positive-the primary form of an adjective or adverb; denotes a quality without qualification, comparison, or relation to increase or diminution. positive degree. adjective-a word that expresses an attribute of something. adverb-a word that modifies something other than a noun.
It's summer. It's stinking hot. And for any silly person who leaves their pets (or any imbecile who leaves their kids) inside a parked car, watch this video where a doctor traps himself inside a parked car to see how how it gets. Even with all four windows cracked down a bit, the car temperature reaches 117 degrees in only 30 minutes. And no. Even if you leave your pet inside for just five minutes, the temperature already spikes and becomes miserable.
The engine drives a compressor (sometimes just called a pump) that sucks this refrigerant gas in the pipe from the evaporator (that's the heat-exchanger next to the heater under the dashboard) and compresses it to quite a high pressure. This pressure can vary a lot but typically in summer would be around 250 psi. Gas compressed this much heats up considerably. This hot, high-pressure gas leaving the compressor is piped to the front of the car where it is connected to a radiator capable of containing these high pressures.