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How do I change the thermostat on a Mazda 3 2005

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Change it by removing the housing (where to top radiator hose connects to the engine block) , Replace the gasket and the housing, tighten all the hose clamps you took off and it should be fixed.

Posted on Aug 06, 2010

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Posted on Jan 02, 2017

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Are you sure you have purged all the air out of the cooling system? That would be the most common issue.

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follow the big coolant pipe coming out of radiator and where it joins at the engine.
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How to change a thermostat in mazda protege 2003


2_28_2012_3_28_55_am.gifThe lower radiator hose follow it to the engine block You woll remove 2 bolt 12mm or 14mm. there you pull out the thermostat. when you install you need a new thermostat gasket.The thermostat has a air bleeder nipple that has to be up. When you fill the radiator and you start the vehicle the thermostat will open up when it is warmed and coolant will sink down there you fill the radiator up always keeping you eye on the temperature gauge. Also fill the resovoir.2_28_2012_3_34_36_am.gif

Feb 28, 2012 | 2003 Mazda Protege

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1998 Mazda 323 Protege - constantly overheating, even after fairly short runs (10 minutes). Coolant overflow bottle turns from green to dark grey each trip and almost "explodes".


Possible cause ;
1. Water pump
2. Thermostat
3. Bad head gasket.
4. Low coolant level.
Try to replace thermostat first , this way you illuminate thermostat and coolant level , you'll have to ad coolant after replacement and purge system.

May 03, 2010 | 1998 Mazda Protege

1 Answer

1998 mazda millenium 2.3 supercharged. thermostat location , replaced radiator, car is still over heating, want to change thermostat


follow your lower radiator hose to the engine. where it connects is a flange, remove that flange to access the thermostat

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All i can think of is the thermostat is not opening. or you may have a clog somewhere preventing the flow. Check the T-stat and hoses and radiator ( for clogs) Good luck

Apr 25, 2009 | 1990 Mazda 323

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THERMOSTAT ON 2002 mAZDA pROTEGEE


I would always replace the gasket when changing a thermostat. Old gaskets usually get damaged during removal and they're cheap anyway.

Oct 16, 2008 | 2002 Mazda Protege

1 Answer

Mazda mx5 1990


The thermostats on Mazdas are notorious for kicking out and causing the fans to either not initiate or go on without effective results. My Protege went through 3 before I got my Miata, and I learned how to change the thermostat when it went out the first time. Hopefully, there won't be a second time, but whenever the car overheats and I notice the fans don't come one, I always assume it's the thermostat, and that's always the cause. If you don't want to fix it yourself, take it to a dealer, they're very accustomed to changing thermostats in Mazdas, believe me.

Aug 27, 2008 | 1999 Mazda MX-5 Miata

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Changing the thermostat.


remove the air intake that is on top of the radiator with a 10mm socket then the large hose that goes to the engine is where the thermostat is housed. Unscrew those two bolts which are 12mm and pull out the old thermostat and rubber o ring gasket. Make sure you put the gasket on the new thermostat good and line it up then reverse the last steps til its back together

Aug 18, 2008 | 2002 Mazda Protege

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