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 2001 Nissan Maxima problems
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).
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.