Question about 2004 Mazda RX-8

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2004 Mazda RX8 Heater problem

I have a 2004 Mazda RX8 and am having problems with my heater. In the summer the AC works fine, but sometimes I notice that when I am driving it will start blowing hot air (notice it when I begin to stop quickly), then I will turn the climate control knob towards hot and back to cold and then it will blow cold again. But during the winter it won't blow anything but cold air. Have any idea what might be the problem? Thank you.

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There is a well known problem that is a manufacturer's defect with the soldered connection on the circuit board behind the temperature knob. There is a fix to re-solder the connections but the dealer will gladly take $450 to replace it with the same bad board that will last you a while. Look for the link to show you how to fix it yourself.

Posted on Dec 19, 2009

  • Darek Gulich Nov 13, 2013

    Not sure if you have gotten this fixed yet but I figure if you have then maybe someone else will bennefit from this like I did. I had the same problems that you are describing and instead of paying $250+ for a repair follow these instructions from the RX8 CLUB. First turn your car on turn on the radio and hold the on/off button while holding that, press and hold seek (up) from a minute, you should see it say a/c temp with a number. It should read 16 if your heat is all the way up. If not turn the knob all the way over to cold and turn the knob until it reaches 16. Keep it in that position to get heat and turn it to 0 for a/c. Hope this helps you or anyone else having this problem. If it doesn't click and follow the instructions for the link below. Hope this helpshttp://www.rx8club.com/series-i-do-yours...

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Not sure if you have gotten this fixed yet but I figure if you have then maybe someone else will bennefit from this like I did. I had the same problems that you are describing and instead of paying $250+ for a repair follow these instructions from the RX8 CLUB. First turn your car on turn on the radio and hold the on/off button while holding that, press and hold seek (up) from a minute, you should see it say a/c temp with a number. It should read 16 if your heat is all the way up. If not turn the knob all the way over to cold and turn the knob until it reaches 16. Keep it in that position to get heat and turn it to 0 for a/c. Hope this helps you or anyone else having this problem. If it doesn't click and follow the instructions for the link below. Hope this helps. Your numbers may be scued like mine it says 00000(13)(13)(13)(15)(15)(16)(0) and so on. You have to get it reset. Looking for a solution to reset it now. But at the very least you should have heat.

http://www.rx8club.com/series-i-do-yourself-forum-73/diy-no-heat-repair-heater-control-158200/

Posted on Nov 13, 2013

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Take it to the dealer, this is a manufacterer defect

Posted on Dec 21, 2009

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Hey all, found a do-it-yourself guide to fix this problem. I plan on doing it, then sending Mazda a bill for the labor at standard shop rates. :-)
http://www.rx8club.com/do-yourself-forum-73/diy-no-heat-repair-heater-control-158200/

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