Fan-Assisted Heat Exchanger. Rather than relying upon radiant heat per se, these systems work by creating a cycle of convection. A temperature-controlled switch regulates an electric fan that blows air over a heat exchanger, circulating warm air. The warm air rises and cold air is drawn into the heat exchange where it is heated, etc. A Basic Definition. PWM stands for pulse width modulation. PWM fans and/or pumps are found in some CPU coolers and GPU (aka graphics card) coolers. They use an integrated circuit to control the As engines become smaller, more efficient and operate at higher temperatures, cooling systems have had to evolved to meet these challenging demands.Make sure Check hose manifolds on the compressor. Check the front seal and the o-rings sealing the pressure switches on the back of some compressors. Check where the hoses are crimped onto the fittings. Check the Schrader Valves.Check for pin holes in the condenser. Check where the evaporator drains condensation with UV light. Simply put, there is a direct correlation between the air temperature and the rate the water will evaporate. Temperatures over 110 will lead to small water droplets evaporating in under a second. If the temperature is in the 80s, misting fans loose so much of their cooling ability they normally aren’t even used. The turning of the clutch fan speeds up the car, forcing a high air volume to pass through the radiator. The airflow cools down the spring, so it shrinks and disengages. It slows down the cooling fan, making it turn at 20% of the water pump’s speed. This process gets repeated in a cycle to maintain the correct engine temperature. In contrast, passive or fanless cooling systems offer a quieter, more reliable, and versatile solution. Aspect. Active Cooling. Passive Cooling. Noise Level. Can be noisy, especially under heavy load. Offers quieter operation, ideal for noise-sensitive environments. Sealing Possibility. Requires airflow and can't be fully sealed. So: 1) Its ok, but neednt cut in immediate also. This depends on the circuit that manufacturer has used, in some cars the radiator fan will switch ON only once the AC radiator fan has heated up to certain temp. Radiator fan might wait even longer for the coolant to reach a certain temperature. A better arrangement for controlling the fan on an air-conditioned vehicle is shown in Fig. 3. A pressure switch that closes on increasing high-side a/c pressure will run the fan. At highway speeds, when there’s sufficient airflow over the condenser and radiator, the switch stays open and the fan doesn’t run. Radiator (heating) Heat exchange by built-in bathroom radiator uses hot water flow through the stainless steel pipes seen here to raise the temperature of the ambient air. The radiator depicted here also serves as a towel rack and warmer. Radiators and convectors are heat exchangers designed to transfer thermal energy from one medium to another zPpy.