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Low Side Pressure Recommendations
On my 91 300D, AC was weak due to slow leak and aux fans weren't coming on at all. I didn't have a proper set of gauges (my next purchase), but I did have a charging gun with a low side gauge. Reading was about 37 psi at 80F or so.
The charging gun came with the pressure recommendations at the end of this post. So I added refrigerant until pressure was about 45 (took about 10oz.). AC is cold, fans are coming on. But my concern is that, by simply using these generic recommendations, I may have overcharged the system (based on what a couple of knowledgeable MB folks have told me). Thoughts? Thanks for your continued help as I continue along the learning curve. Ambient Temp Pressure 65 25-35 70 35-40 75 35-45 80 40-50 85 45-55 90 45-55 95 50-55 100 50-55 105 50-55 110 50-55
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14 E250 Bluetec "Sinclair", Palladium Silver on Black, 153k miles 06 E320 CDI "Rutherford", Black on Tan, 171k mi, Stage 1 tune, tuned TCU 91 300D "Otis", Smoke Silver, 142k mi, wastegate conversion 19 Honda CR-V EX 61k mi Fourteen other MB's owned and sold 1961 Very Tolerant Wife |
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I would NEVER recommend charging based solely on low side pressure. Buy, beg, or borrow a manifold gauge set so you're not trying to fight with one arm tied behind your back.
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Buying a set this weekend. Do I use pressure recommendations that come with kit, or is there something more specific for my car?
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14 E250 Bluetec "Sinclair", Palladium Silver on Black, 153k miles 06 E320 CDI "Rutherford", Black on Tan, 171k mi, Stage 1 tune, tuned TCU 91 300D "Otis", Smoke Silver, 142k mi, wastegate conversion 19 Honda CR-V EX 61k mi Fourteen other MB's owned and sold 1961 Very Tolerant Wife |
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ahh. now I understand, your PM's didn't have all this info.
yes, I'd say you are overcharged. heed the warnings I gave you in the PM's and larry's word is golden. I think now you need to go to a shop and get some 134 removed from the system. like I told you in the PM's it's just too difficult to explain all the variables to a DIY without any tools. the slow charging procedure I outlined will get you in the ballpark, but please don't pay attention to the charging chart. showing you low pressures based on outside ambient leaves out a huge amount of info for getting your system right.
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John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread "as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do! My drivers: 1987 190D 2.5Turbo 1987 190D 2.5Turbo 1987 190D 2.5-5SPEED!!! 1987 300TD 1987 300TD 1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere! |
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Quote:
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14 E250 Bluetec "Sinclair", Palladium Silver on Black, 153k miles 06 E320 CDI "Rutherford", Black on Tan, 171k mi, Stage 1 tune, tuned TCU 91 300D "Otis", Smoke Silver, 142k mi, wastegate conversion 19 Honda CR-V EX 61k mi Fourteen other MB's owned and sold 1961 Very Tolerant Wife |
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FREE Generic A/C training material for beginners:
Quote:
http://www.peachparts.com/shopforum/showthread.php?t=142408 Have a great day
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ASE Master Mechanic asemastermechanic@juno.com Prototype R&D/testing: Thermal & Aerodynamic System Engineering (TASE) Senior vehicle instrumentation technician. Noise Vibration and Harshness (NVH). Dynamometer. Heat exchanger durability. HV-A/C Climate Control. Vehicle build. Fleet Durability Technical Quality Auditor. Automotive Technical Writer 1985 300SD 1983 300D 1984 190D 2003 Volvo V70 2002 Honda Civic https://www.boldegoist.com/ Last edited by whunter; 08-15-2010 at 11:08 PM. |
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