2000 dodge caravan go about 6 miles temperature gauge maxes out

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Old 07-24-18, 10:48 AM
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2000 dodge caravan go about 6 miles temperature gauge maxes out

2000 dodge caravan go about 6 miles temperature gauge maxes out, of slow down to about 50mph or stop for 1 minute it will go back to normal and will be fine the rest of the day. It does this every morning!! What is happening? What needs replacing?
 
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Old 07-24-18, 11:52 AM
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could be bad or sticking thermostat thats slow to open when engine reaches operating temperature.
 
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Old 07-24-18, 12:33 PM
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Second the thermostat suggestion.
 
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Old 07-24-18, 01:50 PM
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Other ideas?

Raditator cap? Might replace this first. Thermostat governs minimum temp, not the max, and when failing usually stays open, and car does not warm up properly?

Does the radiator fan go on, maybe the fan temp sensor is not actuating the fan at the right temp?

Outlier issue, might be a head gasket leak, that seals up as the car warms up?
 
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Old 07-24-18, 05:34 PM
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Well, t-stat has a small bypass hole allowing some coolant flow before it opens.... So it sorta looks like there is no by flow or t-stat lags to pen.
Then again, knowing Dodge engines(now that I have a RAM) it may be bad gasket leaking hot exhaust into coolant before stat opens, warming it up too fast.
I'd check coolant in expansion canister for being clear. And, possibly run exhaust test on coolant, on radiator.
 
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