One problem related to vehicle overheat has been reported for the 2006 Nissan Altima. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2006 Nissan Altima based on all problems reported for the 2006 Altima.
I bought the car in may 2009. Up until June 2013, no problems other than regular maintenance. Car overheats and has been since June 2013 on and off. Have had battery replaced 2 times, tune up, crank shaft sensor replaced, broken seal replaced (that keeps oil/coolant) in car. Have had problems with car not starting, engine turns over but won't start. I have to keep putting anti-freeze in car before I drive it every few days if I don't the heater blows out hot air, then cold which is when overheating occurs. White smoke coming out of exhaust pipe. Been to local mechanic 3 times, and they keep charging to fix it ($500 so far). They did tune up, replace battery and fixe the broken seal. I'm a nervous wreck driving it because I'm afraid I'll get stuck somewhere.