The other day I was out driving around getting a few things for the plenum install, I stopped by sonic for 10-15 minutes, as I was leaving I noticed the temp was all the way up. I pulled over at a Napa to check it out.The fans were not on and the antifreeze was going back up into the reservior. I noticed a few days before that each time I turned on the Ac there would be a clicking noise that it would make which it never did before.The air from the Ac didnt seem cold like it normally did. From what I read it looks like its the fan motors. Is this more than likely whats wrong or could it be something else? Car only overheats when its parked and the Ac is going. Any info would be appreciated

 

Could be a motor, could be relay, could just be fuse.

 

Checked the fuse it was fine, having trouble finding the relay unless it's the black fuse like thing. Tapped the motors and the passenger side started working no luck on the driver side

 

I've had several problems with the cooling fans in my 2004 350z. The relays are in the Intelligent Power Distribution Module, or IPDM... Basically yea, the black fuse like thing. If you pop your hood, the IPDM is in the very back corner on the passenger side. Its under its own black plastic cover behind the battery on the left. If you download the maintenance manual, there is a layout picture in section PG, page 26. There are 3 relays for the cooling fans.

 

Might have just burnt out as well. Cant count how man bad rad fans Ive replaced on all of out family cars over the years.