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Bad temp gauge

95EddieBowWow

New Member
Joined
January 26, 2012
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City, State
Los Angeles, CA
Year, Model & Trim Level
'95 Ford Explorer,
Good morning all!
Was recently gifted a 1995 Explorer and it's the best free vehicle I've ever owned. 120k miles, runs well & no major problems. As a jeep fan I think I'm gonna have to stuff my 'Exploder' epithet, as this is a sweet little truck.

First mystery to solve: Swinging Temp Gauge.
What it does: turn key to 'on' and it immediately pegs beyond Hot.
Start it and it wiggles a bit.
Put it in gear and it swings down to the actual temp.
Then it gets bored and pegs again.
As I drive it swings to the actual temp and back to pegged position randomly.
Occasionally it must be setting a code cuz the Check Engine light comes on, but I don't have a code reader, so haven't checked it.

Yesterday I replaced the thermostat and temp sending unit (to the gauge, not to the computer) it has one lead, not two. She runs fine & isn't overheating, but the gauge acts the same as before. Before I run out and buy the second sending unit, are there any words of advice?
 












Which sending unit did you change- did it have one wire or 2 coming out of it?
 






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