Transmission Overheats

WARNING: This page is about a different car, the 2004 GMC Sierra, 2004 GMC Cab & Chassis Sierra, 2004 Chevrolet Silverado, and 2004 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.

Condition	Action
Aerated fluid - incorrect fluid level	Adjust fluid to the proper level. Refer to Transmission Fluid Checking Procedure . Inspect for a defective pump.
Air flow to cooler obstructed	Remove the air flow obstruction.
Engine overheat	Correct the overheating condition. Refer to Symptoms - Engine Cooling in Engine Cooling.
Inaccurate temperature gauge or sending unit	Replace the gauge and/or sending unit.
Inaccurate sump temperature sensor	Replace the pressure switch manifold (PSM) or internal harness. Refer to Pressure Switch Manifold Replacement orWiring Harness Replacement .
Excessive cooler circuit pressure drop	Inspect for plugged cooler, lines too small, collapsed hose, too many elbows in circuit.
Transmission cooler lines reversed	Connect the cooler lines properly. Oil and water should flow in opposite directions.
Fluid cooler lines restricted	Remove restrictions and clean or replace the lines. Refer to Transmission Fluid Cooler Hose/Pipe Replacement .
Torque converter - wrong converter, no torque converter clutch, stuck stator, or slipping stator	Replace or repair the converter assembly. Refer to Torque Converter Replacement . A stuck stator will not allow cool down in Neutral.
Cooler flow loss due to internal transmission leakage	Overhaul the transmission.