Cooling fan may not be working as it should. If it is not coming on either the fan is defective, fuse is blown, or the thermal sensor is bad. If it is running and the engine is still overheating the radiator may be partially clogged.
There are many reasons why your car might vibrate while it is idling. It could be running too hard for example.
I presume the engine is running when the car is parked if the temperature guage does not move to the normal position when the car is moving at road speed but goes up when the car is stopped and the engine idling, then more than likely the thermostat is bad and needs to be replaced. If you se that the temperature guage is in the normal position anafter the car has been running a while and the temperature guage then goes down when the car is moving at road speed, then this confirms that the thermosta is bad.
The fan should turn on whenever the engine temperature reaches a certain point. If the fan does NOT come on, the cooling system is not able to dissipate the excess heat. Yes, it can cause the engine to overheat.
Yes, when the fan stops and the compressor keeps running it is in defrost mode. You should also be running auxilliary heat while this is happening.
It is the idling sensor on top of the intake
It can be normal for a person to get wet, or perspire while running. It is normal for someone to also sweat more than someone else while doing the same activity.
I'd be suspicious of the thermostat.
I know that on my 1998 Silverado, if I but the parking brake on, the fulltime headlites turn off while I'm sitting and idling.
Sounds like you idle sincere is bad try replacing it and see what happens.
Because while running the cells start to respire rapidly which increases the metabolic activities and hence the temperature of the body rises.
Effectively all the fuel that it burns while idling. You are getting 0 miles per gallon while idling.
There are several things that can cause your Jeep to stall while idling. The timing may be off or your fuel filter may be clogged.