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redpoint5 · 05-07-2018, 04:58 PM

I wouldn't bother with aftermarket cabin fans.

The Prius runs 1 radiator cooling fan whenever the AC is on, so this usually keeps engine coolant temps reasonable even with a partial grill block. I'd experiment with blocking the lower grill but keep an eye on a temperature gauge because running the 2nd radiator cooling fan is not efficient. You'll lose AC cooling efficiency with the grill block, so there is a tradeoff. In CA, I'd probably not block at all.

Seems like you're already doing what you can to improve efficiency.

I'll park with the windows down and doors unlocked, but then again I don't have any valuables in the car, and I don't live in SoCal.

05-07-2018, 04:58 PM	#2 (permalink)
redpoint5 Human Environmentalist Join Date: Aug 2010 Location: Oregon Posts: 12,945 Acura TSX - '06 Acura TSX 90 day: 24.19 mpg (US) Lafawnda - CBR600 - '01 Honda CBR600 F4i 90 day: 47.32 mpg (US) Big Yeller - Dodge/Cummins - '98 Dodge Ram 2500 base 90 day: 21.82 mpg (US) Chevy ZR-2 - '03 Chevrolet S10 ZR2 90 day: 17.14 mpg (US) Model Y - '24 Tesla Y LR AWD Pacifica Hybrid - '21 Chrysler Pacifica Hybrid 90 day: 38.47 mpg (US) Thanks: 4,359 Thanked 4,515 Times in 3,473 Posts	I wouldn't bother with aftermarket cabin fans. The Prius runs 1 radiator cooling fan whenever the AC is on, so this usually keeps engine coolant temps reasonable even with a partial grill block. I'd experiment with blocking the lower grill but keep an eye on a temperature gauge because running the 2nd radiator cooling fan is not efficient. You'll lose AC cooling efficiency with the grill block, so there is a tradeoff. In CA, I'd probably not block at all. Seems like you're already doing what you can to improve efficiency. I'll park with the windows down and doors unlocked, but then again I don't have any valuables in the car, and I don't live in SoCal. __________________ Gas and Electric Vehicle Cost of Ownership Calculator Give me absolute safety, or give me death! Last edited by redpoint5; 05-08-2018 at 04:13 AM..