Question about 2001 Nissan Xterra

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Overheating Hi , I just bought a 2001 xterra and everything was fine til today. The service engine soon light came on and now the engine is overheating . It overheats faster when I turn the a/c on (not sure if relevent but thought i'd mention) . The previous owner had a o2 sensor replaced (probably not the original nissan part) . I checked the rad , liquide and everything looks fine. I don't think the engine service soon would light up if it was the rad or the thermostat??? Anyways hope someone can help before I take it to deal. thx

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  • giodog2000 May 22, 2009

    Where is the thermostat located on the 2001 xterra 3.3l? I just bought this truck so I don't know much about it yet. BTW , the fans are working ....

  • giodog2000 May 22, 2009

    thanks for your help ,,, I'll have it scanned for the code then I,ll clean the rad , flush liquide , then change my thrmostat. Do I need to clamp the hose when I pull out the thermostat?

  • giodog2000 May 22, 2009

    Thanks a million and I will let you know how it went ....

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Here are a couple of suggestions.

1. Check to see if the electric cooling fans are working properly. Let the car idle until the engine gets hot. Watch to see if the dual fans ever kick in. If the fans never turn on then the problem could be the fans themselves, the fan relay, a fuse, or a temperature sensor.


2. Your thermostat may be stuck closed.


3. When the service engine light is on you can take the car to most auto parts stores and they will pull the codes for you for free. This could help to identify where the problem is.

Running the AC will make the car overheat faster because it loads the engine down. If you driving somewhere and you think you might be overheating and you can't stop to let the car cool down you can roll down the windows and turn on the heater. The heater works by pulling heat out of the engine and moving it to the passenger compartment. It may be uncomfortable but it can temporarily prevent your engine from overheating. This technique is especially useful if you're driving through a desert like in the southwest.

Posted on May 22, 2009

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The service engine soon light will come on if there is an emission system failure. the two problems may or may not be related your best bet is to have the computer scanned to find out why that light is on first and fix that issue and see if the temp issue goes away. the overheating could be something as simple as a thermostat. to read the computer you can either buy an obd 2 scan tool or take it to any auto parts shop they will usually scan it for free for you. before you go to the dealer i would replace your thermostat to rule that out on the temp just for the fact that they do go bad often and is under $20 lots less than they will charge to even look at it for you.

Posted on May 22, 2009

  • jon fuller May 22, 2009

    if you follow the upper radiator hose to the engine the thermostat is in the housing where it bolts to the engine

  • jon fuller May 22, 2009

    no you do not need to clamp the hose but you will lose some fluid if you are planning on changing the antifreeze anyway do this while it is draining you will not have as big of a mess.

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