What would cause the aux fan cycle every 20 seconds or so on a jeep cherokee? low freon? Need help and suggestions......
The aux fan kicks on when, (A) you have the AC on or (B) the engine temp is above 210. Your engine could be teetering up and down around that temp so the fan will kick on, cool the engine back down then turn off once lowered. It heats back up, turns on again then cools down and kicks back off. So on, you get the point.
Happens all the time to me while im wheelin. If its doing it on the freeway or even everyday driving your probably running a little warm. Need a new thermostat or low on coolant or need the radiator flushed. If you get muddy alot make sure the radiator fins are clean.
If your going to "try" and top off your AC you need to evac the entire system and fill it with the proper quantity , ounces. People usually make the biggest and most costly mistake when they "top off" their AC system. Over charging the system can cause the pump to take a ****, blow metal chunks in your system, then you need damn near everything in the AC system. . CHA CHING$$$$$
none of this is true in my situation. the fan goes on every 20 sec or so. the engine temp doesnt even hit 200 before it kicks on