I swapped my VQ20 for a VQ35 and kept my stock cooling system which is a single core Rad and stock cooling fans. Since i put in the VQ35 the underhood temp's have been really hot(not from reading the temp guage, but jus by openin the hood). Also the cooling fans stay on twice as long as did with the VQ20, and the thing is it affects the AC as the AC lines sit less than an inch from the manifold.

So i going 2 upgrade the cooling system starting with a 2core Rad, new thermostat, and probably a new coolant temp sensor. I want 2 know if there is an aftermarket(upgraded) fan setup available for the maxima???

Will also be removing the compressor and wrapping the lines 2 maintain the temp.

Any advice???

 

I think just upgrading the radiator will solve the problem. I pulled a 455 from a Delta 88 and put in my old Cutlass in place of the stock 350. Same problem, the car starting running warmer than normal. I replaced the 3 row radiator I had with the 4 row that was in the Delta 88 and coolant temperatures returned to normal.

 

with twice the displacement and more horsepower and less air space under the hood it's only logical that the temps will be warmer. What did you have the vq20 in and did you mean vq30? Thought maybe it was a typo until you did it again. Aftermarket radiator and cooling fans will most likely solve your problem.

 

various regions/areas not in the US got a lower displacement VQ, i forget which regions..

 

VQ20DE

This DOHC 24-valve 2.0 L (1995 cc) V6 has bore and stroke dimensions of 76 mm and 73.3 mm respectively, along with a compression ratio ranging from 9.5 to 10.0:1. It produces 150 PS (148 hp/110 kW) to 160 PS (158 hp/118 kW) @6400 RPM and 137 to 145 ft·lbf (186 to 197 N·m) @4400 RPM (lean burn).

It is fitted to the following vehicles:

* 1994–2003 Nissan Cefiro A32 and A33
* 1995–1999 Nissan QX A32

 

Stock maxima fans are fine and pull plenty of air, get a koyo for a 3.5 or something like that.

 

Same car as the Infiniti I35 is what i had the VQ20 in. Comes from countries like singapore/japan/mexico.

Thanks for the advice guys. Guess the new Rad will do along with a new thermostat. We don't have winter here and temps are usually in the 30's C or 90's F