Our A/C & Heater Duct Cleaner (part #17900) cleans and deodorizes automotive air conditioning systems, including the vents, ducts, evaporator core, and drain pan. It effectively eliminates odors caused by mold, mildew, stale air and smoke while providing a clean, fresh scent.
There is no real good answer here, as they come in multiple colors. In most cases they are black, but they can be grey, blue or red. Some service port caps are marked with an “H” or an “L” to distinguish between the high and low ports.
Vent temperature will vary based on ambient temperature and heat load on the vehicle. The warmer and sunnier it is outside, the harder your vehicle’s A/C system has to work to make cool air. Generally speaking, in a properly operating system, your vent air temperature should be 20°–40°F cooler than the outside air temperature.