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Steam coming from under your car’s hood?

Most vehicle manufacturers recommend that when overheating, you increase your idle RPMs by 200-300(aprx) to increase flow while not increasing temperature. By advising people to rev their engine in dead traffic, and that more revs=more cooling, you may be inadvertently directing one to make the problem worse, by say, running at 3500-4K RPM and seizing the motor(due to a loss of coolant or the motor overworking itself while not getting good flow).

I'm not dogging your business, or you personally, this is my interpretation and merely a suggestion.
 
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We actually diagnosed a bad fan clutch long distance with my daughter when it overheated idling in park. Topped off the coolant, let it idle and after a while the temp gauge was climbing. I had here raise the rpms to 1200, and the temp gauge dropped like a rock. She drove it home 60 miles, and just nursed the idle speed at stops a bit. New clutch fixed it.
 
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