Quote:
Originally Posted by thorloki
That is hard to gauge. I haven't been opening heat flappers until engine gets up to normal operating temperature. That time also depends on if I am driving on city streets or freeway. I live a couple of minutes from a freeway so once I am on the freeway engine reaches normal operating temperature quickly and I get heat a lot sooner than if I am on city streets.
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Just an FYI, it's pushing heat from your exhaust manifolds, which start getting hot as soon as the engine is started, so no need to wait for the engine to get warmed up. On backdated heat configurations, a heated up cabin has more to do with fan speed than engine temperature.