So my seat leathers have finally gone and I fulfilled the ambition to add seat ventilation to the G. Thought I might share the results and some of the things that go into it. Not a thorough DIY as I did this like 6mo ago but will give an idea of how to approach it. Note that you will lose your seat heaters in this operation.

Materials:
- aftermarket ventilation pad
- seat cooler tubes
- - 3" PVC

Tools:
- 14mm socket and probably breaker bar/impact - to remove seat from car and disassemble seats
- philips screwdriver
- several flat screwdrivers for prying
- trim remover - to pry clips
- diagonal cutters - to cut hog rings
- scissors
- thread+needle
- very sharp kitchen knife
- soldering iron
- wire splicing supplies
- zip ties
- hacksaw
- heat gun
- box cutter
- headliner spray adhesive
- multimeter

Steps:
1. Hack up your aftermarket seat ventilation pad to get the motor and plastic pad
2. remove seat from car, remove seatback from seat bottom, remove seat cover, cut seat heaters from seat cover, cut wires from seat heater noting which one is top/bottom, you will need the wiring
3. Cut the white plastic pad inside your ventilation pad to size to fit your seat
4. Using your hacksaw, cut 6" section of PVC pipe to act as the manifold for your blower motor
5. Using your heatgun, box cutter, and clamps, make a manifold for your blower motor to redirect air into your seat shown in Fig. 1
6. Using your very sharp kitchen knife, stab a hole into your seat cushion and cut it just a little smaller than your PVC manifold, you will force it into this slightly smaller hole
7. With the same knife, cut a rectagular recess for your white ventilation pad as shown in Fig. 2.
8. Using scissors, cut some of the cloth from the ventilation pad to seal your seat bottom and prevent air leakage back out, glue this to foam using headliner adhesive, stitch your white ventilation pad to the fabric
9. Wire up you motors *note Nissan uses this interesting design where under "low" power the seat heaters are in series so each have 6v and in "high" they're in parallel so have 12v going through them see Fig. 5 ---- yes this means theoretically means that one of your motors is going to reverse, but in reality it only works in high. No clue why.
10. Install fan/manifold and secure to back w/ zip ties


Fig. 1 underside of seat bottom.


Fig 2. Topside of seat bottom


Fig. 3 backside of seatback


Fig. 4 frontside of seatback. Note black ventilation tube poking through from backside.



Fig. 5 Wiring diagram

I ran out of time, will add more instructions for seatback if needed, it's ALOT easier than seat bottom.

 

Neat! Although I'm not crazy about losing the seat heaters. How well does it work?

I had started a similar project least year. I had picked up switches, wiring harnesses, cooling modules/ducts, etc. from the M35/M45. The cool/heat ***** snap right into the seat heater switch location for a nice OEM look. Unfortunately life got in the way and had to put the project on hold.

 

Love it! I want to find a way to keep the heated seat too. Wish they would bring back the “lower torso” vent on cars 🥲

 

you drive your g35 in the winter???

 

this is super cool, let us know how well it works

 

That's a demo of it in action. I live in bakersfield, ca so never used the heaters. Anyways it doesn't make much of a difference if you go in and turn it on. BUT turn it on after 15mins of sweating and boy do they make a difference!

 

In Texas? Of course!

 

When weather is nice in winter sure.