Temperature Gauge reads between half & almost red on hot days running the AC. Fluid levels are fine, new thermostat, replaced dash motors on all dash gauges, newer water pump ( 2 yrs ago), flushed system, replaced temp gauge. Car off gauge goes to lowest point 140, unplugged sensor gauge dropped off too, turn heater on temp starts going to normal. I checked the temp in radiator and it reads 150-170 degrees after a 300 mile ride.Gauge position between half & 3/4. Span is 120 to 260, so is it safe to say it is reading at half 196 -200 degrees? I see fans running at both speeds at times.
Fans came late on those car,like 212 and second fan comes on at 224,you reprogram it to come a lot sooner,,other thing is there might be gunk inside the block,and coolant has hard time to pass through,and staying longer than enough in block temp goes high,even tough the radiator is doing it's job,it is just coming out block lot hotter than it suppose to be,and gauge read the block not the radiator
SOURCE: 2001 mitsubishi eclipe heater does
It could be very well your water pump from the sounds of it. When was the last time you had that check or replaced? That would be my next guess to the problem...what's your mileage on the car?
SOURCE: Dash Temp Gauge reading extremely hot
I had an issue with my 95 taurus and we ended up having to replace the thermometer
SOURCE: temp gauge reads hot when cold
That wire you are unplugging is pinched and being shorted to ground ! You need to trace that wire until you find it . Also if anyone has done any repairs recently you may want to start looking in that area .
SOURCE: The temp gauge says the engine is hot but, in
I'm not certain if this engine has coolant bleeder valves, but if it does, make sure there aren't any pockets, particularly around the sending unit. Something is fooling the computer into thinking that things are really, really hot.
SOURCE: 1999 Oldsmobile Bravada Heating Problem
when engine is cold remove radiator cap and check coolant level,sounds like it is really low and has an air pocket in it.
http://howtobyme.blogspot.in/2012/05/2004-toyota-tundra-oil-gauge-and-temp.html
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http://schematicsdiagram.blogspot.in/2012/04/temperature-gauge-sits-over-half-way.html
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http://technoanswers.blogspot.com/2012/01/heater-blows-intermittently-and-temp.html
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http://technoanswers.blogspot.in/2012/02/no-heat-on-oldsmobile-silhouette.html
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http://technoanswers.blogspot.com/2012/01/temperature-gauge-keeps-fluctuating-up.html
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http://technoanswers.blogspot.in/2012/02/dodge-neon-gauges-not-working.html
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http://schematicsdiagram.blogspot.in/2012/02/heater-blows-cold.html
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passenger side?
http://schematicsdiagram.blogspot.com/2011/12/heat-blows-cold-on-drivers-side-and-hot.html
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Antifreeze out of reservoir and heater Blows Cold Air?
http://whatisbyme.blogspot.in/2012/05/1992-lexus-ls400-engine-overheats.html
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These details will help.
Thanks.
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