Car running hot would it be a good idea to switch to HHR fan?

skep419 said

Would there be a way to make a flap so at hwy speeds it opens up and at stop signs it sucks shut?

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For sure. The be cool dual fan setup on my swinger has that exact thing. You could make a few large cut outs in your shroud on the passenger side and attach some sort of rubber sheet to flap out while driving and close when stopped.