Operation

OPERATION

On all models equipped with an automatic transmission, the transmission oil is routed through the air-to-oil transmission oil cooler where heat is removed from the transmission oil before returning to the transmission. The air-to-oil cooler has an internal thermostat that controls oil flow through the cooler. When the transmission oil is cold (less then operating temperature), the oil is routed through the cooler bypass. When the transmission oil reaches operating temperatures and above, the thermostat closes off the bypass allowing the oil to flow through the cooler. The thermostat is serviceable.

On heavy duty diesel engine models, the transmission oil is routed through an oil-to water transmission oil cooler first, then to the air-to-oil transmission oil cooler.