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After Vacuum, 75 PSI on High and Low side?

EdgeMan on Fri July 06, 2012 10:30 PM User is offline

Year: 1985
Make: Mercedes
Model: 300CD
Engine Size: 5 Cyl Di
Refrigerant Type: Enviro-Safe
Ambient Temp: 85
Pressure Low: 75
Pressure High: 75
Country of Origin: United States

So I vacuum my Mercedes Diesel for 1 hr. Then I close the manifold gauges and and 45 minutes later no leakage. So I recharge with 2 cans of Enviro-Safe and afterwards the gauges show 75 lbs. on both high and low side and no cooling. The system wasn't working when I bought the the car a couple of months ago. Does this mean I have a leak although the vacuum showed a tight system? Or a bad compressor?

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'83 Mercedes 300
'85 Mercedes 300CD

TRB on Sat July 07, 2012 12:50 AM User is offlineView users profile

Kaboom.

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ezautoac on Thu October 04, 2012 11:05 PM User is offline

maybe neither... forgive me for asking. Is the compressor engaging? ( I ask because my apprentice once called me over and said remember when you said if the compressor isn't sucking or blowing its probably worn... After looking I notices the A/C belt wasn't even on the vehicle.)

iceman2555 on Fri October 05, 2012 2:48 PM User is offlineView users profile

ezautoac, read your info on the Apple site....wondering where the specifications for retro fitting refrigerant amount specifications originated? Do you indicate in the program, the associated operational pressures for a retro fitted system? Any chance of a quick 'look-see' of the supplied info without purchasing the app....would like to put a 'visual' on the seemingly very informative program.

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The strongest reason for the people to retain the right to keep and bear arms is, as a last resort, to protect themselves against tyranny in government.
Thomas Jefferson

ezautoac on Fri October 05, 2012 6:50 PM User is offline

The retro fit section Isn't a specification section, rather a refrigerant weight calculator and information on new oil type that is needed(If at all needed).

iceman2555 on Sat October 06, 2012 12:07 PM User is offlineView users profile

How 'bout posting a 'sample' of the info included in your 'refrigerant weight calculator' and lubricant section. It would be helpful to see exactly what info is offered for the DIY'er or installer.

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The strongest reason for the people to retain the right to keep and bear arms is, as a last resort, to protect themselves against tyranny in government.
Thomas Jefferson

ezautoac on Sat October 06, 2012 7:53 PM User is offline

There are screenshots of the app in the apple app store you can check it out here. http://www.facebook.com/EzAutoAc there is the facebook link. I don't want to use the forum as advertising so I don't want to go too in depth with it.(apologies)

Edited: Sat October 06, 2012 at 7:58 PM by ezautoac

iceman2555 on Sat October 06, 2012 8:38 PM User is offlineView users profile

You already are using the forum as a advertisement.

"EZ auto A/C is an iphone app for anyone who wants to repair automotive A/C systems, from Professionals to DIYers. Diagnostics and Specs for 5000 cars for the price of a coffee. check it out in your apple app store. "

Simply wish to see exactly what one would be purchasing from your app.....esp since the one 'review' appears to have been posted....well...let's say the review appears to be a bit....questionable.

A couple of 'copy and paste' samples indicating....say a retro fit recharge rate and pressures for a 1992 Chevrolet 1500 truck and 1992 Honda Accord would be great to preview your offerings.


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The strongest reason for the people to retain the right to keep and bear arms is, as a last resort, to protect themselves against tyranny in government.
Thomas Jefferson

ezautoac on Sun October 07, 2012 8:57 PM User is offline

There is more than one review , your phone must not be working properly or you haven't actually checked.

"A couple of 'copy and paste' samples indicating....say a retro fit recharge rate and pressures for a 1992 Chevrolet 1500 truck and 1992 Honda Accord would be great to preview your offerings. " Also there was never a claim made about specific instruction on RETROFITTING a car, I though I already clarified that two posts ago but maybe you skipped over that also. "The retro fit section Isn't a specification section, rather a refrigerant WEIGHT CALCULATOR and information on new OIL TYPE that is needed(If at all needed)."

I would have thought as someone who is knowledgeable in the field, you would have paid the 3 dollars to see what the app was about and maybe then given a review on it, instead of trying to discredit it without even taking a look at it. If they you don't like it , tell me what you don't like about it and I will try to accommodate it like along with all the input I receive in upcoming versions.

iceman2555 on Sun October 07, 2012 9:38 PM User is offlineView users profile

I did use my phone and the Apple store to preview the app....however, both seemed to indicate the same information or lack of information. I did notice that your 'screen shot' for retro fitting indicates a r12 to 134a, a r12 to hc12a and 134a to hc 12a. This alone tends to make me a bit reluctant to fork over the cash. As far as discrediting the app...and the $3.00 bucks.....the dollars are not a problem....I simply wished to see more of your program prior to investing in a second info program. One that may be a bit dubious and lacking in valid information. As I stated the 3 bucks is not a problem...but I would rather enjoy the refreshment of a couple of very cold cokes, esp if the app does lack informative repair info. Over the years there have been tons of info posted on various sites concerning retro fitting (thankfully this is dying) procedures that are at the very least.....lacked a tremendous amount of truthful info. The retro weight calculator for retro fitting was an idea that peeked my interest, I simply wished to see exactly what was presented. Over many years have seen this info presented in various forums and venues. The statement that the app included this feature to "figure out what type of oil and what quantity of refrigerant to charge a system with is no longer necessary" really peaked my interest.
Thanks for the 'invitation', think I'll pass.....perhaps your site offers informative info.....but for some unknown reason.....perhaps it is simply the ezautoac thing.....never thought of ac repairs as 'easy'.....have talked from many 'well seasoned' techs that were pulling their hair out because of what was, at first, thought to be a 'easy' repair.....that makes me doubtful.
Good luck !!!!

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The strongest reason for the people to retain the right to keep and bear arms is, as a last resort, to protect themselves against tyranny in government.
Thomas Jefferson

ezautoac on Mon October 08, 2012 1:37 AM User is offline

Ok , I'm sorry you feel that way. The goal is to help people who arnt as seasoned and knowledgeable as you, obviously you won't benefit from the app.

chris532008 on Mon October 08, 2012 2:24 PM User is offline

if the compressor is turning check to see if restrictor device is in position either orfice tube or expansion valve and not wide open, if restrictor is operational compressor has to be shot and then a lot of sludge will be in the system

JHZR2 on Sat July 20, 2013 1:02 PM User is offline

Have you ever looked at a static temperature-pressure chart?

Go to the ES site and pull one down - it compares R12, 134a and ES refrigerants.

The reality is that if youre seing 75 psi (on both sides) youre seeing an equilibrated static pressure in the system.

Do you hear the compressor come on? Does the ACC work? 85 w123 cars also have a klima relay underhood that may need to be jumpered if it doesnt work anymore.

I assume this has the R4 compressor. Can you jumper it to verify that the clutch engages?

No way would I have just willy-nilly dumped an HC refrigerant into a vacuum in a car without monitoring vent temperatures. It may be way too high. Did you monitor mass of the charge going in?

Again, if youre seeing 75-ish psi, both sides, Ill bet the compressor isnt engaging and it is just the static pressure of the vapor-liquid equilibria for the mix.

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