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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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My Mazda Tribute 2001 was overheating. So I changed the water pump, then changed the thermostat. Fan comes on fine when the car is overheating so that's not an issue. Why is the car still overheating?

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Where is the thermostat in Mazda bravo b2600 petrol I only need located as I need to change it my car is petrol only please

It's inside the thermostat housing... where the upper radiator hose connects to the engine.

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Water in mazda 626 won't circulate.

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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How to replace the thermostat of a 2004 Mazda 3

follow the big coolant pipe coming out of radiator and where it joins at the engine.
its joint with thermostat.
few bolt undo and change thermostat.
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1 Answer

We bought a mazda atenza import from japan we want to know when to replace the thermostat

There's no certain timeline to change thermostat,usually since they are cheap and easy to install,change it when antifreeze is changed.People usually wait till problems occur before replacing.I change mine every 3 years.

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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

Aug 28, 2009 | 1998 Mazda Millenia

2 Answers

Engine overheating

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

1 Answer


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

2 Answers

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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