Where is the location of the thermostat in Mazda 626?

Answer 1

AnswerTry at the engine end of the upper radiator hose

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You have to remove your air filter box, and it is underneath it. Basically, you will see a metal coolant pipe running from the bottom of the radiator to a junction right next to your intake manifold and there will be 2 bolts holding it on, as well as a bolt holding the coolant pipe to the block. Also, when you replace the thermostat, you have to replace the gasket. I used 2 gaskets, one on the thermostat (the one I took out had a big oring thingy around it, the new one didn't, nor did they hayne's manual mention an oring, so i reused it), and there is one that goes on the thermostat housing. It's like .99 at autozone, and the thermostat is like $10. Make sure you face it the same way too! Otherwise, your car will continue to overheat. Also, you MUST use RTV gasket sealant on the housing gasket (but not on the o-ring gasket, if you have one). And NO, you DO NOT have to remove the intake manifold.

.....[======]..\\........| ....<----rear bank of cylinders

.INTAKE MAN%........| ....<-----% sign is the thermostat

.....------------..[_].......| .....<----airbox

.....[======]..........| .....<----front bank of cylinders

_________________| .....<----front of car

I'm not sure about later models, but my 93 626 thermostat was located on the bottom left of the engine just to the right of lower pulleys