Remove both hoses from engine that passes through firewall to heater. put a stiff piece of wire in the hole and make sure it is clear. If there is no restriction, then the heater is choked up
SOURCE: 2003 NISSAN SENTRA HEATER BLOWING AMBIENT AIR.
let the engine get cold, and remove the radiator cap, fill the system to proper level and re test. run engine until thermostat opens, fans come on, then alow to cool again and re check engine coolant. If this does not work, or the thermostat does not open the thermostat is instaled backwards, remove and reposition.
SOURCE: 2003 Nissan sentra 2003 gxe, had 4 yrs, no
Start the car up when it is cold and rev the engine up for 30 seconds,loosen up the radiator cap and see if there is pressure there..If there is you probably have a bad head gasket...Caution do not open cap if engine is warm...
SOURCE: 2003 nissan sentra gx 1.8
either the heater core needs a good flush or their is a tap/valve just inside the car up under the dash normally drivers side ,and the cable has come off the lever or it could have a electric solonoid to open the valve ?' depends on where it was built and for what market as some vehicles do have small variations
SOURCE: I have a 2002 Nissan
you may have a problem with heater box. your air/mix door may have an issue. feel the knobs on the control unit. if the cold/heat know feels kinda funny from the other knobs, then thare is a problem with heater box/cables??
Might try a reverse flush of the cooling system. Might reverse flush the heater core too.
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