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Everyone has this issue. The problem is where the cabin air is feed from.
The cabin air is feed from two holes underneath the windshield (right under the wipers). Those two holes go into the plastic cover into the cabin air filters. From there, air is feed to the cabin air filters from that big plastic cover (the one that covers half the motor). The cabin air filters sit on top of that. Then air is feed from the sides of that big plastic cover (by the ECU box). Problem is that the motor releases A LOT of heat and lot of it gets trapped underneath that cover and acts like an oven. That heat goes through the plastic cover where the cabin air is being feed from and that's how we get warm air in the cabin.
On our car, we removed the big plastic cover but kept the cabin air filters in there. We did so to try to keep heat under control so that it's not trapped underneath. Problem is, cabin air is A LOT warmer. When the a/c is off, it feels like the heater is on full blast. When the a/c is one, it blows like regular air.
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