| quote | Originally posted by Jeb Stuart:
Thanks, everyone, for taking the time to make sugestions. So where is the snsor that checks the coolant temp on a SII 3800SC? |
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Just left Atlanta earlier this year and Atlanta traffic is the truth serum to whether or not your cooling system is up to par. Your fan appears to be fine, with a 3800 SC and matching PCM your cooling fan is/should be computer controlled. The way I would approach this problem is to identify the fan request wire from the PCM and the fan relay control wire. Since the fan comes on with A/C on you don't have to do anything with the fan request wire although this would be the wire to manipulate if you want full control of when the fan turns on.
Once you identify the fan relay control wire from the PCM, use a multimeter to check for its continuity all the way to the fan relay, usually it is the ground for the energizing coil. If that's good check the fan activation temp in the code to make sure it is set at the correct temperature. You also have to make sure you have a coolant temp feed to the PCM although by now you would have a code if you did not. I suspect you don't have the relay control wire connected to the relay which is already confirmed good because the fan comes on with the A/C. It is possible to have a dual pattern activation where the Fiero A/C circuit turns the fan on with use and the PCM turns the fan on at the commanded temp which would explain why your fan works in one situation and not the other.
The proper way would be to have the fan fully controlled by the PCM where the request wire would be tied into the A/C control head circuit so that the PCM turns the fan on when it's needed be it for the A/C or engine temp threshold being reached.