Here is a chart that shows ambiant temperature, low & high pressures. http://www.ackits.com/index.cfm?fuseaction=Chart
-------------- Original message -------------- In a message dated 8/17/2005 2:41:35 P.M. US Mountain Standard Time, [EMAIL PROTECTED] writes: Hey Jim, Would those numbers be the same for a W126 300SD? Are those numbers dependant upon a certain ambient temperature? Are these numbers on a MB AC manual or this is generally? Lynn (got the R12, got the hoses, waiting on the gauges to arrive any day now) On 7/24/05, [EMAIL PROTECTED] <[EMAIL PROTECTED]> wrote: > > > In a message dated 7/24/2005 4:43:19 P.M. US Mountain Standard Time, > [EMAIL PROTECTED] writes: > Can anyone tell me what the pressures should be for a 126 300SDL running > 134a? High/Low > > > I would look for 30 to 50 PSI on the suction side and 200 to 350 on the > high side. Pressures would run towards the high side of the range with a > fully loaded AC. Lynn, The numbers are general for all R134 AC systems. As I note, the pressures would scale towards the higher end of the range as the system loads up, which would include rising ambient temperature. If you are looking in a book you won't find too many 126s that ran R134 from the factory. What year is yours? SD or SDL, makes little difference. I note you have R!2, do you also have some proper mineral oil? Many times, a slow leak will be dealt with by adding freon every season , but the oil is also leaking out and sooner or later, the compressor will die! 2 ounces of oil will often save the day! With R12, Pressures will run about 10 PSI lower on the suction side and maybe as much as 50 PSI lower on the high side. Good luck, Jim Friesen Phoenix AZ (only hit 104 today!) 79 300SD, 261 K miles 98 ML 320, 137 K miles
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