Can i just run it off the stock t stat?

 

Are you asking if the stock t-stat will be able to tell the fan when to come on or off, or are you asking if you have to replace the t-stat w/ a lower temp one? The answer to both questions is no, the fan is told when to come on by a controller w/ a temp. probe that is inserted in the radiator, and you don't have to change the stock t-stat to a lower temp. the stock one works fine.

 

Ok thank you for the help chambers. how big of relay did you use?

 

I used the 75 amp relay from the article I linked to. The taurus fan pulls quite a bit of amps (up to 130) on startup and on high will pull about 43 amps.

 

ok not to bad, the article says a 150 amp i have never seen one that big... just want to get this right the first time

 

Yea I had to order it from this site http://order.waytekwire.com/productd...POWER%20RELAY/ bosch no longer makes them and this Tyco relay (which is 75 amp) is what the bosch part # cross referenced to.

 

I bought my fan for the Mustang from my local Pull-a-part for $15 ( with warranty) and gave about $30 for the temp control kit from PepBoys. You can also use a fan from a 87-94 Lincoln Continental because they are 3.8L and use the same fan as the 3.8L Taurus. This is what mine came off of.

 

Just to update, drove over the hill from Arizona to California yesterday, with the A/C on the whole way, and the temps never got above the halfway point. It's a pretty steep climb and i definitely wasn't easy on her, went about 80 the entire way. Did fine.

 

The problem is with most Aftermarket manufacturers they give "false" output numbers. They may say it flows 2500cfm, but that's at "optimal conditions" which never happens because the thing is plastered to a radiator and it must pull the air through the radiator. Most fans are measured with nothing in front of them. Now imagine putting a fan up against a wall. How much air will it flow now? OEM Fans are measured by actual pull through a specific radiator.
I don't know much about the fan in the link, but I do know that better brands have Closer to actual output numbers rather than completely skewed and false numbers.
Just because it has a large relay and fuse doesn't mean it pulls more air either. That could mean the design isn't as efficient. i would reccomend all that have an E-fan that run other equiptment like stereo's or onboard compressors, to upgrade your alternator or battery.

 

AF_HEMI: i was lookin at the diagram you drew up on the switch relay. Dosent the relay have to be grounded? Do you have the diagram for what is the coil and everything on the relay?