Question about 2003 Honda Civic

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HVAC will not stay

On my 03 Si, my heating/AC unit will not stay on. Sometimes it comes on for about 10 seconds and it shut itself off. It doesn't matter if it's on heat or AC, it shuts off. Once in a blue moon, it will stay on the whole way where I needed to go.

I don't think it's the fuse but could it be the relay? or resistor? where do I find the location on these (relay & resistor)?

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  • Evokin Jun 28, 2008

    Thanks HoftHome, I'll check it this weekend. Thanks for the response, I almost given up.

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Check the fan's resistor (behind the glove box) and its connections to the fan and power source! You can easily do this yourself.

My 03 Civic LX (sedan) was doing the same thing ~6 mos. ago (no fan, a/c wasn't clicking on/off, nuthin). The dealer SWORE (almost with his job) that it was one or both of the 2 control boards in the dash (one has 3 potentiometers aka variable resistors, the other has 3 on/off contact switches) and would cost ~$200 each.

It turns out that both were good, and the culprit was the fan's resistor (~$60) had burnt up. I would first check the fan and its resistor for a loose connection before bringing it to a mechanic.

Open the glove box, remove 2 pins on either side of the glove box, then let it hang fully open. On my sedan I had to remove the a/c filter box to get to the fan.

Good luck!

Posted on Jun 27, 2008

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