Abstract: Methods, systems, apparatus, and articles of manufacture to monitor heat exchangers and associated reservoirs are disclosed. An example apparatus includes programmable circuitry to detect, based on outputs of a sensor associated with a first reservoir, a coolant level of the first reservoir, the first reservoir removably coupled to a second reservoir, the first reservoir to supply coolant to the second reservoir, predict, based on the coolant level, a characteristic associated with operation of a cooling device fluidly coupled to the second reservoir, and cause an output to be presented at a user device based on the predicted characteristic.