Fan Override Switch

[TurboKillaZ]

1993 and early-1994 cars don't have dual speed fans and therefore have no #3 (J) fan relay. For these cars you can just round a ground to D2 for the primary fan and F5 for the secondary one.

ok so do I just apply power to D2 to make the fans turn on?

[John_D.]

<blockquote>quote:</font><hr>Originally posted by TurboKillaZ:
1993 and early-1994 cars don't have dual speed fans and therefore have no #3 (J) fan relay. For these cars you can just round a ground to D2 for the primary fan and F5 for the secondary one.

ok so do I just apply power to D2 to make the fans turn on? <hr></blockquote>

Mine is a '98, so I am just going by mine, and by what you posted in your original.

The relay already has power applied, it's just waiting for a terminal to be grounded to complete the circuit. This way, any number of switches can provide a ground, such as when the a/c is on, when the temp reaches a certain level, or when you flip a switch.

Otherwise, all those different sources would have to provide power, and would be tied together and could backfeed each other...

Putting the switches on the ground side simplifies things. So, to answer your question, just run a wire from the terminal, to your switch, to a good ground. When you flip the switch, the relay will kick in and turn on the fan.