There will be a sticker somewhere in the engine compartment that tells you how much to add. It is usually 8 oz with no other oil in the system. Be careful to ensure that your system is purged prior to reinserting. I added too much to my truck and now have to have the system purged to get the system balanced out. AC systems work on a very exacting amount of oil to freon ratio. Too much oil of not enough is not good for the system. Too much oil and the freon does not flash from a gas to a liquid properly, not enough oil and the compressor lifespan is shortened.
To lubricate the compressor.
Liquid
I bought a used 2003 Mountaineer in November come to find out that the AC doesn't work. I have added freon but still blows hot air. I bought a rebuilt AC compressor off Ebay and will have it installed soon.
yes
Liquid
Ac leaks are hard to find. there is a chemical that can be added to the Freon. Under a special light it will show up. If it is a small leak it may not show up, especially if its on the compressor behind the clutch.
Down on AC compressor
NO, it does not.
The compressor automatically turns on and raises the pressure as rear axle load increases. The switch found in the rear compartment is for using the compressor for filling tires after attaching the supplied hose.
It is added through the low pressure line when refrigerant is added if it is a new compressor put it in the low pressure side and you may need to push down gently on a check valve inside if equipped. an average amount of oil is 4 ounces but you need to check the manual to be sure, in my case the install instructions referred me to the owners manual which was no help, as was the haynes. I called the parts store and they looked it up for me.
The EGR valve is located in the center of the intake, at the front of the engine, between the alternator and the A/C compressor. I've added a picture of the location under "Links". It is titled "Picture of EGR valve location, on 1996 - 2001 4.3L (262c.i.) Vortec V6 engines"
The original mansion was built in 1711. It was demolished and rebuilt in 1877 and the 'huts' were added during World War II.