Methods and systems for fluid leak determination

An engine method comprising:

• arranging a vehicle outside of a parking spot at a first position;
• capturing a first image of the parking spot via an image capturing device;
• propelling the vehicle to the parking spot;
• propelling the vehicle outside of the parking to a second position after parking the vehicle;
• capturing a second image of the parking spot;
• and
• identifying a coolant leak based on a comparison of the first and second images.

A system comprising:

• an autonomous vehicle comprising a hybrid engine selectively coupleable to an electric motor;
• and
• a controller with computer-readable instructions stored on non-transitory memory thereof that when executed enable the controller to:
• execute a coolant leak diagnostic in response to a coolant volume decreasing at greater than a threshold rate;
• the coolant leak diagnostic including an internal coolant leak diagnostic and an external coolant leak diagnostic;
• the internal coolant leak diagnostic including intrusively increasing a coolant pump output to a high displacement during a higher engine load and detecting an amount of white in exhaust gas to detect an internal coolant leak;
• the external coolant leak diagnostic including arranging the autonomous vehicle outside of a parking spot, capturing a first image of the parking spot, arranging the vehicle outside of the parking spot following a threshold duration, capturing a second image, and comparing gray scale sums of the first and second images to detect an external coolant leak;
• and
• in the absence of the internal and external coolant leaks, indicating a coolant sensor as degraded.