The AC system may blow warm air due to refrigerant loss caused by a leaking low pressure AC hose. These hoses commonly develop a leak at the hose crimp connection.
Problems for specific Nissan Maxima years:
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Most reported 2004 Nissan Maxima problems
The external seal on the engine oil cooler can fail and create an oil leak.
The thermostat may become stuck closed, causing an overheating condition. Replacement of the thermostat will be required to correct this concern.
The engine mount on the right side can wear prematurely and cause excessive engine movement.
Service Engine light came on. Took it to Auto-Zone initially. The diagnostic tool pointed to the EGR valve. I then took the car to a Nissan dealership who advised me it was indeed the EGR valve "stuck in the open position" along with a bad bank 1 convertor. Now, according to the dealership the engine is burning oil. Time for a second opinion.