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Temp jumping back to red, then back to normal?

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Old 06-10-2011, 03:14 PM
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Year: 1997
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Default Temp jumping back to red, then back to normal?

1997 Jeep Cherokee.

Anyways, I was on my way back from the bank on a hot Florida day. Temp gauge read ~215 which is pretty normal. Stopped at a red light to wait for the green arrow to turn left and BAM! Warning light comes on and I get beeped at and suddenly im at 250. I made a quick u turn and went to go park it and let it cool down while I got something to eat.

As im going down the aisle to pull into a parking space the gauge jumps back to ~210 and the warning light goes off.

What gives? Thermostat is brand new and I have plenty of coolant. My dad thought the wsater pump could be going bad or is cracked or something, and I do sometimes get a noticeable coolant smell. It has done this once before.

Thanks.
Old 06-10-2011, 07:21 PM
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have you bleed the air out of the cooling system after you replaced the thermo?
Old 06-10-2011, 08:14 PM
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How old are the other cooling system components?
Old 06-10-2011, 08:18 PM
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sound like bad sensor,or plugs loose to it
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