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Old 02-19-2014, 09:41 PM
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temperature gauge fluctuation

My temperature gauge used to stay right at 210 degrees. It now fluctuates from a little over to little below that. I also had an issue last summer where it overheated once. This issue has become more pronounced since then. Should I change the thermostat or is there something else to look for? It's a 4.0.

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Old 02-19-2014, 09:52 PM   #2
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coolant level is good? proper mixture and not too much water?

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Old 02-19-2014, 09:57 PM   #3
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Maybe the wax pellet in the t stat isn't functioning right. I'd say a new t stat might help as it opening and closing affects temps going up and down. Water cools better than antifreeze so I doubt mix is an issue. If you replace it I'd get a Stant and avoid fail safe thermostats like the plague.
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Old 02-19-2014, 10:06 PM   #4
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[QUOTE=Majnoon;8413001]Water cools better than antifreeze so I doubt mix is an issue.QUOTE]

It also heats up faster than antifreeze, and does not protect the cooling system from corrosion or rust!
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Old 02-19-2014, 10:13 PM   #5
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Water pump or thermostat might be going bad.
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Old 02-19-2014, 10:17 PM
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Maybe I'll attempt a coolant flush and thermostat replacement this weekend. Doesn't look like a hard job. I'll do some research on the water pump replacement just in case!
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Old 02-19-2014, 10:25 PM   #7
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I agree about corrosion protection and antifreeze
Is a good thing helping to raise boiling points and lower freezing points. It is not however causing this guys problem. No feasible way. It over cools and under cools due to lack of coolant? Maybe over heat if fluid was low not go below normal. Same with an improper ratio you would have either to much water and it be frozen or to much antifreeze which if it transferred heat as well as water they wouldn't use strictly water in race engines and the motor would have no water as adding it to the antifreeze would be stupid. Antifreeze does not transfer heat better than water.

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