Question about 2005 Buick LaCrosse

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Low Engine Temp what causes it? - 2005 Buick LaCrosse

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Wrong antifreeze to water ratio.

Posted on Aug 05, 2010

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Could be a bad thermostat..

Posted on Aug 05, 2010

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Odds are the engine and/or oil pump is wearing out.
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The oil is pumped thru the crank bearings, then up to the top of the cyl heads. The pressure switch is midway up the block.
10w30 oil is made to be used between 0 degrees and 100 degrees. As the temp goes up the oil is supposed to get thicker, but only so much. So as the engine warms up the oil gets thinner and naturally looses some pressure. Thinner oil will "leak" thru worn engine parts.
You may luck out and have the pump replaced and fix the problem, but if it has more than 125,000 miles on the engine, the bearings are probably failing too.

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Not real familiar with your engine, but generally you have two coolant temp sensors. One just runs the dash gauge. the other speaks to the computer and acts sort of like a choke. If the computer thinks the engine temp is hotter or cooler than it actually is, fuel metering will be wrong. The more likely culprit is the low fuel pressure. I have even seen a bad fuel cap cause something like this, as these systems operate under pressure I believe.

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If the thermostat is stuck open, the engine temperature will drop and set a fault code indicating that the engine is not reaching operating temperature. This will cause your check engine light to come on. Have someone scan your engine computer. Most large parts chains will scan for codes at no cost to you. If there is a "Thermostat" or "Engine temp low in closed loop" or a similar code indicating low engine temperature, replace the thermostat.

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