Question about 2000 Nissan Maxima

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2000 maxima overheating

130,000 miles. No leaks, new radiator, new thermostat. Runs cool at idle, fans come on. Under load the temp needle climbs right to the top of the "normal range". Once hot, under light load low RPMs, the temp fluctuates a lot. Could this be a pump problem? Is the pump in this car on the timing chain?

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  • pilotpat Sep 25, 2008

    1997 Maxima. Overheated w/ac running this summer. Turned off ac turned on heater. Temp came down. Sporadic overheating since. Temp gauge will go normal (about 7/16 to halfway). Drive for a while temp will climb when I slow down from highway to street. Will run above normal, climb fall in the middle third of gauge. If I stop and restart in succession it will stay high for the rest of the trip. Let it cool down overnight or so and it will start same process all over. Ambient temperature does not seem to affect this cycle. Changed Thermo and antifreeze, no change. Overflow is full and no aparent leaks. I do not suspect pump or head gaskets since power is good and no unexplaned useage.



  • paytonplace Jan 13, 2009

    same problem. . . Someone said it may be an air pocket also so he tried to get the air pockets out. It was still running hot, so he took the thermostat out completely. It is still running hot occasionally and it is driving me insane bc no one can seem to fix it. I am assuming that the air pocket is sitll in there so I am going to try this one more time.

  • jawt Mar 11, 2009

    I've had the same problem in my wife's 2000 maxima. I think I have most of the air out now. Every time I would remove the cap after it cooled down the air would be released into the overflow tank. This morning was the 1st time I opened the cap and it didn't bubble up in the overflow. However, I have noticed the fluid level in the overflow tank is getting higher and higher, now it's way past the max level. Thought it was supposed to pull it back into radiator when cool? Also, now there is white smoke at start up only, and heater does not consistently blow hot, even when car is fully warmed up (or overheating!).

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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.

Posted on Aug 11, 2008

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My 2000 nissan maxima is over heating i replaced the thermostat and its still doing it in can anyone thats knows about cars email me please this is driving me insane leethompson729@gmail.com thanks alot

Posted on Oct 09, 2012

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Ok, to review, it got hot climbing a mountain, and stayed cool going down the same mountain ?
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