...engine shows overheat on gauge. New thermostat, waterpump, radiator, and cap. After ten miles or so and coming to a stop it shows to be overheating. The heater blows cold and the cooling fans running with cool air coming off the new radiator. Is this the Mazda characteristic of a blown head gasket?
No
blown head gaskets will boil very quickly
I would be checking the temp SENDER unit for the temp gauge as it may be faulty and making the gauge read wrong
run the fault codes to check for coolant SENSOR for a possible fault as well
SOURCE: 97' Mazda 626 6cyl Overheating.
While you have it at the radiator repair shop, have them flow test the radiator. They should have information on the flow of a new radiator and then you can compare the two. They should be able to tell you if your flow rate is high enough to do the job.
SOURCE: 98 Mazda 626 overheating. Blew off hose and was
Yes, this is most likely a thermostat problem.
As a basic explanation, the thermostat is the device which separates the hot coolant in the engine block from the cool coolant in your radiator. If it gets stuck closed, your radiator coolant will remain at near room temperature, while the coolant in your block (which is what your gauge reads) does not circulate and will skyrocket in temperature.
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SOURCE: I have a 1999 Mazda 626 2.0L that is having a
Physically look in the radiator under the cap for coolant level, and check the valve in the cap for sticking. If air is present in the radiator it can't get out, and more coolant can't get in,(from the overflow). Either clean the cap or replace it and check that it is the CORRECT cap.
Radiator fins dirty, clean with a strong stream of water, not high pressure water.
Radiator clogged, have it boiled out, or replace.
Thermostat stuck open or shut, replace it.
Water pump worn out, can no longer move enough coolant, replace it.
Fan shroud broken or missing....
Electric Fan(s) not working, Check the fan, relay, fuse and engine temperature sensor's.
Belt driven fan, belt slipping, fan clutch is bad, fan blades have flattened out.
Air dam under front bumper is gone, loose, or broken. It actually has a purpose other than scraping on the driveway or curbs. It forces air up into and thru the condenser and radiator. If it
SOURCE: 1996 mazda 626 overheats after shur off and sometimes driving. no smoke
sounds like a restricted radiator.. the thermostat has 2 x jobs to maintain the temperature and to restrict the flow-so by removing the thermostat you actually went backwards- meaning the coolant will flow to fast thru the radiator and will not have time to be cooled down prior to returning to the engine block. since your heater helps to cool it down my guess(educated) would be a restricted radiator..
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