There was a recall for a batch of manual-transmission Rangers built between 2015 and 2016 which had a poorly installed clip on the gearshift cable on the production line. Your car is from an earlier batch, but it’s not inconceivable that the problem is the same one.

The cable clip in question could allow the cable that operates the gear changes to make contact with the car’s driveshaft. At that point, gear-changing could become difficult or even impossible, which sounds pretty much like your symptoms. Check with a Ford dealer to see if your vehicle was covered by this recall.

Some Ford Ranger owners have reported that the hoses that carry coolant to the engine’s EGR valve have failed, allowing coolant to escape. This is one of the more common ways for this engine to lose coolant.

The problem with no warning showing up on the dashboard has more to do with physics. The warning light is triggered by the temperature of the coolant it’s submerged in. If the engine loses enough coolant, the sensor is suddenly not contacting the hot water and it ceases to give a reading or, therefore, trigger a warning. This is not a Ford Ranger thing, but a common problem faced by car owners over many decades.

While many car-makers now profess that their automatic transmission no longer need regular fluid changes, many mechanics believe there’s no harm in doing so and, in fact, there are benefits in doing so. They include reduced wear over time and the removal of any contaminants that might cause problems. Also, if a transmission has ever reached high temperatures, the fluid should be replaced.

The thing to know is there are two types of fluid change. In the simplest, the transmission fluid is drained, the filter changed and new fluid added. Inevitably, some of the old fluid will remain in the torque converter and other components. But a more complete approach is what’s called a fluid flush where new fluid is pumped through the entire transmission, purging it of all the old fluid. The full flush method is best practice and shouldn’t cost a lot more.