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Old 05-22-2021, 01:51 PM   #4
fdryer
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Join Date: Jan 2006
Location: NYC
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2003 L-Series 3.0L Sedan
Default Re: 2001 Saturn L300 - v6 3.0 Liter - Lower Radiator Hose

Automatic xmisions generate heat so maintaining oil temperatures requires pumping hot oil into a tube within the radiator for coolant to absorb heat. The xmission cooling lines simply flow into a single tube and out of radiators, returning to the xmission. This separate tube is immersed in coolant to provide an even oil temperature, not cold or hot. A fluid transfers cold or heat faster than air. Since xmission oil runs higher than engine coolant, xmission oil temperatures are maintained for optimum operation. In freezing temperatures, xmission oil needs to get up to operating temps so the cooling system provides initial heating until the xmission warms up from driving. The radiator has one or two cooling fans to ensure cooling the ac system, cooling system and xmission oil.
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