Well i calibrated my thermometer and took the car for a test run on the highway. i got 45degrees at 60mph. This is enough to keep on comfy when it's 80degrees outside, but well see at 100 or 95 here in Texas.

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1984 300SD Orient Red/ Palomino
1989 560SEC
2016 Mazda 6 6 speed manual
1995 Ford F-150 reg cab 4.9 5speed manual