Question about Mazda Protege
My mazda protege5 is overheating the temp gauge goes up and down while driving
OUCH, no year.? what country, it is the WWW, right, im clueless.
you have air below the thermostat , the gauge, does not work right with air . Water then air then water then air. oops?
the air is caused by, 3 things.
1: bad service (bad flush and fill)
2: bad engine. (say bad head gasket or far worse)
3: total cooling system failure and overheat and you turned the engine cooling to steam , called boil over. did you?
if you boil it over and keep driving, say goodbye to the engine.
sorry of all this is boring, or OLD HAT, truly but other will like it.
as always, the first question is the engine, overheating.
yes, then fix that first , find the cause.
In pure physics (and ASE classes,) you learn that
it can be 2 things. (or both , weak cooling plus excess heat nets boil)
1: a bad cooling system (yes, the rad cap fell off is one)
2: engine producing too much heat, (EFI ECU in limphome does that on many years of car, worse in USA pre 96 year)
(or bad engine in some way)
This limp mode cause gross spark retardation and huge heat is
blasted in to the water jackets. (ASE 101)
the cooling system is complex , lots of parts.
really no part is excess or useless.
one guy said, a loose rad cap, well gee dont you thing the huge green flood on the garage floor is a clue?
all parts are important.
I have in fact, seen every failure. 1 by 1.
the top failure is engine is ok (no cracked head /block or bad head gaskets) easy and common.:
1: clogged rad tubes. use an IR Pyro gun ($15) to find this so very easy, ask.
2: bad water pump, seen impellers. rusted to nothing or by electrolysis.
3:A bad thermostat , or put in upside down or the jiggle pin bleed hole not up hill , making air burping out ,very hard.
now there are some cars, that have even more odd problems.
i had car (friends) that had a 1.8L and reverse flow RAD.
and the pump is mounted, external to the engine block. odd.
it turned out the hose to the cab heater was blocked
and this hose returns water to below the thermostat.
this blockage made the thermstat go quite nuts. (yoyo effect)
some cars and engine have some real nasty tricks,
to find those harder problems try a real mazda forum. (best practice)
there are other failures and tools to find them, i will not elaborate.
1: the green/blue test, its a tool that finds exhuast gases entering the cooling loop.
2: the RAD LEAK DOWN TOOL, finds cracked block/head or
even early signs of bad headgasket failure or fully bad.
Posted on Oct 15, 2013
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Posted on Jan 02, 2017
SOURCE: 96 honda civic lxi overheating.
The car is not overheating if the temp gauge goes up and down by turning the lights on and off. The gauge is giving you bad information. You can confirm this by starting the car from cold, sitting in the driveway, let the temp go to somewhere BEFORE normal operating temp, then turn on headlights and fan blower on high, watch the gauge, then turn them off. If the gauge moves significantly from the electrical load, you probably have a short or a bad ground connection.
You have a short circuit or bad wiring somewhere in the front half of the car. I don't know what thermostat switch you have replaced ... but it's not the problem .. stop buying them.
If you are the original owner, was there an accident that may have damaged some wiring? If you bought the car second hand, get a carfax and find out where the thing was hit ... concentrate your wiring trouble shooting in that area.
I think it is something OTHER than the temperature sending unit or the gauge
Posted on Oct 29, 2008
I am not an expert on Mazda vehicles but sounds like your fan temperature sensor is not working properly. My fan comes on low speed when the temp hits 205 and goes to high speed at 220 or when the air conditioning is on. You had better get it checked by your dealer or service tech.
Posted on Aug 03, 2009
First, check the relay for the cooling fans. Not sure about Mazdas but Fords have two coolant temperature sensors. One for the gauge or light on the dash and one for the fan relay. Check and make sure the sensor hasn't went bad or come unplugged. If these don't fix it the fan itself may be bad.
Posted on Sep 11, 2009
Tips for a great answer:
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For car running hot and overheating issues, I suggest to you go
through this help links. Click this link below and go through the
troubleshooting procedure to take care of the problems: ----
temp gauge goes erratic?
Temperature gauge keeps fluctuating up and
down close to red?
Car runs hot? http://howtobyme.blogspot.com/2011/11/car-runs-hot-in-traffic.html
-----------All types of car overheating problems and troubleshooting?
Car freeze overnight and started overheating while driving?http://technoanswers.blogspot.com/2012/01/car-freeze-overnight-and-started.html-----------Engine Overheats and heater blowing cold?
Car overheats and Air blows hot at idle?
----------Car engine Overheats and transmission starts slipping?http://schematicsdiagram.blogspot.com/2011/12/car-engine-overheats-and-transmission.html
Temperature gauge does not move and no heat
when heater is ON?
This details will help.Thanks.
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