2004 to 2020 Mazda 3 Forum and Mazdaspeed 3 Forums banner


  1. Thermostat Housing Leak?

    2004-2009 Mazda3 How-To Guides
    I noticed evidence of a leak during an oil change today. Dabbed it with my finger and, as I suspected, confirmed it is coolant. Went topside for a look and traced the wetness to the thermostat housing. The area is cramped and difficult to photograph. It appears the wetness is forming on the...
  2. Coolant Dripping From Thermostat Housing

    2010-2013 Mazda 3 Engine and Performance
    2012 Mazda 3 Skyactiv. I recently noticed a coolant smell and found coolant dripping from the bottom of the thermostat housing. I had replaced the thermostat about a year and a half ago but this drop just started recently. I replaced the thermostat housing this weekend but the drip is still...
  3. Cooling System Puzzler

    2004-2009 Mazda3 Discussion
    Hello all, I just bought a 2008 mazda 3 i Touring with 124,000 miles on it. I just started noticing that my temperature gauge will begin to climb in steady intervals past the half-way point. If I blast the heat I can get it to drop back down to normal operating temperatures. The strange thing...
  4. 04' mazda 3 thermostat

    2004-2009 Mazda3 Discussion
    so i went to my mechanic amd he told me i dont have a thermostat under the and my a/c compressor clutch is not kicking in therefore, i have no cold a/c. my question: is it really important to have the thermostat imstalled or does it not matter. and will not having it cause my compressor to not...
  5. Faulty thermostat

    2004-2009 Mazda 3 Performance & Mods
    This may be old news, but I have a 2008 M3 with an NA 2.0. Found that Mazda has chronic problems with thermostats. I don't know the criteria to initiate a recall but this should be one! $62 for the new thermostat + housing (Plastic) beats the heck out of $2K rebuild. Never mind two weekends...