The thermostat is located in the thermostat housing at the engine side end of the upper radiator hose. You have to drain the engine coolant from the radiator until it is below the level of where the thermostat is. Make sure you don't spill any coolant, or you clean it up if you do. Antifreeze tastes sweet. Dogs, cats and other animals are very attracted to it. It is fatal when they drink it. For us, too. 2.3L engine: You should remove the charge air duct, air filter housing and resonator. Then take off the two thermostat housing bolts, open the housing and pull the thermostat. 2.5L engine: remove the hose mounting bolt and separate the pipe from the outlet housing. You'll find an O-ring between the hose and the housing. You need to replace that one with a new one. Remember to buy one before you start. The engine harness bracket bolt now has to be taken off, then put the wire harness out of the way. Take off the housing bolt, remove the housing cover, the thermostat as well as the gasket (remember to buy a new one before you start). Before you put in the new thermostat, make sure the surfaces of both parts of the thermostat housing are very clean. On putting in the new thermostat, the side where the spring is must point towards the engine; jiggle pin must face in the direction of the radiator. Some models have a tab on the thermostat that fits into a notch at the housing. 2.5L engine: Use a new gasket. Its projection should point in the flow direction of the radiator. Put the housing cover back. Apply the lower bolt first, but don't tighten it yet. Fix the engine harness bracket, but leave the bolt loose. Now tighten both bolts to 14-19 ft.lbs. Put the new O-ring between the pipe and the housing. To avoid damage to the 0-ring, make it wet with some coolant. Tighten the hose mounting bolt to 14-19 ft.lbs. 2.3L engine: Close the housing-thermostat assembly and tighten both bolts to 14-18 ft.lbs. Put back the resonator, air filter housing and charge air duct. 2.5L & 2.3L engine: Fill cooling system. Apply answer to "How do you bleed the coolant for a 1998 Mazda Millenia." This will prevent bad and costly surprises of an incompletely filled cooling system. Make sure there are no leaks.
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AnswerAT the engine end of the upper rad hose.on a millenia, the thermostat is inside the flange on the engine side of the LOWER hose. look under the coolant resevoir. see the lower hose? follow it to the engine. where it connects, that is the cover for the thermostat.
Hi there - I just found out yesterday that the thermostat on the 1995 Millenia - 6 valve engine is located on the right/front of the engine block just behind the distributor. Looks like fun. NOT. Good luck!
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open da hood. see the coolant resevoir? under that is the lower radiator hose. follow it to where it goes into the engine, and under that flange is the thermostat
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in da tank
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It's attached to the back of the intake manifold, under the bracket that supports the wiring harness.
I am getting ready to replace the EGR valve on my 1995 Mazda millenia. It is located at the back of the engine in the center at the top. It bolts on with 3 bolts. It will be a triangle shape. You will have to have a mirror to see it well. Any auto parts store should be able to show you exactly where it is.
Under the thermostat housing
I have a 1995 millenia. I don't the difference but i removed the pattern underneath the glovebox and it was in the lower right corner. It has a plug running into it and it is held by 3 screws. 10 minute job to replace.
It should be within the water outlet which is attached to the lower end of the top radiator hose. Mark If the 96 millennia has a 2.3 engine, the thermostat is in the bottom radiator hose at the housing on the block.
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