Stop in for a cup of coffee
Has a viscoushious? fan on the pump and a electric one for the ac.
Mechanical fans are more efficient than electric ones...
But with the A/C on you need some extra air flow, that's why they put the electric fan in also...
I worked in climate control for 3 years and participated in some of the testing... They do alot of testing on the "cooling package" (radiator and condensor with fans, shrouds, and seals)...
Part of the testing is to pull 5000 pound trailers through Death Valley with the A/C cranked... Death Valley is so hard on cooling systems they have signs posted there to turn off your A/C so your engine doesn't overheat... Our testing was to put them through worst case, so they pulled max trailer loads with the A/C cranked to be sure that the engines did not overheat and the customer can remain comfortable with the A/C on...
Another test that they do is to park the car/truck with the front end one foot from a wall at the Arizona proving grounds and let it idle for 30 minutes or more... This makes sure that the fan, shroud, and front end seals do their job to make sure the air goes through the radiator and condensor and not around it... It's more severe than idling in traffic at a stop light... You don't get the ram air through the front end like when the car is moving and is the most severe test for idling...
People don't realize how much testing they do to make sure everything works properly...
However if someone modifies the parts from stock, and it overheats, they won't warranty it.... Like if someone puts an aftermarket grille on the car or truck and it overheats, they are on their own... If their aftermarket grill has more air restriction, then it can overheat easier... People don't think of that when they customize their cars... One of the challenges is to have enough opening in the grille to get more airflow through the condensor and radiator...
That's why they reduced the number of openings on the Grand Cherokee around 94 - 95... The old grille had 8 openings and the 'new and improved" grille had 7 openings, but they were a little larger.... That increased the front end airflow by 10% which helped lower the high side pressure through the A/C system....
They also changed the condensor tubes from round to star shaped... The star shaped tube had more surface area, which gave it more ability to transfer heat better...
