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Slow Start on 2004 Scion xB

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In cold weahter my car takes an longer to turn over than it does in the summer months. it is about 4 seconds to the less than 1 second in the summer. Should i have the altenator or battery replaced, they are both original to the car?
(2) Answers
(1) Comments
get the battery checked first. the colder it is outside, the less power it has. in the real cold weather, you really need a good battery to spin the motor over at the right rpms to get it to fire off right away.
battery test is very easy and is free in a lot of shops.

Roy