how to replace a heater core on a 2003 Nissan Altima 2.5
look to the left of the battery for a cord
The heater core is located underneath the dashboard on the passenger side and a lot of the dash components will have to be removed. This is a fairly complicated repair and I recommend getting a book so you know how to do it properly.
how to replace heater fan resistor on Nissan Sentra 2003
there is a relay the needs to be replace in the heater which cost about 50 dollars and you need to take out the glove box and it is easy to replace. takes about 1 hour or less.
you may have a bad thermostat,replace and see.
Under the dash behind the glove box on the passengers side........
there is an electrical panel box in the engine conpartment..take the cover off and read the inside cover and look for heater relay
You pretty much have to remove the entire heater box under the dash on the passenger side
By the clutch pedal two screws and a plug
yes, see toms z31.com
The average cost of labor to replace a heater core will vary from dealer to dealer. The national average is around 105 dollars per hour.