The IAC VALVE is located on the left hand side the passenger side that is. You should see a brown and purple hook ups and will see four bolts.
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Cabin air filters not common till after the 2007 model year and beyond. Your 03 Nissan altima will not have one.
http://nissanclub.com/forums/showthread.php?t=21778
The idle control valve is located on the throttle body on the intake manifold. To remove it you need to disconnect the wires and unbolt the valve from the throttle body. Then place the new one on and attach the wires and bolts.
How do you change the spark plugs in a 1999 Nissan Altima. Can not get socket on the plug.
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Unless it is running rough or missing, change them at 90,000 miles. They are screwed into the heads.
What model year? 2005
pull out the transmission