Alright, so I have a 2005 Nissan 350z DE, and I've run into an issue with it over heating, I've replaced the radiator and got a new water pump, and I am still having the same issue, neither fans are coming on, I am not very mechanically experienced, but the research I've done on this forum says it might be the IPDM, so is there anything else that could be causing that problem and if so how to fix it or any ideas would be greatly appreciated.

 

How high are your temps? Will either fan come on when you turn on the A/C? Have you replaced the thermostat? If no on both, I'd do the tstat, make sure you're using the correct coolant & correct mixture of coolant. Follow the factory service manual for purging the cooling system of any air trapped in the system.

is your temp gauge working? Have you tried swapping relays for the fans with known good ones? If not a fuse or relay, try sending power directly to the fans.

 

I just replaced my OEM 06 fans last month with OEMs at 107K bc they crapped out.
Even if you've replaced the pump and radiator, you still need the fans with Summer and a/c. I agree with Zelduh, see if you can run 12V+ straight to the fans.

 

So neither fan comes on when I turn on the a/c, its got a new thermostat that I put in, and I have not tested the relays yet but i was planning on doing that tomorrow when i'm off work, and i'm also gonna plug the fans up just to see if they work or not, I already bought new fans, but they were universal and I'd rather use the OEM ones if I could. I will let yall know what happens with that tomorrow when I'm done, I appreciate your advice!

 

So neither fan comes on when I turn on the a/c, its got a new thermostat that I put in, and I have not tested the relays yet but i was planning on doing that tomorrow when i'm off work, and i'm also gonna plug the fans up just to see if they work or not, I already bought new fans, but they were universal and I'd rather use the OEM ones if I could. I will let yall know what happens with that tomorrow when I'm done, I appreciate your advice!

 

If you need fans, but on a budget, TYC makes a direct fit with motors, blades & a shroud, all assembled & ready to plug in. If you want OE spec, do what jhc said and replace the motors from Nissan.

https://www.ebay.com/itm/Radiator-An...kAAOSw0dFck7Xp

I have no idea who the seller is, but that TYC part number should pull up anywhere. This one is $94 shipped.