fluctuating temp gauge - Great Lakes XJ

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ChevelleSSLS6

LIFETIME MEMBER

Status: Offline

Posts: 1579

Date: Nov 17, 2007

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So, my 96 XJ almost has 200k original miles on it, and I noticed that once it warms up the temp gauge goes from ~220 and drops to ~180 and slowly rises to 220, then fairly quickly drops again. This happens in town, at 45mph, 55mph, and 60mph. I'm thinking a coolant flush and new t-stat is in order. Any other ideas, or have you had a similar problem but it turned out to be something else? Thanks! -Matt __________________ My Fleet 1996 XJ "Snowball"- 3.5" lift, bunch of little mods. I hate pegleg rear axles! 1974 AMC Javelin "Jade Grenade"- 360v8, 4sp, green inside and out. Underfunded Project. 2009 Kawsaki Vulan 900 "Rocket III"- Summer DD

dstaub

Supporting Member

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Posts: 523

Date: Nov 17, 2007

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i know this is probably a given, but check your fluid level first. very low levels can cause "air pockets" in the system and cause the gauge to fluctuate sometimes. if not that, then probably it's just the thermostat..... could be a sensor though too i guess.

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