A/C recommendations for the MB vehicles - Page 5 - PeachParts Mercedes-Benz Forum

galaxy710 · #1 04-13-2012, 05:33 AM

This is a favorite topic on the forums.The only way to evacuate the oil is to open and flush the system.

SpecialDelivery · #2 04-13-2012, 01:07 PM

Quote:

Originally Posted by galaxy710

This is a favorite topic on the forums.The only way to evacuate the oil is to open and flush the system.

this makes sense, what is your choice of solvent for this

1980sd · #3 04-17-2012, 02:42 PM

I just picked up one of these:

ATD-3441, ATD-3443, ATD-3445 - Vacuum Pumps - ATD Tools, Inc.

I got the 3441...

It slowed things down (and cost $$) last summer not having AC tools. So far I have a gauge manifold, a vacuum pump and a hose crimper.

I'd like to get a "sniffer" but can anyone think of some other AC tools we DIY's may find handy?

Matt L · #4 04-22-2011, 07:31 PM

Dry enough to paint isn't dry enough for AC work.

leathermang · #5 04-23-2011, 02:18 AM

To change to a VOV you would be changing your entire system ... not fixing your system by any stretch of the imagination.... that is simply a totally different method of operation and all the things that go along with it ... electronics... would be different...

vstech · #6 04-23-2011, 10:50 AM

Quote:

Originally Posted by amosfella

Scratch oil as the problem... Too much liquid refrigerant was put in... Do I just vacuum the system down far as I can, and refill??

the problem is you do not know how much oil is in the system. there needs to be an EXACT amount of oil in there, and it needs to be distributed correctly. then the EXACT amount of refrigerant needs to be in there.
all this needs to be in place in a CLEAN set of coils, and a working expansion valve.

leathermang · #7 04-23-2011, 12:11 PM

Having too much oil or refrigerant will work your system to death in short order... not to mention not providing the cooling you deserve...

amosfella · #8 04-23-2011, 03:43 PM

The idiot that filled the thing didn't add oil to the system. He put the hydrocarbon in in it's liquid form. I think I"ll suck the system out and refill it properly... It's about 70 pounds on the low side. manufacturer says that 60 shoudl be max...

vstech · #9 04-24-2011, 12:06 AM

... 70 on the low side at what temp on the inside? what blower speed? windows up or down? fan in front of the condenser? what temp outside?
see the problem? there's no way to know from only one reading. 70psi... without knowing all the other symptoms. what RPM is the motor at?

amosfella · #10 04-24-2011, 01:40 AM

4 degrees C at the coils according to the sensors. blower on max, windows up, condenser fan off, 12 C outside, idle, somewhere around 550-600.

leathermang · #11 04-24-2011, 10:35 AM

Windows are supposed to be DOWN..
you are not trying to cool the inside of your car..
you are trying to be sure the compressor and related stuff is working at its max....

vstech · #12 04-24-2011, 10:49 AM

it's 53.6F outside, and you are trying to set pressures?
is the 4C at the output or input of the coils?
the txv is going to be seriously regulating the flow with low ambient temps. pressure is going to be irrelevant

leathermang · #13 04-25-2011, 06:05 PM

Good solid references :

sight glass specific non MB first one....

http://aircondition.com/knowledge_base/TheBasics/Components/ReceiverDrier.html

http://aircondition.com/tech/questions/30/

http://www.aircondition.com/tech/questions/19/What-are-the-Benifits-of-Leak-Testing-with-Nitrogen%3F

http://aircondition.com/knowledge_base/LeakDetection/OtherMethods.html

http://aircondition.com/knowledge_base/TheBasics/Flushing/BlackDeath.html

citationtech · #14 05-03-2011, 07:59 AM

found the bugger! for anyone looking for the high side / high pressure, service port / fitting on a w210 e300, e320, e430, it's located behind the fan shrouding under a small cover the to the left of the driver's headlight. attached is a picture of the cover in question and my fancy label i made.

vstech · #15 05-03-2011, 02:25 PM

SERIOUSLY???
wtf is MB thinking with that?!!!
having both ports is sure helpful to working on a/c... of course, if some neophite hooked a can of freon to the high side they could easily kill themselves... I suppose it's to prevent that kind of thing...