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.
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
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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
Experienced Diesel Technician