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Thermostat Replacement : The Easy Way


Synesthesia
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Originally posted by microlost

 

this is a write up about changing Thermostat on the S model, i read other post, i don't see any on the S model with pictures, so i took some pictures while i am doing it. and it's not that difficult like they said in the book, should take less than an hour.

 

ok here is how it begin first you should put something under the car to catch the water,then you need to remove the coolan reservoir, (the plastic bottle sitting above the fan) there are 3 screws holding it

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next disconnect the 2 hoses one on the left side and one below

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after the reservoir is out of the way, then remove the a/c fan, first disconnect the power to the fan, the connector is on the right side of the fan, there are two screws there, one above the connector and one below the connector, and the last screw is at the top left of the fan

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once the fan is out, you can see the big water hose connect between the engine and the radiator at the engine side of the hose, there are 2 bolts there, take them out and then you can pull the hose downward and the thermostat should drop out.

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the factory thermostat has a seal on it, the one i buy from Autozone doesn't come with the seal, but if you go to NAPA auto parts, it is the same price ($10) but comes with the seal, Autozone is not a good place to buy parts for S model.

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put the new thermostat in upside down, i put it in the wrong way and i had to do it all over again, i got a failsafe thermostat from Autozone then i put the seal from the NAPA one, or you can just go to NAPA and buy the seal for $4

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and put the fan back and connect the power back, put reservoir back reconnect the hoses and don't forget to add coolan. start the car and let it warm up and check for leaks. like i said, it should take less than an hour.

 

 

This is great! I think it should go directly into the Technical guides subforum :clap:

 

I guess it can be used for the 2,5 as well, part from some of the dismantling, easier access on that one. Isn't it? Never done it on my Xedos. Eventually I will though, a thermostat replacement after say 160000 km or 8-10 years is cheap preventive maintenance.

 

 

i am not sure on the 2.5L engine, i think the location is different, yeh, it's a lot easier to work on the 2.5L engine and easier to find the correct parts,too.

 

 

Uh, that ain't the easy way! The easy way is to get that bitch up on a lift or get on your back. Remove the lower radiator hose from the t-stat housing (or just straight unbolt the hosuing). Let it all drain and just unbolt the t-stat housing. I've done it. Much easier than doing everything you did! :P

 

 

Backwards thermostat effectively blocks coolant flow making the engine overheat. Factory Mazda thermostat is the way to go and is fairly cheap. I bought one of those AutoZone thermostats and decided not to install it because it looked so cheap compared to the original.

 

 

The thermostat on the 2.5 doesnt go in that way... it goes in the other way. If you try to put an OEM, which i think i have, the same way the tutorial says to put it in on the 2.5 it will not let the housing close properly.

 

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