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Re: 1992 9000 temperature fluctuation
Posted by BobS (more from BobS) on Sun, 14 Jan 2007 12:59:03
In Reply to: 1992 9000 thermostat or not???, Jason, Sun, 14 Jan 2007 11:17:31
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If the temp is getting into the normal range in cool - cold weather the thermostat must be closing or the temperature would not reach normal. What you are seeing is a sudden influx of cold water from the radiator. At idle very little water is entering the radiator so the radiator is cold. When you acclerate this cold water enters the engine causing a sudden drop in temperature. If the temp gauge stays low most of the time you may have a thermostat issue. To check, start with the engine cold, idle the engine while feeling the upper radiator hose. The hose should stay cold and maybe warm some until the temp reaches normal. When the thermostat opens the hose will hot quickly. If the hose warms up slowly with engine temperature the thermostat is suspect.
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