How do you install navigation DVD on Lexus Is 300?

Go to your local audio dealer, and get it professionally installed.

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Is it normal for a car engine to idle high in cold weather until it warms up?

Yes, but it depends on what "high" means. It shouldn't race, but 200 or 300 extra RPM would certainly be normal. The other thing to consider is the time it takes for the RPMs to go back to normal.

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