[mobilemechanic]

ok im back sorry i went in depth on that last reply..ok if you want to convert your truck ,,first i am assuming the pump wich is a r4 pump radial compressor is workin fine , you have a leak in the system ..ok goto the parts store and buy a orifice tube and a dryer miniumum..buy some flush also..then buy the retrokit like the prevoise posting said ..see if the system has gas if it does have shop pump it out ..once the system is relieved of pressure take the line going to the condensor off ..both lines off take the dryer line off both sides and remove the orifice tube out with needle nose pliars..remove the tube check for metal on the orifice screen if there is a bunch the compressor is going out...if no metal good..now you should all the lines disconected except for the compresssor ...dump the flush into one side of the lines and used compressed air and blow them out good all kinds of junk will come out goot keep spraying air till the line is dry ..do this to both condensor and evaporater..condensor is in the front and evaporatr in the back...install new orings ,,they need to be ac orings not regular black ones ..ac orings are either ed or blue ...oil all fittings with ac oil...lightly..install dryer and orifice tube ..the orifice tube goes in 1 way only so watch wich end pulls out ..now have some one evacuate the air out of the system ..once it holds 28 lbs steady you are good if not you have aleak ..add oil and 134a gas and go ......remember those hoses need to be changed to stop gas leaking out..it might take 2 months but it will happen....later randy