Either your fans aren't working or the thermostat is stuck closed.
It will idle as low as 600 rpm.It will idle as low as 600 rpm.
yes hot or cold it affects idle speed
Your car can only create cold air if the engine is running to make the coolant work correctly. If your car is idle, your engine is still hot but your engine isn't running so the air you are receiving is actually air heated by the engine.
Hot at an idle, 15-20 psi.
No, as long as the engine is not running hot it will not bother the transmission.
1,000 to 2000 depending on condition of engine
Stalling at idle? Immediately after starting? While driving? While stopping? Cold or hot engine? What engine do you have?
The oil pressure will depend on the condition of the engine. If you have 10 lbs at idle when engine is hot with this mileage, you are within specs. I would use 10W-30 oil. oil pressure of 10lbs and up is acceptable at hot idle. i like to use havoline 30wt oil. have never had a problem with it.
When the car is at idle, the air conditioner works just as hard as when the car is moving. When the car moves, the engine gets very hot. so the air conditioning works better when your at idle because it doesn't have to cool the heat from the engine.
You should have at least 20 lbs. of oil pressure when hot at idle, and 10 lbs. per 1000 rpm when cruising.
I'm going to guess yo have the air on, that would mean that the idle compensator is out of adjustment and over revving the engine.
Your idle control valve may cause this.It is located under the front of throttle body.It is a thermostatic control device.Water passes through and heats up thermostat and closes air passage and idles engine down.You can touch the ICV when engine is hot and it should also be hot since hot water flows through it.Sometimes a flow restriction may be the promblem, if it is not hot when engine is hot you have a flow promblem. this unit can be removed and cleaned. It also can be adjusted internally by turning a spanner nut, the more you run the nut in it slows down cold idle speed.....