Question about 2003 Mazda Protege

1 Answer

Temp gauge reading high

My wife noticed the high temp and turned the heater on. This lowered the temp immediately. I checked it out and there is no fluid loss in either the radiator or reservoir. The fans were running when I checked. My guess is the thermostat but I would like to check the sensing unit and fan relay. Is there an electrical reading I should see at either place?
Mazda Protege LX 2003

Posted by on

  • NurseHimes Jan 02, 2009

    was this the thermostat this happened to me on Christmas eve have not been able to get help with yet



1 Answer

  • Level 1:

    An expert who has achieved level 1.


    An expert that has over 10 points.


    An expert whose answer got voted for 2 times.

    Problem Solver:

    An expert who has answered 5 questions.

  • Contributor
  • 16 Answers

If the fans are running and there's no blockage in the system, my first guess would be the thermostat too.

Look HERE for a link to a couple of circuit diagrams. Good luck.

Posted on Nov 22, 2008


1 Suggested Answer

  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi there,
Save hours of searching online or wasting money on unnecessary repairs by talking to a 6YA Expert who can help you resolve this issue over the phone in a minute or two.

Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.

Here's a link to this great service

Good luck!

Posted on Jan 02, 2017


Add Your Answer

Uploading: 0%


Complete. Click "Add" to insert your video. Add



Related Questions:

1 Answer

What happens when thermostats dont work in chevy tahoe 2000

The temp gauge will read lower than normal especially at highway speed. The check engine light may come on with a P0134 code (I think). And there will be a noticeable loss of heater from the heater, if you live in colder climates.

If you track fuel economy you will also notice a noticeable reduction in fuel economy depending on how cool the engine gets.

I’m happy to assist further over the phone at

Feb 18, 2015 | Cars & Trucks

1 Answer

2004 Impala ls temperature dash gauge

fans came late on those car,like 212 and second fan comes on at 224,you reprogram it to come a lot sooner,,other thing is there might be gunk inside the block,and coolant has hard time to pass through,and staying longer than enough in block temp goes high,even tough the radiator is doing it's job,it is just coming out block lot hotter than it suppose to be,and gauge read the block not the radiator

Apr 18, 2017 | 2004 Chevrolet Impala

1 Answer

Temp gauge goes up and car turn off.makes this steam sound.

Sounds like a waterpump,Car may have a safty shut off ,when over heating,,Turn heater on high /blower too ,this will lower temp.Then get to a gas station asap

May 10, 2012 | 2004 Chrysler Sebring

1 Answer

1998 subaru forester overheating heater blows cold air

Any chance of a head gasket leak? Is the coolant level still full? These were known for head gasket issues. Coolant is a closed system and level will not drop unless there is a leak. Make sure there is no air in the system. Replace the radiator cap to make sure that it is operating properly.

Mar 02, 2017 | 1998 Subaru Forester

1 Answer

2000 Jeep Grand Cherokee with a 4.0L engine... the temperature only rises to about 150 degrees and stops... sometimes lowers a bit even at highway speeds. Normal operating temp is about 210-215 degrees. ...

The thermostat controls the temp of the engine. The temp sensor tells the gauge what temp to display. If the heater is still putting out a lot of heat then it may be a false reading temp gauge. If however the temp is noticibly cooler then replace the thermostat. A stuck open thermostat would also cause the engine to warm up slowly. check for a loose/dirty connection at the plug on the temp sensor.

Nov 24, 2010 | 2000 Jeep Grand Cherokee

1 Answer

Temp gauge is giving false high readings, 260+.


Nov 30, 2017 | 1995 Oldsmobile Cutlass Supreme

1 Answer

Temp gauge often reads too hot, engine normal.

It sounds like your cooling fans are not comming on by themselves, but when you turn on the ac it forces them to turn on. Make sure relay is good, then replace coolant temp sensor, this may have failed no telling pcm to turn on cooling fans. Thanks

Jun 08, 2009 | 2002 GMC Safari

1 Answer

2002 KIA Sedona Overheating

most likely, replace thermostat .

Apr 14, 2009 | 2002 Kia Sedona

Not finding what you are looking for?
2003 Mazda Protege Logo

Related Topics:

319 people viewed this question

Ask a Question

Usually answered in minutes!

Top Mazda Experts


Level 3 Expert

81400 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22326 Answers

Jeffrey Turcotte
Jeffrey Turcotte

Level 3 Expert

8841 Answers

Are you a Mazda Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides