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The radiator fan is probably not working. The fan is controlled by a temp switch, located on the intake manifold, just below the thermostat housing. murf427
Thermostats fail in 2 ways: (a) sticking open (b) stick closed
Your seems to be sticking open - and so the engine warms up VERY slowly,
but still throws a little heat out the vents - less heat over time so that
your daughter didn't even notice the gradual decrease over time.
If you can replace the thermostat on your own, your cost may be less than $5.
To get a new thermostat (always buy parts on your own - the garage will charge a
50% surcharge on any parts they have to locate for your car), try Wal-mart first
(they sell a few thermostats for a few cars), then any auto parts place.
Replacing a thermostat in a 1998 Fiesta ZTEC engine should be the first thing
a DIY mechanic learns after figuring out how to do regular maintenance items - since
stuff like distributor cap/ distributor rotor/ thermostat are actually regular maintanance
items - destined to have a limited life span, like any moving part.
The check engine light is operating correctly as the computer reads a spike in temperature range in the engine. Your problem is more than likely a bad thermostat. I have seen times when a bad or loose radiator cap would cause the same symptoms. If the radiator cap has been removed recently it could be that it is just not on correctly. Make sure you check this only when your engine is cold. Hope this helps you out
Thermostat not opening up, A thermostat is spring loaded and it will open up at the spec temp for what the thermostat calls for. Are you losing water, feel the hose to see if it is actually hot as the gauge states.
Thermostat will need to be replaced. I recommend draining a quart of anitfreeze by loosening the petcock on bottom of radiator. Then re-tightening. Then follow upper radiator hose, it will lead right to thermostat housing. It should have about 3 screws/bolts on it to remove. The thermostat is underneath.
U are talking about two different sending units, one is the Engine Coolant Temp sensor, the other is the temp guage sender, sounds like you have a bad thermostat, if the engine doesn't reach the proper operating temp it will set a code for the engine coolant temp sensor, and the guage will not move or move very little, replace your thermostat and both problems will go away.
Check for an OBII code. have it scanned for free at an autoparts store. it is not the thermostat since you have already replaced it 3 times.Check for the temperature control sensor during scanning..
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