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
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Hi Bill, is the engine actually getting hot enough for the fans to come on? if the engine does have overheating problem (but you say the temp gauge reads normal) then i would check the operation of the engine temp switch, there are two, one for the gauge and one for the fans.
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.
Plz check your temperature sending unit that feeds computer (NOT TEMP GAUGE ON INSTRUMENT PANEL). Also, Have checked that engine coolant isnt air bound, which will not allow coolant to circulate properly throughout the engine and cause immediate overheating and safety engine shut-off
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.
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