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The older model 2003 Altima didn't put heat into the cabin if the engine is idle. It has to move.
I learned that when I got stuck in the winter on the highway. The cabin was getting colder by the minute
I don't know whether Nissan have modified that design or not.
Also, the fuel injector pushes a lot of fuel when it's cold. So once you turn on the engine while cold, you'd better warm it up until the engine consumes the excess fuel from the injector. I learned that the hard way in the winter. I had run the engine for a minute before turning it off. Then I couldn't turn on the engine anymore. I had to call tow truck. The driver was really nice. He told me that secret, since he had had many encounters with Altima.
I learned that when I got stuck in the winter on the highway. The cabin was getting colder by the minute
Also, the fuel injector pushes a lot of fuel when it's cold. So once you turn on the engine while cold, you'd better warm it up until the engine consumes the excess fuel from the injector. I learned that the hard way in the winter. I had run the engine for a minute before turning it off. Then I couldn't turn on the engine anymore. I had to call tow truck. The driver was really nice. He told me that secret, since he had had many encounters with Altima.