when I purchased my vette it had a electric fan set up. dual 12" flex-a-lite fans with no temp or ac controls. there is a 30amp fuse in line after the relay that has resently started to blowing when I start the car. I tested the fan by running a test power wire directly to the battery which turns on the fan sucessfully. But, when I put the fuse in line it blows. dose this mean one of the motors are bad? before I go and spend money on a new motor I was wondering how I can test to see if the motors are the issue. I am not very good with electrical issues so if there is something I am not see please let me know.

 

The problem is not a bad motor, it's just that both fans are pulling more than 30 amps. A solution cheaper than a new fan would be using two relays. One for each fan.

The other way to do this, is to order a fan controller. This is the best available. It's a variable speed controller, that has inboard relays so all you have to do is hook up the rad sensor, 14V source, and a good ground.

http://www.dccontrol.com/
I would suggest the FK60, but the FK35 will probably work. Both are expensive, but will work a lot better than an IGN controlled relay.

 

Summit racing has a decent fan relay with a sensor that you can bolt to your engine. I personally don't like the "sensors" that you bolt to the radiator. They're bulky, and look like something out of Home Depot. Here is the link for the Summit piece. I think it makes for a nicer install.

http://store.summitracing.com/partde...5&autoview=sku

The problem with not having any kind of controller is that your really straining the charging system. I imagine you've already spent big bucks on a high output alternator. I've gone down the same road with another car of mine. With a thermostat controlling the fans, you may not even need that 160 degree thermostat in the car. With dual fans you have some options.. you can have one fan on all the time and the second come on at the temp window of the "controlling" kit, or just control them both with that trigger. I would suggest a relay for each of your fans, along with separate fuses. The two relays would be wired identially with the exceptiong that they would go to separate fans. (one wire to switched 12v, one to power (12v), one to the thermostat (a ground that becomes grounded at 185 and ungrounded at 170), and one to a fan. The Summit kit comes with a breaker that resets, so thats another plus. Buy another relay and you'll be on your way.

 

Either way...you need some kind of control behind the fans. The engine can't get to operating temp fast enough, and like was said earlier...it puts a huge strain on the charging system.