Question about 2001 Nissan Xterra
When u say runs hot what is the temp? 230-240 is ok for modern engines, they are designed to run this hot under severe conditions like where u live without any damage to the engine, I also live in a semi desert area and have learned that many people are bothered by the fact the guage seems to read high, there are a few thing to check, if the truck has an air dam under the front bumper to divert air is it intact? not damaged? also if you are really overheating then you can have another radiator built with more cooling capacity, also if you had the ac repaired or charged it may have been overcharged this can add 10 or 15 degrees to the operating temp, make sure the coolant is a 50/50 mix, I have seen all these types of things cause hot running with AC on in my dealer, with 40 years in the field have seen most all types of overheating problems, also want to mention that there are many posts about this truck running hot with ac on so the bigger radiator might be the ultimate fix...
Posted on Jul 28, 2009
I certainly understand the EXTREME driving condition you are subjecated to. Some vehicles seem to take it better than others.I believe it mainly boils down to the ability of the vehicle to move air basically. Hopefully the foam seals which run around the perimeter of the condenser to the radiator are present and are in tact during the replacement procedure on the radiator.Even little things like that can make a difference and allow more air through the coils of the condenser and radiator.Im a bit concerned about the radiator and am hopefull it was a new OEM radiator from Nissan.I've had horrible luck with anything but.The rows for coolant travel inside the radiator are so minute and intricate,its not possible to re-man or opt for aftermarket on this unit.a couple of inactive rows in that aluminum radiator could be detrimental.I would not rule this out even though you have a "new radiator" unless it was an OEM part. One thought, there is a product from a company called Red-Line that makes a coolant additive called "water wetter" . This with water will run 30 degrees cooler than antifreeze.It does not have freeze protection but it has amazing heat transfer qualities.This product has actually been around quite a while and this their best selling product.I would also verify A/C pressures and insure the high pressure side is within specs.A slightly overcharged system will develop higher head pressures which equals super-heat across the condenser coils. Too much freon in the desert is not a good thing. I would also try to verify the actual operating temps you are running as the temp gauge might be inaccurate.I would check for discriminating values from the engine control temp sensor.You might have gauge reading higher than it is.The ECU will cut A/C compressor in an overheat situation.Im curious if the computer has ever interrupted A/C while driving? This is a true sign of overheating when the computer cuts A/C operation.Lastly,I have installed aftermarket cooling fans on the outside of condensers before and have them come on with the compressor. Installed them to push air into the condenser and have some success with that.Installing an aftermarket electric fan may be helpfull in your situation. Intrested in your thoughts and findings...good luck
Posted on Jul 28, 2009
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Posted on Jan 02, 2017
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