Need some basic electrical advise Options

[Downerman]

This is a Renegade 914 with a small block chevy. Aluminum radiator with dual fans up front that automatically engages with a temp sensor. There are two relays on the fan shroud but when the temp sensor kicks, both fans come on.

So, with that information, I also have a A/C unit that is a popular unit sold for hotrods and other custom applications. It mounts pretty nicely under the passenger side and the install was pretty straight forward. What I just learned though.... the A/C unit will never work properly while I'm filling and testing in my garage and I don't reach fan kick on temp of 195 degrees.

My question is this. I need to hook my compressor power wire additionally to my fans so regardless of what temp the car is at, when the A/C is flipped on, the fans turn. on. I'm worried though because what would happen if I had the A/C on with temp below 195 and fans a blazing, then temp rises and hits 195 and gets the signal from the temp sensor to turn on?

Seems like a fairly simple circuit but do you think I would need another relay from the A/C compressor power wire?

I'm struggling with this and bet someone has been down this road and could maybe help me out.

Thanks,

Dave

[Mike Bellis]

The easy way is to buy a dual fan controller with A/C input. All the engineering is done for you.

http://www.summitracing.com/parts/hda-3647
http://static.summitracing.com/global/imag...ns/hda-3647.pdf

[Downerman]

The easy way is to buy a dual fan controller with A/C input. All the engineering is done for you.

http://www.summitracing.com/parts/hda-3647
http://static.summitracing.com/global/imag...ns/hda-3647.pdf

Thanks so much once again guys. Sometimes electrical has me scared to death. I sure as heck respect it that's for sure. Here's a pic.... The ground and source are not plugged in yet when this was taken but it's working perfectly. I taped up all the bare surfaces and mounted.

Woooooo Woooooo now onto the A/C which has been a bummer. Had to learn the hard way that because I have no belt fan that's always on when the engine is, well, the damn AC would never cool the high side correctly and the unit was whacked out of it's mind. Only really need to worry about that though testing and filling in my garage OR I guess in severe traffic so it's a good thing that I did this.


Dave