Erratic temp gauge

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RagingPanda
Posts: 862
Joined: Wed Sep 03, 2003 6:39 pm
Car: 78' 280Z

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The car warms up fine and driving is fine. The problem is when I'm on the highway around 55mph+ the temp gauge drops down to cold. Up and down again depending on my throttle input but never above warm. I have enough coolant.

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RagingPanda
Posts: 862
Joined: Wed Sep 03, 2003 6:39 pm
Car: 78' 280Z

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oh crap...I posted it in the wrong section. Should be Nissan not Infinite since it's a 96' 240sx
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qship96
Posts: 6624
Joined: Sun Nov 24, 2002 11:31 am
Car: 1996 Infiniti Q45

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Check and replace thermostat!!!!
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Q45tech
Moderator
Posts: 14296
Joined: Tue Apr 30, 2002 3:19 am
Car: 1990 Q45 342,400 miles 22 years ownership with original engine
1995 G20t 5 speed 334,000 miles 16" 2002 wheels - 205/50/16 Sr20ve vvl

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Check for a dirty corroded senso connector [single wire] with ground return.Why you always use a Scan tool to confirm what ecu is seeing and never trust inside display.
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