Question about 2000 Nissan Altima

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Car overheating problem

I replaced the radiator, and I have been driving the car and letting it to cool down to add more coolant in order to get rid of the air pockets. This morning, I drove my car to work. The temp gauge was a little higher than the middle position. But at a certain time, it dropped back to the middle position and then climbed up a little again. Is this normal? Or maybe there are still air pockets in the system? And when the car reaches its normal operation temperature, both of the fans would turn on (AC is off). Is this normal too? Thanks.

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Try replacing the thermostat. Sometimes they can create a problem like this when they are not opening and closing at the proper temp.

Posted on May 11, 2009

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My Nissan urban keeps overheating after it got overheated what could be the cause


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How to Flush the Cooling System.


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2 Answers

Having issues with a 2000 chevy impala overheating have changed the radiator and the thermostat fans seem to be working ok but overheats at idle in stop and go traffic, after a certain amount of time it...


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1 Answer

I may have added too much coolant. After adding it, I drove for about 15 minutes. A few hours later, the tempurature gauge light came on. I check the coolant level again and there was nothing in the...


No, you can't add too much coolant. Rather, it does not hurt anything if you do. Did you add it to the radiator, or to the overflow tank?

Let it cool, then remove the radiator cap, and if needed, add coolant to the radiator. Put the cap back on, and fill the overflow tank to the "full - cold" line. Start it and run it a few minutes and look for leaks. If you find no leaks, drive it for a day or two, then let it cool and check it again. If it is down a lot (without overheating), you have a leak somewhere. If you lose enough coolant, that will make it overheat. However, if it overheats, that can cause loss of coolant, when you stop the car, you will see steam and smell coolant, and often hear it boiling.

If it overheats again, make note of when it happens: driving on the highway, or stop-and-go around town. Overheating on the highway usually indicates a clogged radiator, while in-town overheating usually indicates a bad cooling fan (you don't need the fan above about 30 MPH). A bad fan is usually the fan relay, but it can be the fan thermostat (different from the engine thermostat), or a bad fan motor.

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2 Answers

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1 Answer

Started overheating on short drives.


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2 Answers

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You have a new radiator and thermostat, so your coolant was flushed. Was the radiator "burped" afterward to get rid of air bubbles? If not, that needs to be done first - it would explain virtually every symptom you're seeing.

Jack up the car so that the radiator cap is elevated. With the coolant topped off, start the car and let it run until it's about 3/4 of the way to overheating. Then shut it down and go have a beer. When it cools off enough to safely open the radiator cap, do so, and any air trapped in the system will bleed out.

What you're doing is circulating the coolant and the air bubbles inside. The bubbles get lodged behind the thermostat and stay there, keeping it from opening (this causes the car to heat up). When you later pop the cap off the radiator, the pressure is vented from the system, the thermostat opens, and the bubbles pass through. They'll work their way to the radiator (since you've got it elevated) and pop out the open cap opening.

Your coolant level will likely drop somewhat after doing this, as the air bubbles will be gone and the space they took up in the system is now available. You may need to add a little more coolant, so top if off (with the car back on the ground) and recap the radiator, fill the overflow to the marked point on the tank, and you're good to go.

Try this if you haven't already, and post back up with your results. If it doesn't solve the problems, we'll take it further.

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