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2011 xterra with 140k on 'er. I noticed heating issues with the HVAC system (blowing cold when idle) and that the engine was running a warmer than usual, especially during a long drive (~4 hours each way) over the weekend. It wasn't close to overheating or anything, just a bit hotter than usual.

Coolant flush has been on my to-do list and I suspected a possible air leak, or in a worse case a thermometer or water pump issue. Then I popped a P0171 lean code this morning and I'm wondering to what extent they might be related or if it's just a coincidence.

Are these related? If so, is it more likely a warmer engine will then cause a lean condition or more likely that running lean from some other issue will make the engine run hotter? The internet seems torn on whether a lean engine runs hot... I guess worst scenario the engine ran too hot and I blew a head gasket?
 

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1) you are low on coolant. You have every sign of it.
2) lean code should not have anything to do with being low on coolant.
 
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