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2003 Mazda Protege 5 2.0L overheating

My engine is over heating. I change the radiator, and thermostat. When the vehicle is idling, the engine does not overheat. While idling, the water pump seems to be working as i can see the fluid in the resevior moving. Once I drive the vehicle, it becomes hot. At this time, I do not see the water in the resevior moving. Please advise. Thanks.

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May be the oil pump is not working properly or the water pump is not working

Posted on Oct 26, 2012

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Posted on Jan 02, 2017

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SOURCE: Ford Escape 2003. Engine suddenly overheat.

Engine over heating can be caused by a number of things. When you say the water pump and radiator appear to be ok I am also guessing that you checked the coolant level to make sure it is normal.

If the level is low then you obviously have a leak. Insufficient coolant circulating will not cool the motor properly because it won't be able to draw enough heat out. If the level is normal then you need to check the thermostat to make sure it is opening properly. To do this, run the motor to temperature and check the top and bottom hoses. They should both be hot and firrm once the thermostat opens meaning the circulation loop is operating properly. If the top is hot and firm and the bottom is cold/soft or collapsed then the thermostat isn't opening.

If the thermostat is operating properly then you ned to look for some other obstruction or cause for coolant loss. Check the head/intake gaskets, hose connections, hoses, over flow tank, radiator fins, radiator side tanks etc..

Good luck.

Posted on Jun 10, 2010

Testimonial: "Thank you for your quick response. I will get the head/intake gasket checked."

gordanddar
  • 477 Answers

SOURCE: 1995 Chrysler Cirrus overheating

Probably not water pump. Engine is notourious for vapour lock.
Cooling system must be blead of air before thermostat will work. Cool bottom rad hose is a dead give away. If you are still watching this forum reply , and I will walk you through the only way I know how to make it work properly. It's actually easy if you do it my way. I have worked on lots of cars , and this engine was the hardest to bleed out. Did one Yesterday , and works perfect.

Posted on May 16, 2010

Testimonial: "I need help on how to bleed the system thanks"

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SOURCE: 99 Chevy Silverado is overheating after maintance on radiator

check radiator, could b blocked, check hoses, mayb they soft, while vehicle running c if hoses r compressing, if they r would b iether radiator or hoses

Posted on Mar 12, 2009

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SOURCE: 1990 nissan sentra overheating

it sounds like a water pump not circulating antifreeze properly

Posted on Dec 10, 2008

  • 1 Answer

SOURCE: ford ranger truck overheating

I have had this happen with my ranger. Changed everything I could to try to fix the over heating. It turned out that I had a small leak in my head gasket and it was allowing exsaust gas to go into the cooling system witch was over pressurizing it. Also the air from the exsaust will heat up much faster than liquid making your thermostat to read hot and will not be able to blow hot air in the cab because there is no liquid going to the heater core. This happened to me when my blet came off and I tryed to make it home. If you had it over heat for a long peirod of time it may have ripped the head gasket.

Posted on Feb 21, 2009

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2 Answers

How to change a thermostat in mazda protege 2003


2_28_2012_3_28_55_am.gifThe 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.2_28_2012_3_34_36_am.gif

Feb 28, 2012 | 2003 Mazda Protege

2 Answers

04 x-type no heat, vehicle overheating, I changed thermostat, still no heat, and vehicle still overheating, I have no fluid,lose, fans are operating normally


I had the same problem with my daughters truck. Changed everything finally changed the radiator, that was it.

Nov 13, 2011 | Cars & Trucks

1 Answer

1999 Protege overheating. Changed thermostat, radiator, water pump and burped the new radiator. Runs fine on freeway, but will overheat in stop and go traffic.


if your vehicle has electric cooling fans it could be that they are not working,if this is the case when you are on the freeway you don't need the cooling fans you only need them when the vehicle is not moving as there is no air going through the radiator to keep the engine cool......hope this helps......cheers.

Jul 21, 2011 | 1999 Mazda Protege

1 Answer

Where is the thermostat located on my 2003 Mazda Protege5?


follow the top radiator hose back to the engine,they'll be a half dome with 2 bolts,themostat will be underneath there,the thermostat should come with a new gasket-hope that help,god luck!

Nov 06, 2010 | 2003 Mazda Protege

2 Answers

2003 Protege 5 overheating on long runs (> 20 min). Overheated today while driving at interstate speeds for > 15 min. Lost the coolant. Refilled with coolant. Return drive maintained normal engine...


Sounds like you have coolant leak if you are loosing coolant or a bad thermostat. I would replace the thermostat, they run about $10. The other fan is an aux fan and will only run when the a/c unit is on.

Mar 01, 2010 | 2003 Mazda Protege

2 Answers

2003 Mazda Thermastat


I had the same problem a couple of years ago. It is actually located on the bottom of the engine. I have no clue why. They are usually located on the top for easy access. Follow the hose coming from the bottom of the radiator to the engine block.

Dec 04, 2009 | 2003 Mazda Protege

2 Answers

Mazda overheating only when i drive past 40mph. I just changed my radiator and now I don't know what to do.


check to see if you are getting heat through the heater and then check and test your thermostat, if you require further assistance let me know. if this helps please take the time t rate this siote. and good luck.

Oct 26, 2008 | 2000 Mazda Protege

3 Answers

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.

Oct 18, 2008 | 2001 Mazda Protege

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