Probably the Temperature sensor in the thermostat housing is bad or the connection is loose or corroded. The signal to engage the A/C clutch typically is used to turn on the electric fan as well, thus bypassing the PCM, computer. Probably the same relay and fuse is used for both on signals, so I would suspect the T sensor in the Thermostat housing or the connection to it.basso4735 said:ok, ill try that tomorrow morning. anyone else want to chime in?
basso4735 said:i just checked out the relay for the aux fan and i dont have one......
the spot where it should be doesnt have anything in it, so even if i put one in it wouldnt do anything. its just an open slot for some reason. hrmm.
Ecomike said:Probably the Temperature sensor in the thermostat housing is bad or the connection is loose or corroded. The signal to engage the A/C clutch typically is used to turn on the electric fan as well, thus bypassing the PCM, computer. Probably the same relay and fuse is used for both on signals, so I would suspect the T sensor in the Thermostat housing or the connection to it.
i have 2. i also have the one on the drivers side at the back of the block near the firewall.Ecomike said:Now that I think more on this, doesn't the 96 use just one temperature sensor for the gauge and the computer? If so your sensor sounds OK, but the signal or wire from the computer to the relay is not working? I still think (guess, based on logic) that it uses the same relay to operate the fan, but two different power circuits run to it to power the relay.
The older models (91 to 95) had 2 sensors one for the gauge and one for the computer. The 90 and older models (Renix) had two sensors and a temperature switch in the radiator for operating the electric fan.
Either way you need find a wiring diagram for the 96 and find out if the ECU powers up the relay in both cases or if the A/C has a seperate signal to the relay since the A/C powers up the fan.
basso4735 said:i have 2. i also have the one on the drivers side at the back of the block near the firewall.
ok, after searching all morning, i think i figured out the problem. while running i unplugged the temp sender in the thermostat housing and the aux fan came on. (yay!) So i assume i need a new temp sending unit?