Is it possible to wire up my dual fans so they both come on at 180* degrees? I think it was the passenger side that kicks on first then the driver's side at 238*. I know if I wire them in a series they'll run at half power but could i wire them up in a parallel?

Thanks for your help!

 

You can wire your fans to both come on at 180 degrees. However, you don't want to do it with the power circuit. Fans draw a lot of amperage and running both fans through the same power circuit can have from unpredictable to catastrophic results. Dual fan manufacturers suggest you don't turn on both fans at the same time because of the draw on your electrical system. But if you want to do it, you need to control the fans using the trigger circuit. Relays allow you to control high amperage circuits using low amperage(trigger) circuits. So if you want to turn them on together, you need to control that through the low amperage circuit and NOT the high amperage circuit. Each fan should have it's own relay for the power circuit.

 

Ok I will take a look at it later and look for it. Do you know where the low amp circuit is?

 

The low amp circuit is in the same relay that controls the secondary fan. I do not have a computer in my car. I believe your secondary fan is controlled by the computer using input from the coolant sensor in the intake manifold. I do not know if rewiring your secondary fan will cause your check engine light to come on. You could try disconnecting the sensor to see what the effect is before doing anything else. But if you decide to do it, I can walk you through the proper way to wire the relay.

 

Each fan has a separate relay and circuit. Each circuit is identical except for the signal control wire-one goes to the temp sender in the head, the other to the ECM. This wire is grounded to engage the relay(s). If you want both to come on with the primary, just tie the signal wire for the secondary relay into the signal wire for the primary relay.

I can't imagine any reason for doing this though. What are you trying to accomplish?

 

Course you can! Otherwise what's the point of having 2 fans? Fans are generally power hungry, just make sure your alternator and wiring are up to the task.

 

OK I'll check and see if anything happens if i disconnect the signal wire from the temperature switch. My main reason for doing this is that it has been very hot here and my car almost overheats every time I go to work. It would probably run cooler if I had the air dam on it, but the roads here are too crappy to try and use one lol you see a lot of people with air dams hanging half way off.

 

If it's boiling over and both fans are running, try a new radiator cap first. It should be replaced routinely anyway.

If it's not boiling over then it's not overheating.

If it continues to boil over after the rad cap has been replaced, find out what the problem is. Possible issues include: leak in system, restricted airflow through the radiator, improper engine tune, etc.

Having both fans turn on earlier will not fix the problem. It should not be boiling over before the second fan comes on in the first place.

 

I know how to tell if a car overheats or not and I said almost overheating. It gets to the third mark on the temp gauge, but does not go past it. Everything else is good and I am currently waiting on a new radiator to get here. I know that it probably won't go past that last mark but to be safe this is what I want to do so hopefully it'll keep it closer to the normal operating temp which 220*ish.

 

Both fans can run at the same time but you should stagger the startup temps because that is when they draw the most amps. You don't have to, but it is suggested.

 

ok, where are the temp switches located at on the heads?

 

The coolant fan switch is on the passenger head between the #6 and #8 plugs.

 

Thanks for your help!!

 

No problem. You should have a coolant fan switch, temp sender, and temp sensor on your motor. The coolant fan switch in the picture turns on your primary fan at a specific temperature. I have a 220/204 in mine now but am changing it to a 195/185 when I get my new fans. One of the other 2 is hooked to your temp gauge. On my car it is located in the front of the intake manifold and has a single blade style connector on it. The third one connects to your ECM and the ECM uses that information to turn on your secondary fan. The temp it turns on at is controlled by the ECM and not the sensor/sender (I'm not sure which it is called). I don't have one of those but I am pretty sure it has a black oval connector on it with two wires. That should be located in either your intake manifold or your driver side head. Hope that helps.