2007-07-27 07:45:08 · 5 answers · asked by ? 2 in Cars & Transportation ➔ Maintenance & Repairs
AC system-134a -assuming no leaks. 28.3 inch merc. I'm at sea level.
2007-07-27 08:06:10 · update #1
System has been recovered and flushed. Will be installing new compressor and drier tomorrow and then vacuuming.
2007-07-27 08:08:21 · update #2
I'll assume you are talking about a AC system. You should have a vacuum gauge on the line to see what the vacuum actually is. You could let it run all day and if there is a leak in the system then you'll never get it down to the right vacuum level. If everything is good, most people let them run for a 1/2 hour or a little more just to be sure. good luck.
2007-07-27 07:51:33 · answer #1 · answered by Fordman 7 · 0⤊ 0⤋
Ideally a vacuum pump used to evcuate an automotive a/c system should "pull" a vacuum of 29.5 or higher. A vacuum pump that only supplies 28.3 inches of vacuum will require a much higher ambient temperature to ensure that all of the moisture in the system is "boiled" off during the evacuation process. The removal of all moisture in the system is a critical step as once the dessicant in the accumulator or receiver/drier is saturated and can hold no additional moisture, the now "free" moisture in the system will react with the refrigerant to create an acid, that eventually causes the pin holes in the condenser, evaporater, etc. which you may have seen at some point.
2007-07-27 10:30:47 · answer #2 · answered by Lee 2 · 0⤊ 0⤋
I like to go into the 250 microns area with a light bulb to heat the coil.
2007-07-27 08:03:11 · answer #3 · answered by William F. D 4 · 0⤊ 0⤋
till the gauge goes down to 0 and stayes there for an half of hour after you close the gauges
2007-07-27 14:56:32 · answer #4 · answered by Mike H 3 · 0⤊ 0⤋
What system?
2007-07-27 07:48:47 · answer #5 · answered by nbr660 6 · 0⤊ 0⤋