2003 Honda Civic Heater Not Working Properly

Discussion in 'Civic' started by mikebuckle, Jan 2, 2007.

  1. mikebuckle

    mikebuckle Guest

    The heater in my 2003 Honda Civic only heats up after continuous
    driving for 15+ minutes. Additionally, even after highway driving for
    2+ hours, the heater sometimes blows cold air when I slow down and do
    city driving.

    Any ideas?
    mikebuckle, Jan 2, 2007
  2. mikebuckle

    jim beam Guest

    when did you last check the coolant level in the radiator? it needs to
    be full to the top. the expansion bottle needs to be to the "max" mark too.
    jim beam, Jan 2, 2007
  3. Well, to the "max" mark when fully warm. That's why it's an 'expansion
    bottle.' ;-)

    Michael Pardee, Jan 2, 2007
  4. mikebuckle

    jim beam Guest

    no, it needs to be at "max" when cold. that line is less than half way
    down the bottle. the /rest/ of the bottle is for expansion.

    do you keep your oil at the bottom line or the top?
    jim beam, Jan 2, 2007
  5. mikebuckle

    Tegger Guest

    Most likely the coolant level is very low in the radiator.

    As others have pointed out, check this first. Driving with low coolant
    level will damage the engine.

    DO NOT rely on the reservoir level as a judge of coolant level! Check it in
    the rad once the engine is cold. It should be right up to the bottom of the
    rad cap; that rad cap should be dripping wet.
    Tegger, Jan 2, 2007
  6. My sister had that in her Prelude. It turned out to be a stuck open

    Bruce Chastain, Jan 2, 2007
  7. mikebuckle

    mikebuckle Guest

    Coolant level in expansion bottle is at max when cold. I already
    checked that. Oil level is between the top and bottom lines. Oil has
    been completely changed since the problem was first encountered and no

    I’m beginning to think its an electrical problem or possibly the
    mikebuckle, Jan 2, 2007
  8. mikebuckle

    Tegger Guest

    Then it's the thermostat.
    Tegger, Jan 4, 2007
Ask a Question

Want to reply to this thread or ask your own question?

You'll need to choose a username for the site, which only take a couple of moments (here). After that, you can post your question and our members will help you out.