Newbie here, thanks in advance!!! I am replacing the a/c compressor and condensor due to leak in the condensor and burnt compressor. I ordered all the parts from a/c discount parts, but I have a few questions as I move forward.

I know the key to success is flushing the system. I only purchased an expansion valve for the front unit (dual a/c), now that I study the system before I start I am realizing it makes sence to replace and flush the rear expansion device and all the hoses from the rear as well.

Can anybody give some a/c advice before I start this venture.
Location of the front expansion devise? I assume in the cab.
Location of the rear expansion device?

Thanks

 

i will give you some great advice the rear expansion valve is a pain in the *** the box only comes out as one assembly and is huge, you will most likely spill coolant all over the cabin and get refridgerent dye all over the cabin lol, to find the front expansion valve follow the lines where they go into the cabin. rear remove entire center console and you see a big *** black blox and then unbolt everything

 

Thanks, Im on it...hoopefully I'll see a little a/c at the end of the tunnel

 

Should I try to remove the rear ac lines under the car to flush them as well or is it just necessary to lfush the from the main expansion valve forward

 

You need to put an inline filter before the compressor or you will be asking for trouble, dont flush an expansion valve, just replace it. You dont need to remove a line to flush it if you can get both ends of it disconnected. You cant flush most of todays (parallel) condensors (I see you are replacing it anyways), same for the receiver/drier. If any of the hoses has a muffler, you cant flush that either, it will need replaced. Of course refilling the entire system in strategic locations with the proper type of oil will be needed also. Lube all new orings and dont over torque fittings. Make sure the new or rebuilt compressor comes with the proper amount of the proper type of oil also.

Deep vacuum for an hour, leak check vacuum for an hour, static service first can of freon into the high side, allow the vacuum to draw it in, attach the can to your gauge set before starting but dont puncture the can yet so you can vacuum the hose too. (four hose setup) Dont let air into the system when you change cans, bleed pressure back out of the low pressure hose before tightening down the next can to purge moist air out. Service by weight only, not temp from the vents. How many ounces do you need and only use real R134a if thats what you need, none of this cheap aftermarket stuff that is supposed to do a better job, it wont take the same amount to use something else, service slow is the trick. 1500 to 2000 RPM, dont turn can upside down or shake too much, put can in bucket of hot water to speed up evaperation and to increase pressure in can.

 

i disagree with the 2 hour vacuum as long as you reach greater than 28hg for at least 15 minutes you will be fine, 28hg is the magic number as obviously thats where water boils under vacuum.