Question about Robinair Cool Tech 34700Z Recovery, Recycling, Recharging

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Will Not Clear and Will not Add Refrigerant

Hi, TIA. This is actually a 34700 post date split not a 34700Z. This was the only category I saw available. I purchased a 34700 in unknown working condition. My plan was to fix it up for my pops and give it to him for his garage. It needed both 96" hoses and all 3 36" hoses. I also drained and put new Robinair vacuum oil in the vacuum pump. The filter/drier appears to be new. After purchasing these I tried the unit. Unfortunately it will not clear nor will it add refrigerant. I called Robinair tech support they had me clean some of the solenoids, that did not help, nor do they seem to turn on for this process anyway so I'm not sure what the point of that was. At any rate, they had me check the vacuum at the suction port of the comrpessor. IN this particular unit this is the older compressor with all 3 fittings on one side. the 1 out of 3 fittings that point down is the suction. Without unhooking the other 2 and putting a vacuum gauge on the suction port I actually saw a little bit of vacuum when performing a 'mock add refigerant'. I asked them if this certainly meant that the compressor was bad and that it could not be an issue with the other two lines. They assured me it was a bad compressor. I ordered another compressor and installed it, I experience the same behavior, although, this time I unhooked 2 of the 3 lines, and if I put my thumb on one and gauge on the other I get good vacuum and quick. Any thoughts? Thanks Chris

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6 Suggested Answers

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Posted on Jan 02, 2017

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mhkamran
  • 180 Answers

SOURCE: Model Robinair 34700 Series 21699

Please do the following 1# Check your machine ISV tank liquid line quick connector.it's seems to be very tight,open little & try to charging.2# Rebuild charging solenoid.

Posted on Jun 25, 2009

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mhkamran
  • 180 Answers

SOURCE: ROBINAIR 34700Z ALWAYS FAILS VACUUM CHECK AND

Please check the following: Low side manifold gauge is going to -13"HG while you recover refrigerant from the vehicle.If low side gauge not rich to that lavel then vacuum sensor will detect pressuer &
it will stop you to make vacuum until you fix the problem.If it happen you may nee to rebuild/replace one or more of this solenoid.1#Vacuum solenoid 2# Recover solenoid.3# Recycle solenoid.Also check Low/High side small solenoids ( In the small block assy.)
If all of this solenoids working properly then check Vacuum pump capacitor & vacuum sensor.Hope this will help you to solve your problem.

Posted on Apr 09, 2010

mhkamran
  • 180 Answers

SOURCE: I have a Robinair 34700, during vacuuming and

Don't worry this is normal.Because while machine is running for vacuum or recycle mode,automatic air purge device will active for some time & it will purge air from ISV.

Posted on May 28, 2010

mhkamran
  • 180 Answers

SOURCE: Robinair 34700 recovery problem

It sound like one of the pressure trunsducer is not working or disconnected from the manifold assy.or from ISV tank.Please check Low,High and ISV tank pressure transducer

Posted on Jul 10, 2010

mhkamran
  • 180 Answers

SOURCE: Hi, My robinair model 34700Z

It is clear to me you need to Replace the Compressor! But if you want to make sure yourself, please do the following: Press recover & fix a vacuum gauge on your machin Compressor suction port & monito the gauge is going up to13"HG suction,if not then you need to replace the compressor.
I wish this will help you to solve the the problem. if so, pls vote for it. Good luck!

Posted on Aug 11, 2010

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1 Answer

Will not clear, will not add refigerant


Ok, you replaced the compressor so you had to of taken all that Freon you loaded by unloading it so as not to damage the new ac compressor. Let me explain it like this: pretend your compressor is like a bike tire and that only way to take the tire off is to remove the air in the inner tube. Once the inner tube is empty then it's safe to replace the tire "compressor." When charging the a/c line your need to check that its empty by using a/c gauge that shows if its empty and if it fills using Freon and turning wheel on the a/c gauge. I check for leaks also then to verify that my Freon isn't leaking from a/c lines using yellow die added to a/c gauge line. All I can say is get a friend that is willing to fix it by showing you how as so far it sounds like your spending a lot of money for several minor repairs needed to make it work. A/C repair is major profit for a mechanic as my brother is master mechanic and he makes $150s a hour to fix a/c.

Apr 13, 2014 | Cars & Trucks

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Robinair 34700 hi-p


Disconnected Air Purge lines. It was under high pressure (careful).

Feb 29, 2012 | Robinair Cool Tech 34700Z Recovery,...

1 Answer

Manual for Robinair SPX Model 34700


There are currently 2 models available
The 34700Z. Here's the link to the manual.
http://cache01.voyageurweb.com/otctools.com/newcatalog/products/523040.pdf
and the 347002K, here the link to this unit.
http://cache01.voyageurweb.com/otctools.com/newcatalog/products/124080.pdf.pdf
Have a great day.

Jan 06, 2011 | Garden

1 Answer

"Tank Full! Remove Refrigerant From


You should post your problem with Model number of the machine.
However if your machine model is 34700Z, you can try to do the following :
With power OFF, Open front panel cover and remove refrigerant manually from the ISV tank.Open Liquid hose from the tank,then press tank valve as needed.Hope this will solve your problem

Dec 15, 2010 | Robinair Cool Tech 34700Z Recovery,...

1 Answer

34700 unit when in the vacuum mode it sends R134 into the oil recovery bottle tank


Please check oil drain sensor(switch) or oil drain solenoid for any debris. If both are check OK, then check Vacuum,Recycle and charge solenoid for any debris or damage. Replace/rebuild as needed. Hope this will help you

Nov 03, 2010 | Robinair Cool Tech 34700Z Recovery,...

1 Answer

Robinair 34700 recovery problem


It sound like one of the pressure trunsducer is not working or disconnected from the manifold assy.or from ISV tank.Please check Low,High and ISV tank pressure transducer

Jul 08, 2010 | Robinair Cool Tech 34700Z Recovery,...

1 Answer

I have a Robinair 34700, during vacuuming and recycling I lose about 200 g refrigerant gas.


Don't worry this is normal.Because while machine is running for vacuum or recycle mode,automatic air purge device will active for some time & it will purge air from ISV.

May 28, 2010 | Robinair Cool Tech 34700Z Recovery,...

1 Answer

Model Robinair 34700 Series 21699 Date 09/97 very slow when recharging system? Same problem on any vehicle. Tried closing off high side and running the vehicle ac n/g Any Help Thanks Tony


Please do the following 1# Check your machine ISV tank liquid line quick connector.it's seems to be very tight,open little & try to charging.2# Rebuild charging solenoid.

Jun 23, 2009 | Robinair Cool Tech 34700Z Recovery,...

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