I have a 2002 nissan altima and i am not getting heat

have 2002 altima,blower works no heat at idle and very little heat when accelerating.I changed carbon cabin filter,made sure little gear under dash to temp knob wasnt broken,flushed and bled system.Nothing worked so checked hoses to heater core and found inlet hose was hot,outlet hose was not.So investigated this problem and came to conclusion heater core was clogged.An easy way to check is to get car to normal running temp. put on heater and blowers at full.Go under dash on passenger side where counsel meets firewall,this is where heater core core inlet and outlet aluminum tubbing go through firewall,you will be able to feel both tubes one closest to you is outlet, so if this one is not hot and and other is your heater core is clogged.I detached both inlet and outlet hoses to heater core from water control valve.Then I blasted water with waterhose and nozzle set at jet,first through outlet hose to blow gunk out,then through inlet hose until water runs clear.Reatach hoses fill and bled system.heater works great nice and hot!

The heat doesn't work on any 2002 altimas. Call Nissan and complain!

Your nissan has no such knob.

if your not getting any heat first check that you have coolant in the radiator and its full.

second you may have a problem with the blend door not working right.

any mechanic or a/c shop can help you with this

Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/sean_54c3a3dc48a7773c

most likely you'll have to replace the plastic tab on the back of your controls its easy to do. You'll have to take out the radio and temp. Control unit you'll see where the cable hooks in its probably broke. For a temporary fix you can unhook the cable at the floor. Its on the drivers side by the gas pedal.

i had the same problem with my 02 altima..behind the temp knob was broken and the cable to open and close the heat vent ..was no longer connected...to check turn knob from red to blue a few times and listen for vent door movement...also u can look on left side of console to see if cable is moving.

Replace your radiator.

nissan altima notorious for air pockets in cooling system , bleed system well , make sure cooling system is topped off and retry , cheers .

take to dealership , that also is a recall problem with alot of altimas , they need to flush system and check water valve , got mine fixed working great ever since , never hesitate to ask dealership about recalls , they have to fix for free

Did the switch break because it was stuck? If so, then yes, they will have to change actuators and doors. Does the fan work on all speed setting? If so then you do not need a blower resistor. The resistor pack only controls the current flow to change speeds of the fan.

You need to check and see if the control has vacuum, this is what controls where the air is sent, the switch is called the HVAC mode control selector.