I am removing and installing a new half rad setup. I am goin to be using only a single fan on the new 3 core HD mishimoto radiator. Stock uses 2 radiator fans. Is one a primary fan? I need to obviously wire to the primary fan, i just don't know what one that is. There is a socket for each fan, one
on the pass side one on the drivers side. Do both fans act together or separately? What one is primary? Thanks in advance

 

I have an Integra, on my car the second fan is for the air conditioning.

The second fan is needed if you're in stop and go traffic, and blasting your air conditioning. In that situation if you do not have that fan, your car will overheat. It's near the radiator, that's why. Happened to me, so after that I just installed the second fan. No problems since.

If you are wondering I have a turbo setup with a 12" slim Blox fan for the radiator - installed as puller, and a 10" slim Blox fan for the air conditioning - installed as a pusher because of the turbo.

If you deleted your air conditioning then you do not need this fan. Hope this helps.

 

The driver side fan is AC. The pass side is the main fan. By the trans

 

Great i did not know one was for ac but makes sense! Thanks and yes i am removing the ac for my turbo install. Thanks for the insight!

 

As mentioned one is the rad fan, [pass. side] only it turns on if rad fan switch closes, the other, [drivers side] is the condensor fan, both the condensor fan and rad fan turn on when A/C is on, it has nothing to do with car overheating, it is for condensor cooling.
A lot of air is needed for the condensor or A/C compresser head pressure will rise above 250PSI and that effects cooling, as head pressure rises, so does the temperature of the air coming out of your vents, if head pressure keeps increasing not only will vent temps. increase but you can blow an A/C line or rupture the condensor or evaporator and/or damage the compressor. 94