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  #1  
Old 10-21-2003, 01:15 PM
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TO RENT OR TO BUY... that is the ..

.... question. Redoing my evap on my SL500 and pretty soon changing my compressor on my 560SL. Local O'Reilly has them for rent for $400 with history unknown. On the other hand, I can get my own , brand new for the $200 +/- neighborhood. I know this is such a minor thing to decide on but....what are your experiences on the rental units...

...just when you guys have time , I would appreciate the input.
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  #2  
Old 10-21-2003, 01:30 PM
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Are we talking vacuum pumps for evacuation? Rental fee? I think a sentence or two got left off the post, but then again, I can be pretty dense.
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  #3  
Old 10-21-2003, 01:31 PM
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my mistake... Vacuum pump for evacuation. And that is correct- rental fee: $400.
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1978 280 CE silver
1986 560 SL black
1987 300 SDL cream
1994 SL 500 brilliant green
1997 E 300d dessert silver
2005 FORD F250 Superduty Crew cab 4x4

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  #4  
Old 10-21-2003, 03:24 PM
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With a $400 rental fee, buy this instead and let us borrow it
http://www.acsource.com/product.asp?0=234&1=283&3=220
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  #5  
Old 10-21-2003, 03:40 PM
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I'd be more than happy to rent you my yellow jacket evacuation pump for a weekly fee of $390 dollars.

Of course I think I only paid $220 for it a couple of years ago so it may not be the best deal for you - but I'll stand by my offer.
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  #6  
Old 10-21-2003, 05:06 PM
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If you have an air compressor, Harbor Freight tools has a venturi-style vacuum unit that is made for this type of work. It's about $15.
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  #7  
Old 10-21-2003, 06:53 PM
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Venturi type....wonderful idea.... good results????
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1978 280 CE silver
1986 560 SL black
1987 300 SDL cream
1994 SL 500 brilliant green
1997 E 300d dessert silver
2005 FORD F250 Superduty Crew cab 4x4

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  #8  
Old 10-22-2003, 03:36 AM
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No. Venturi-generated vacuum is fine for sample drying in chemistry lab but is incapable of generating the > 29" Hg vacuum necessary for A/C system evacuation.

The Harbor Freight tool vacuum level is listed at 28.3" Hg, requires two minutes to reach that level internally (before being connected to an A/C system) and uses 4.2 cf of air per minute. An air compressor of appropriate capacity is necessary just to power this.... and lower air flows will result in even poorer evacuation. Regardless of the length of time run, this venturi pump is incapable of reaching the level of evacuation needed.

Invest in a proper vacuum pump... it will pay for itself in the long run. And buy several spare quarts of pump oil... rotary vane pump efficiency falls off as the oil absorbs water vapor and debris scavaged from the system.
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  #9  
Old 10-22-2003, 10:42 AM
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Another DIY option

Find an old refrigerator or dehumidifier and salvage the motor/pump assembly as a vacuum pump. I've done a few jobs that way.

Forget the rental.
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  #10  
Old 10-22-2003, 12:59 PM
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rental issue solved

...a good friend of mine borrowed an electric vacuum pump from a shop for me..Now, how do I attach the pump to the gauges then to the car?????Which valves should I open or close???
Boy do I need directions!!!! Thanks for the help.
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1978 280 CE silver
1986 560 SL black
1987 300 SDL cream
1994 SL 500 brilliant green
1997 E 300d dessert silver
2005 FORD F250 Superduty Crew cab 4x4

____ADMU____
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  #11  
Old 10-22-2003, 01:20 PM
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Here is an entire AC evacuator system on Ebay for $88 and 8 hours left
EBAY
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  #12  
Old 10-22-2003, 01:31 PM
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Unhappy

.... i use 134 A. And all I need now are gauge set up instructions to vacuum the system. Thanks for the info, TX76513.
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1978 280 CE silver
1986 560 SL black
1987 300 SDL cream
1994 SL 500 brilliant green
1997 E 300d dessert silver
2005 FORD F250 Superduty Crew cab 4x4

____ADMU____
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  #13  
Old 10-22-2003, 02:52 PM
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I bought a set of manifold gauges, and frankly I rarely use them. When charging into an empty system, I usually charge to vent temperatures. When the vent temperature stops dropping, I know I've put enough refrigerant into the system.
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