Temp gauge bouncing what gives? - Nissan Frontier Forum
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#1 (permalink) Old 09-01-2007, 08:11 PM
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Temp gauge bouncing what gives?

On my lovely trip across Kansas today my temp gauge started bouncing any ideas?
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#2 (permalink) Old 09-01-2007, 08:36 PM
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What were you driving?

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#3 (permalink) Old 09-01-2007, 09:28 PM
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Have you done anything to the coolant recently?

Air in the coolant system?

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#4 (permalink) Old 09-01-2007, 11:55 PM
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it's an 01 cc s/c fronty. when I checked it out after it started bouncing, the coolant was only lukewarm. So it's not over heating the question is, will it hurt anything?
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#5 (permalink) Old 09-01-2007, 11:58 PM
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sounds like your radiator might be stopped up... or your water pump is not working properly... just two guesses...

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#6 (permalink) Old 09-02-2007, 12:01 AM
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but it's not running hot thats the puzzling part....my thought is that the thermostat failed and is open

and what will it hurt to drive it like that like i did for 150 miles today?

Last edited by zukicreations; 09-02-2007 at 12:37 AM. Reason: Automerged Doublepost
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#7 (permalink) Old 09-02-2007, 12:55 AM
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Can you describe bouncing? Is it slowly moving up and down like the engine is heating and cooling quickly? If so check the thermostat. Is it going to around normal, then dropping quickly then going back to around normal? if so check the sending unit connection, or the power line going to the gauge. Is it quickly ( like under a second) from top to bottom? If so you may need to check the wire going from the engine all the way to the gauge. The coolant gauge works by providing power to the gauge, then the temp is read by the sending unit adjusting the ground to give you a reading. If that wire is frayed, it could ground out, taking it to a full reading almost immediately. Good luck, Electrical problems are a beast to pinpoint.

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#8 (permalink) Old 09-02-2007, 01:03 AM
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From what else I have found it is the t-stat. So I will be replacing that. It will show normal to on or below C in 3-5 second intervalls. So I guess that needs replaced. Great thing to do on the road, good thing we have friends local. Thank God for friends.
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#9 (permalink) Old 09-03-2007, 01:09 AM
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sounds like maybe a loose connection? the wire could be losing signal or just the sensor bad.

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#10 (permalink) Old 09-05-2007, 12:07 PM
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I don't think it's the t-stat, unless it's been replaced lately. More than likely it's the sending unit or a wiring problem. I'd start w/the connection. Clean and grease it.

Run it 'till it breaks and fix it faster!
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