Make sure you have all your baffles in place so it's only pulling outside air at a stand still .. they love to recirc underhood air if they can find a place, hence all the seals around the frame horns and core support on AC cars. Also the one that goes beneath the radiator, between it and the rail of the core support. At speed it's not a problem because of the positive pressure in front of the radiator ... but at a stand still it can be. Let us know how it works.
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