Having problems with your 2002 Nissan Altima ?
I have a 2002 Nissan Altima. The heat no longer works, it blows out cold air. The heat will only slightly work when I drive on the highway.
Usually it's a bad thermostat or a blocked heater core. The best way to fix it is to have it flushed out. But make sure when it's done, either by you or your shop of choice, they disconnect all the hoses and do the heater core, motor and rad seperately. Also put in a new thermostat. Another problem in certain vehicles with low use is that the air direction flaps in the dash are stuck. Start the car, and move the dials. you should hear the flaps/doors moving. (They are vacuum controlled, so thats why you start the car). I hope this helps.
Repair Help & Product Troubleshooting for 2002 Nissan Altima
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