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 Nissan Maxima problems
The external seal on the engine oil cooler can fail and create an oil leak.
The Check Engine Light may illuminate indicating a primary ignition signal fault. Many times the cause is an ignition coil(s) that has failed. The problem in the coil causes the spark energy to feedback through the wiring harness into the other coils. If this is not repaired, it can damage the other coils (blistering on the coils may be seen).
The fuel injectors can develop leaks on some models, causing the engine to run poorly or to become less fuel efficient.
The crankshaft position sensor can fail causing the engine to run poorly or it may crank but fail to start.
If the power steering pump develops leaks, it can drip onto the lower control arm bushing causing the bushing to deteriorate. A knocking noise will be heard when driving over bumps and it may become more difficult to control the vehicle.
The idle speed control motor may fail and possibly damage the engine's engine control unit.
Failure of the vehicle's speed sensor can cause speedometer and the cruise control to become inoperative. A failed speed sensor will require replacement.