That won't work in the new cars. Besides, if it is 80-90F outside, it will be 10F warmer inside while driving. The engine bay air does not come into cabin vents, thank goodness.
The heater core thermostat for the early red blocks actually turned off the flow of coolant, when it worked. The white block engines have the coolant flowing constantly, so opening the windows doesn't help. I keep thinking about my VW beetle, either there was no heat or my right foot burned.
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Keeping it running is better than buying new
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