Question about 2000 Nissan Maxima
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?
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
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 firstname.lastname@example.org thanks alot
Posted on Oct 09, 2012
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Posted on Jan 02, 2017
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