Automotive Diagnostics, Torque & Trailer Wiring

Why should an automotive automatic transmission fluid level check be conducted with the engine warm and running in Park/Neutral?

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 Correct IncorrectTransmission fluid expands significantly when hot, and the torque converter must be actively pressurized by the pump to avoid a false overfilled reading.

Why should an automotive automatic transmission fluid level check be conducted with the engine warm and running in Park/Neutral?

• Automatic transmission fluid expands thermally with heat, and the torque converter must be charged with fluid by the running pump
• To keep the exhaust pipes warm
• So the headlights remain illuminated
• To burn off excess transmission fluid