The 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.
1. Drain cooling system and remove lower radiator hose from thermostat housing.
2. Remove bolts and thermostat housing
3. Remove thermostat.
4. Reverse procedure to install new thermostat
5. Fill and bleed cooling system
NOTE: When installing thermostat, align jiggle pin in thermostat to notch in thermostat housing (at the 1 O'clock position).
SOURCE: 2001 Mazda Protege cooling fan or thermostat
I am realizing that the cooling fan in this car is very important. It has two in case you didn't notice. The driver side fan motor is bad in mine and the only result is poor air conditioner performance in stop and go traffic. It's fine at high speeds. I would think the thermostat is likely the culprit in your case, but if the fans are not working at all, you should get those replaced. The motors may be bad in both, which could definitely cause overheating. I've been researching prices and you should be able to get the parts for less than $100 each and installation is just a couple of bolts on each assembly.
SOURCE: Blown main fuse on 2003 mazda protege 5.
There are two bolts on the side of the fuse itself. Under the fuse box on each side. Unbolt those and it will come out.
SOURCE: mazda 2003 protege overheating is this most likely
That's a good (and cheaper) place to start.
You might also check belts (water pump at least) for cracking and glazing; the circulation rate doesn't have a lot of latitude and a slipping belt can have an influence.
Also, is your electric fan running when it should?
Also, once you are under the hood, check your oil for any signs of Jergens lotion (water/coolant contamination) and your overflow bottle for any signs of oil floating in it.
If you are going to get your hands dirty anyhow, you might pull your plugs and look for any suspicious rusty discoloration.
This paragraph is assuming bad stuff; namely a failing head gasket which can also cause overheating if it has failed between a cylinder and the water jacket; during combustion, hot gases are pumped into the coolant which also should cause bubbles that you can see in the overflow bottle.
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