Question about 2003 Nissan Altima

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At how many miles is the radiator supposed to be flushed? Also, what about the timing belt? I have a 2003 Nissan Altima and don't have the maintenance guide. I have kept the oil and filter changed on a regular basis. Right now it has 125,000 and the radiator has never been flushed. Thanks. K. Stidham

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2003 Nissan Altima 2.5 S maintenance manual says 60 k miles or 48 months to flush the coolant and replace it. 105 k miles or 84 months replace the timing belt.

Posted on Oct 06, 2010

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4 Answers

What parts do I need for a tine up on a 2003 Nissan Altima?


  • Plugs - every two years for the single fire plugs up to 90,000 miles for the split fires etc.
  • Wires - every two years on up depending on quality of wires.
  • fuel filter - every 15,000 miles or so.
  • air filter - as needed but every 10,000 miles or so.
  • antifreeze flush - 30,000 miles for green, 75,000 for organic (Dex-Cool style)
  • transmission fluid flush - every 40,000 miles.
  • transmission gasket and filter change - every 100,000 miles.
  • timing belt - every 100,000 miles.
  • Rotate the tires every 6,000 miles or so.

Regards, Tony

Jun 07, 2011 | 2003 Nissan Altima

1 Answer

I have a 2003 Nissan Altima. Do I have a timing Chain or Belt. How long does the timing chain last? I have 195,000 miles on my car.


Timing chain. Normally they will last for at least 150,000 miles or longer. If it becomes noisy or car is hard to start, backfires, or performance is sub-par have it checked.


May 17, 2011 | 2003 Nissan Altima

1 Answer

At what time and mileage intervals should the radiator be flushed on a 2003 Nissan Altima? I bought my car used and the manual was not with it. Thanks.


To be honest, just every now and then. For the first two or three times, if you don't really know it's past schedule, flush it the first time, then maybe 50K miles, then maybe 100K. Dex-Ron vehicles (AKA GM headgasket eaters) often suggest 250K, but just go with a hundred thousand miles. That way you know sooner if something is oddballing.

Oct 01, 2010 | 2003 Nissan Altima

2 Answers

03 nissan altima overheats,replaced both thermo 3days ago,water pump change was changed 11 month ago, today rad flush was done


A car when overheats means two things: (1) Timing may be off including electrical (2) bad head gasket. Chec for code reading with a OBDII reader to be more .
May need a tune up!

Jun 29, 2010 | 2003 Nissan Altima

1 Answer

How to replace knock sensor in 1995 nissan altima


remove the intake manifold ,remove radiator ,remove radiator intake and outake housing, remove fan ,remove all belts: power steering, alternator and if you have a/c, remove harmonic balancer ,remove timing belt covers, remove timing belt remove intake housinng once you have remove all the above, your freaken engine will look naked, you can see the location of the knock sensor is locate in the engine valley

Jan 20, 2010 | 1995 Nissan Altima

1 Answer

Even when warmed up and driving my 2003 Nissan Altima changes gears pretty hard.


You need a transmission flush through the radiator and transmission
a new tranny filter and clean the pan.If this still happens then your transmition is slipping gears because of shaved gears this is noticable
when there is lots of metal particles or chunks.If this occours than i suggest a rebuild or used transmition.

Jan 15, 2010 | 2003 Nissan Altima

2 Answers

Flush the radiator


wins radiator flush

Jun 01, 2009 | 2002 Nissan Altima

2 Answers

Timing belt 1994 nissan altima


most timing belts go much longer. i am asuming the dealer recommends it or you probably wouldn't ask.it is not an easy or cheap job. i am a big fan of if it ain't broke don't fix it. my truck has almost 200k with the original on...some motors are damaged when the timing belt breaks..ask your dealer why it is recommended and go from there..Good luck

Jan 20, 2009 | 1994 Nissan Altima

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