ae13291

iTrader: (8)

do i really have to use the 1 watt resistors on the low and high speed fan wires so the ses light wont come on??? thanks

haacer

iTrader: (1)

First off, resistors aren't rated in watts. They are rated in ohms. I'm not sure what you're putting in, but if it's rated in watts, it's probably a lightbulb...

I'm not sure where you got this information from, but if you plan on triggering your fans by running switched power to the fan motor, I would think twice. Those fans pull a decent amount of juice, and you'll need a switch rated for something like 20 amps. A better option is to trigger the relay which controls the fans with a ground.

Either of these methods should set DTC 77 as the PCM tries to figure out why the fans aren't responding normally. This doesn't turn on the SES light as I recall.

An even better method is to use Tunercat or a Hypertech programmer to change the fan on temp. This way your PCM is happy and your temp can stay down. Just don't set the temp too low. I know hypertech has guidelines in the manual for fan on temps. Running your fans all the time is hard on the fans and hard on your alternator.

camaroguy26

iTrader: (21)

just buy the manual fan switch kit from one of the sponsors, it plugs right into the harness on the pass side fenderwell and has a switch to trigger them on/off. Simplest installation I've ever done and works great. Think it's 60 bucks?

Formula413

iTrader: (1)

I made my own with a switch from Radio Shack and some wire. I just spliced into the wires for the fan relays. I used the resistors specified in the writeup on Shoebox and haven't had any issues with it throwing codes. One nice thing about having a switch rather than reprogramming the fans is that you can run them even when the car is off, for example to cool it down at the dragstrip after a pass. Even if I had my fans retuned I would still keep the switch in there. Just don't leave them on for too long with the car off.

haacer

iTrader: (1)

It doesn't set 77? Or you meant that it doesn't turn the SES light on?

I've just had bad experience with things like this. I had a car where the ignition switch was bad. I wired up a switch to the starter, but not a momentary. Worked fine until my buddy decided he needed to start the car and then couldn't figure out why the starter wouldn't disengage even after the motor was running...

Formula413

iTrader: (1)

The light doesn't come on and my scanner shows no codes.

haacer

iTrader: (1)

I'm glad I'm finally on the same page here. If this is the diagram everyone has been looking at from the beginning, that looks like a good way to go. I still like my fans computer controlled, but I'm sitting in traffic and not on a dragstrip.

Incidentally, I think this diagram also answers the original question.

Formula413

iTrader: (1)

That picture, as it says on top, is for OBD-1 cars (95 and earlier). OBD-2 cars DO need the resistors.

motownZ

cheap easy way to control but did a make own for a beater