Volkswagen passat 2003 has a little heat when it is warm out . no heat when cold out. 2003 volkswagen passat.

SOURCE: 2004 volkswagen passat v6 no heat

Do you notice that the engine coolant temperature gauge stays on the lower part of the scale as well? If so, it's likely that your thermostat is stuck open - this prevents the coolant from staying in the block long enough to absorb heat that is used to heat the climate-controlled air. I'm not positive on the 3.0 in your car, but the 2.8 V6 in my Audi A4 requires tremendous disassembly in order to change the thermostat. I believe the 3.0 is the same - the labor involved is only slightly less than that required to do a timing belt change (which, if you change the thermostat, since you're already all the way in there, you may as well do the t-belt service as well so you don't have to pay for all that labor again any sooner than necessary).

SOURCE: 2003 Volkswagen passat sedan gls where the fuse on

THE MAIN FUSE RELAY BOX IS AT THE LEFT END OF THE INSTRUMENT PANEL BEHIND THE END COVER.YOU ALSO HAVE FUSE RELAY PANEL LOCATED UNDER THE SOUND INSULATOR AT THE LEFT END OF THE INSTRUMENT PANEL.

SOURCE: Location of fuse box on 2003 volkswagen passat

Fuse panel is located behind trim panel on far left side of dashboard....Thanks

SOURCE: On a Volkswagen Passat 2003 V6 with P0441 code

po441 is generally a code for 02 sensors

SOURCE: Free 2003 Volkswagen Passat W8 4 Motion Fuse Box

Can someone help, I have an 03 passat w8 for about a yr