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Testing a/c for amount of R134
I have previously reported in threads about my a/c not working well in my 300SD. But today my employee/buddy has brought in an a/c gauge. It has levels indicated on it for the low and high side. How do I go about checking the amount of R134 in the system? Also how much does it hold? I apologize I did not search hard and it's probably be spoke of dozens of time. We are at work now. Thank-you.
Also for a recap my a/c sucks! It puts out on only moderately cold a/c if car is moving along at a good pace and not stopping. If you stop at a light or in stop and go traffic, the a/c puts out hot air. Also it makes a bad whistling noise when you stop or shut off a/c. Like it is releasing a lot of pressure. Also it sounds like the compressor(or something) is "ticking" while running. Stops when it is shut off. Any suggestions and ideas are greatly appreciated. The car was converted to R134 some years ago. When my Mom owned the car(been in family since 91) she had R134 added from time to time.
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1985 Mercedes Benz 300SD, TMU 2015 Chrysler 200S |
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That said there is really no way to know exactly how much refrigerant is in there. There are 2 ways to find out. 1-Recover the refrigerant into a recycle container and weight it. 2-Flush out the system and replace with the proper amount of refrigerant & oil. That last comment in bold scares me. When refrigerant leaks out, oil leaks out with it. Not only do you not know how much refrigerant is in there you don't know how much oil is in there either. Get too low on the oil and your compressor WILL seize up. Danny
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1984 300SD Turbo Diesel 150,000 miles OBK member #23 (\__/) (='.'=) This is Bunny. Copy and paste bunny into your (")_(") signature to help him gain world domination |
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Yep, what danny said. Also lack of oil can mean black death (metal shavings) pumped through the system before the compressor seizes.
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RRGrassi 70's Southern Pacific #5608 Fairmont A-4 MOW car 13 VW JSW 2.0 TDI 193K, Tuned with DPF and EGR Delete. 91 W124 300D Turbo replaced, Pressure W/G actuator installed. 210K 90 Dodge D250 5.9 Cummins/5 speed. 400K |
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R134 out and put in new. I'm not the best informed when it comes to a/c. But I thought the oil was mixed up in the can with the R134? Please pardon my ignorance. What is the proper amount of oil and refrigerent for an 85 300SD? Actually since this is a newer style compressor it may be listed on it somewhere?
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1985 Mercedes Benz 300SD, TMU 2015 Chrysler 200S |
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