Joined: 17 May 2006
Posts: 3327
Location: north florida, USA |
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| Sun Jul 25, 2010 10:39 pm |
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