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The thermostat is probably stuck open, even when the engine is cold.

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Q: Why does the temp gauge read low when the motor is warm and the thermostat is open?
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Can a stuck thermostat cause a temp gauge not to work?

yes if the thermostat is stuck open the gauge will read low the water or antifreeze will flow straight through the engine and radiater if it is stuck closed it will over heat your car


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The 190 deg F. thermostat will give you an idle temperature in that area of 190 - 195 Deg as will be read from a scan tool. Your temperature gauge on the truck however should read at 210 for normal .... slightly higher when going up long hills under load. The Gauge has will read lower at normal operating temps if your thermostat is in the stuck open position and the thermostat must be replaced as these trucks do not get good mileage unless they are at 190 deg. For Canadians It should be at 100 deg C. Again I must say that all the gauges are controlled by the PCM and display the reading as dictated by the PCM. The PCM gives them incremental information based on complex algorythms developed at GM that give you BASIC information and is not degree accurate. The closest gauge is your Speedometer ....as you know that that would have a negative effecr on your wallet if it was the local Police had you on radar.


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What should the temperature gauge on a 2002 Chevy blazer read for normal operating temp?

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What causes a 2004 trailblazer gas gauge to read overfull?

Some gas gauges read overfull when you fill the gas tank because the needle goes past the full mark on the gauge. A bad sending unit,bad level sender, or stepping motor may be the cause of the gas gauge not working properly.


What is the normal running temperature for a 1994 Camaro V6?

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