I have the same problem.. my 95 grand Cherokee ltd v8 5.2 just happened the other day. i was told it might be either the oil pressure sending unit? or the rear main seal which i disbelieve.
The 2009 Jeep Grand-Cherokee has a V6 engine.
The 2012 Jeep Grand-Cherokee has a V6 engine.
The 2013 Jeep Grand-Cherokee has a V6 engine.
The 2007 Jeep Grand-Cherokee has a V6 engine.
It's the same engine in both.
It is not supposed to be on when engine is running unless there is a problem.
an engine is hottest after you turn it off. The humming is the cooling fan automaticly running to cool your engine down for longer engine life.
The temp of my Jeep Grand Cherokee seems to run between 210 to 220 degree whether I am on the freeway or city driving.
The 2014 Jeep Cherokee has an inline 4 engine.
this is probably being caused by the emissions system. The light is coming on when the vehicle is going into what is called closed loop.
The 2009 Jeep Grand-Cherokee has a V6 engine.
The 2012 Jeep Grand-Cherokee has a V6 engine.
The 2013 Jeep Grand-Cherokee has a V6 engine.
The 2010 Jeep Grand-Cherokee has a V6 engine.
The 2007 Jeep Grand-Cherokee has a V6 engine.
The 2014 Jeep Grand-Cherokee has a V6 engine.
The 2006 Jeep Grand-Cherokee has a V6 engine.