Ordered thanks for all the advise
@tbounds02 - what they said 👆
I also bought a roll of adhesive firewall/reflective mat. It's the stuff people often use for vehicle acoustics, a bit like Dynamat, but much cheaper and watch the temperature range. Make sure it can take the heat of an engine compartment.
I opened everything up to get behind the angle/back part of the seat, washed everything with a degreaser, and stuck two layers of the stuff over that back angled section that otherwise lets the engine heat bake your crack. (Can I say that on the air?). The stuff isn't that expensive and you can cut and paste sections as you like.
It helped a lot, including for my dog that has to really tuck into the middle seat to be comfortable.
Also, here's a link to one of the prior discussions of the bilge v. radiator fan discussion.
I’m new to the Pioneer but have already discovered the “hot” seat issue. After my research I am still confused whether I should use a bilge fan or 7 or 8 inch radiator fan. Any insight would be appreciated.
hondasxs.com
Mine is a 2021 P1K5. I first installed a 4" bilge fan (put it back in the box), but then went with a generic, reversible Amazon, 7" radiator fan hung from a bar under the seat. I like the heat in the winter, but ride in southern Utah and want to blow the engine heat out of the back most of the time.
I have a reversible in/out blower switch. I don't have an enclosed cab, so I think I'm good with carbon monoxide:
The photo below is from the passenger side, and the OEM black rubber underseat cover is folded to the left.
My 7" radiator fan is hung below the seat on the flat metal bar upper right in the photo.
The fan came with vibration isolating springs, so I used them (shown). It knocks down the interior noise.
The slight angle towards passenger rear turns the air flow across the headers and out of the back.
Best.