Question about 1991 GMC K1500
My temp gauge always reads very high close to 260 degrees before it cools down. i changed water pump thermostat coolant temp sensor and radiator. only pegs out when engine is very cool and does it once then the gauge does not seem to go as high had computer hooked to it while it ran and computer only shows 88 to 96 degrees celcius. any ideas what it could be.check engine lite works but does not come on only the check gauges lite comes on when this happens. truck heats good and never blows cool air like a head gasket indicator no antifreeze in oil or other way around. i'm thinking bad wire or bad gauge.
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Posted on Jan 02, 2017
The only real way to answer your questions is for you to open the hood and look it over. Once it has cooled down, re-fill the cooling system (use water...it's cheaper and to do repair you will need to repalce it anyhow...Once full carefully look everything over to find where the leak is.Also make sure that the drivebelt is there. (from what you said, likely it is) If it's water pump, you will see coolant running out from under the pulley. Once you have looked everything over, if you have not found leak, start engine and close the cap...look again...as pressure builds, small leaks will become more obvious. If you don't find leak, remove the thermostat and change it.
After changing stat, if problem persists, it's likely that you have either a plugged radiator or an internal engine gasket problem. If you have any auxiliary electric cooling fans, make sure they are working and also check the fan clutch on the mechanical fan (it should not excessively freewheel when hot). Whole testing, any time you replace the radiator cap you must allow engine to cool down before removing it again. Watch temp gauge while testing...don't allow engine to overheat.
Posted on Apr 03, 2009
there is a sensor in the resivor bottle that malfunctions alot and all engines used in that vehichle make a ticking sound under load that is a rod knock nothing to worry about but to be safe check you fluid level.
Posted on Apr 07, 2009
It sounds like your cooling fans are not comming on by themselves, but when you turn on the ac it forces them to turn on. Make sure relay is good, then replace coolant temp sensor, this may have failed no telling pcm to turn on cooling fans. Thanks
Posted on Jun 08, 2009
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