PAUL KRAUSE

riding down the road, when check gage light came on. noticed my temp
gauge was at 260. pulled over and checked under the hood, everything
looked ok. the eng was not running hot, checked for heat and heat was
coming out of the vents my coolant level was where it is suppose to be
and had the coolant replaced about five months ago. does anyone have an
idea to what cause the temp gauge to register hot when the coolant level
was fine and the eng did not run hot. thanks in advance for any info.

Mike Romain

I would suspect the coolant level in the 'radiator' was low due to a
leak.

If leaking, the overflow bottle can be 'normal' but the fluid inside the
rad can be low.

If the thermostat stuck, then the top rad hose should be cool and the
bottom one hot. You can take a cold off engine and open the rad then
let it warm up while watching for fluid flow. Once the engine reached
operating temperature on the gauge, you should have coolant flow in the
rad.

Or the connection on the temperature sender could be dirty or the sensor
could be bad. I am not sure on a 99 if you get a fake hot or cold
reading on the gauge with a bad connection on the sender. I suspect a
false hot, but....

Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's
Canadian Off Road Trips Photos: Non members can still view!
Jan/06 http://www.imagestation.com/album/pi...?id=2115147590
(More Off Road album links at bottom of the view page)



PAUL KRAUSE wrote:
>
> riding down the road, when check gage light came on. noticed my temp
> gauge was at 260. pulled over and checked under the hood, everything
> looked ok. the eng was not running hot, checked for heat and heat was
> coming out of the vents my coolant level was where it is suppose to be
> and had the coolant replaced about five months ago. does anyone have an
> idea to what cause the temp gauge to register hot when the coolant level
> was fine and the eng did not run hot. thanks in advance for any info.

Mike Romain

I would suspect the coolant level in the 'radiator' was low due to a
leak.

If leaking, the overflow bottle can be 'normal' but the fluid inside the
rad can be low.

If the thermostat stuck, then the top rad hose should be cool and the
bottom one hot. You can take a cold off engine and open the rad then
let it warm up while watching for fluid flow. Once the engine reached
operating temperature on the gauge, you should have coolant flow in the
rad.

Or the connection on the temperature sender could be dirty or the sensor
could be bad. I am not sure on a 99 if you get a fake hot or cold
reading on the gauge with a bad connection on the sender. I suspect a
false hot, but....

Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's
Canadian Off Road Trips Photos: Non members can still view!
Jan/06 http://www.imagestation.com/album/pi...?id=2115147590
(More Off Road album links at bottom of the view page)



PAUL KRAUSE wrote:
>
> riding down the road, when check gage light came on. noticed my temp
> gauge was at 260. pulled over and checked under the hood, everything
> looked ok. the eng was not running hot, checked for heat and heat was
> coming out of the vents my coolant level was where it is suppose to be
> and had the coolant replaced about five months ago. does anyone have an
> idea to what cause the temp gauge to register hot when the coolant level
> was fine and the eng did not run hot. thanks in advance for any info.

Mike Romain

I would suspect the coolant level in the 'radiator' was low due to a
leak.

If leaking, the overflow bottle can be 'normal' but the fluid inside the
rad can be low.

If the thermostat stuck, then the top rad hose should be cool and the
bottom one hot. You can take a cold off engine and open the rad then
let it warm up while watching for fluid flow. Once the engine reached
operating temperature on the gauge, you should have coolant flow in the
rad.

Or the connection on the temperature sender could be dirty or the sensor
could be bad. I am not sure on a 99 if you get a fake hot or cold
reading on the gauge with a bad connection on the sender. I suspect a
false hot, but....

Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's
Canadian Off Road Trips Photos: Non members can still view!
Jan/06 http://www.imagestation.com/album/pi...?id=2115147590
(More Off Road album links at bottom of the view page)



PAUL KRAUSE wrote:
>
> riding down the road, when check gage light came on. noticed my temp
> gauge was at 260. pulled over and checked under the hood, everything
> looked ok. the eng was not running hot, checked for heat and heat was
> coming out of the vents my coolant level was where it is suppose to be
> and had the coolant replaced about five months ago. does anyone have an
> idea to what cause the temp gauge to register hot when the coolant level
> was fine and the eng did not run hot. thanks in advance for any info.