1995 Mazda Protege Overheating

MAZDA
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BRENDANROOD
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I have a 95 Mazda Proto with a 1.5 motor, 108K miles. I have been having probles with it overheating on me. I replaced the thermastate. Then I noticed that the ratiator fans were not running so I traced it back to the cooling fan sensor. I replaced the sensor and now the fans run when they should, but I am still overheating. I have heard that the ratiator cap has to hold a presure and if it does not then that can be the problem, is that ture and what else could the problem be?
Thank you
Brendan.......
Jun 2, 2006 at 5:37 AM
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MWHITNEY
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Yes the radiator cap can cause it to over heat.
Dec 12, 2006 at 1:35 AM
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RASMATAZ
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[quote:66c26b1c15="BrendanRood"]I have a 95 Mazda Proto with a 1.5 motor, 108K miles. I have been having probles with it overheating on me. I replaced the thermastate. Then I noticed that the ratiator fans were not running so I traced it back to the cooling fan sensor. I replaced the sensor and now the fans run when they should, but I am still overheating. I have heard that the ratiator cap has to hold a presure and if it does not then that can be the problem, is that ture and what else could the problem be?
Thank you
Brendan.......[/quote:66c26b1c15]


Since you know how to replace a sensor-buy yourself a coolant pressure tester-it will help find your problem or a bloc check. Possibilies: water pump, blowngasket, clogged Rad, collaspe hose, bad stat.

Check your dipstick for milky color and white smoke from the rear of he car.

or disable the ignition ,disconnect your upper hose from the Rad and see whether the pump is working-it should push coolant out.
Dec 12, 2006 at 7:12 PM
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Suggested Repair

Pressure-test the cooling system and radiator cap, and do a block check. Also inspect for a bad water pump, blown head gasket, clogged radiator, collapsed hose, or faulty thermostat. Check the dipstick for a milky appearance and look for white exhaust smoke. With the ignition disabled, disconnect the upper radiator hose and confirm the pump pushes coolant out.

Conversation Summary

The owner of a 1995 Mazda Protege 1.5 with 108,000 miles still has overheating after replacing the thermostat and cooling-fan sensor; the fans now run normally. A reply confirms a radiator cap that cannot hold pressure can cause overheating. The expert recommends a coolant pressure test or block check and lists a water pump, blown head gasket, clogged radiator, collapsed hose, or bad thermostat as possibilities. They also suggest checking for milky oil and white smoke, and verifying coolant flow from the water pump.

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