Years before I ever knew anything about the aerodynamics of blocking a grill, I used to block my radiator just to get some heat inside the car. I don't know what it's like on a Paseo, but it was very easy on my old Subaru. I just slipped piece of cardboard in front of the radiator, and I could move it around to adjust how much air it got. I know some other cars don't give you such easy access to the front of the rad.
It's nice when you can be sure that you're running efficiently enough to not be losing energy to heat, except when you're trying to keep your windshield from frosting up from your breath.
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