i need to replace the high pressure line on my a/c in a 1999. i have the r134, gauges and pump. i do not know how to bleed off the remaining freon to replace line. Or what my pressures should be when system is recharged.
Already Tried: nothing. i've always had someone else do it.
If you don't have a recovery machine, you can call around to shops to see how much they would charge to evac system, or you could connect your gauges and open system up ( this is not recommended but alot of people do it just letting it out into open area, if you do this get away for awhile) again I don't recommend it but its been done for years, I have a evac machine for this reason, but in a bind you can do it. As far as pressures it depends on temp outside, vacuum system down real good fill to spec then post your pressures and outside temp
i dont know what specs r for system. outside temp is 95
Relist: Other.i want a reply asap so i can get to work
Well I can't tell you how much freon goes in your truck when you only list its a 99, what make model etc?
ch613 460 engine
Relist: Other.no answer yet
if you have no machine you can dump the charge in a bottle of water.then you can pull your line and replace,you will want to change the drier as well because you have the system open.vacume system down for a few hours and charge.open the high side without the truck on and let it take a static charge i usually go till it stops.turn the a/c on and slowly fill through the low side.your truck should take 2-2.8 lbs.if you dont have a scale you can watch the sight glass on top of the drier when you stop seeing bubbles then you know the system is full
Experience: Experienced Diesel Technician