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

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Every time machine is put on vacuum, it starts purging air

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This is a normal function during vacuum. But it can happen if the refrigerant is not 100% pure. However if it is so ling then you may need to rebuild airpurge solenois or replace Automatic airpurge device. Hope this will help you to rectify the problem,if this solution is helpful to you please vote for it. Good luck.

Posted on Aug 03, 2010

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Having trouble getting my 2007 GMC Acadia to start after putting in fuel. It starts with no problem any other time, but whenever i put gas in it has trouble starting backup.


When a car will not run right after refueling, it is usually the vent valve, that vents the tank.
If not opening, then using a small amount of gas will create a very strong vacuum, and not allow the car to run.
Try cracking the gas cap a little, to let air in and reduce the vacuum. Automotive Evaporative Emissions Part One

Feb 25, 2017 | GMC Acadia Cars & Trucks

1 Answer

P0496 code


Hi there:
DTC P0496 - EVAP (evaporative emission) Flow During A Non-Purge Condition


The P0496 DTC code is a generic code which applies to all vehicle makes. A quick search on the 'net shows that this code seems to be more common with GM (Chevy, Pontiac, etc.) vehicles. In Acura, Honda, Hyundai, Kia, and Mazda vehicles, this code is described "EVAP system high purge flow" which is the same thing.


This DTC checks for undesired intake vacuum flow to the EVAP system. The control module seals the EVAP system by commanding the EVAP canister purge solenoid valve OFF and the EVAP canister vent solenoid valve ON. The control module monitors the fuel tank pressure (FTP) sensor to determine if a vacuum is being drawn on the EVAP system

If vacuum in the EVAP system is more than a predetermined value within a predetermined time, this code is set and the MIL (malfunction indicator lamp) is illuminated.



Symptoms of a P0496 DTC will include MIL illumination, and most likely no other noticeable symptoms. Some may experience a hard start / crank condition. In some cases the engine may run rich which may not detected, but can cause damage long-term (think: catalytic converter damage).

Potential causes of a P0496 EVAP code include:

  • Faulty purge or vent solenod/valve
  • Plugged EVAP canister
  • Failed EVAP / fuel pressure sensor
  • Poor electrical connection
  • Short electrical circuit condition
  • (Hyundai, Isuzu)
  • Faulty canister purge valve
  • Blocked vapor canister
  • Faulty vent solenoid
  • Leaking EVAP system hose (Hyundai)
  • Faulty purge flow sensor (Kia, Mazda)

Possible Solutions

The most common fix for this DTC is to replace the purge solenoid valve. However, be sure to do a proper diagnosis before replacing parts!

Ideally you would use an advanced scan tool, with the ignition on and engine off, you seal the EVAP system using the Seal/Purge function. Then, watch the fuel tank pressure sensor reading when you turn the purge off. If the pressure value is higher than the normal range set by the manufacturer, replace the EVAP canister purge solenoid valve. Refer to a model-specific repair guide for the proper specification.


If you don't have access to the scan tool, you could always disconnect the vacuum line at the purge valve going back to the charcoal canister. Unplug the electrical connector on the purge valve, start the engine, then put your finger on the valve where you disconnected the line. If you can feel vacuum there, the purge solenoid valve is faulty and needs to be replaced. Alternately, you could simply remove the purge solenoid valve and blow into it. It is normally closed, so if air goes through then you need to replace it.


If the purge valve checks out good, either the problem with the valve is intermittent or there is a problem with the fuel tank pressure sensor. To test the fuel tank pressure sensor you will need to have a high end scan tool to monitor the tank pressure with the gas cap removed. If the sensor shows vacuum with the gas cap removed, there is a problem with the fuel tank pressure sensor.


Here is a picture of one purge solenoid valve. Yours may look similar or different, consult a factory service guide or your local vehicle dealership for more details.


Hope this helps; also keep in mind that your feedback is important and I`ll appreciate your time and consideration if you leave some testimonial comment about this answer.

Thank you for using FixYa, have a nice day.

Aug 22, 2012 | Cars & Trucks

1 Answer

To start with my power steering pump was making a little noise and also had bubbles in the resevoir so i put a new power steering pump on it.not a rebuilt one. when i started it up i still have the bubbles...


Section 11-00: Steering System-Service 1999 Taurus, Sable Workshop Manual SERVICE PROCEDURES Purging Power Steering System of Air NOTE: If the air is not purged from the power steering system correctly, a second customer concern or pump failure could result. This condition can only occur on pre-delivery vehicles with evidence of aerated fluid or vehicles that have had steering component repair.

A whine noise heard from the power steering pump may be caused by air in the system. The following procedure must be performed whenever any of the following are performed:
  • All power steering noise complaints with evidence of aerated fluid on pre-delivery vehicles only, prior to any component repair.
  • After any power steering system component (for example, gear or hose) has been replaced and the noise is heard.
Fluid Level Top-Off Procedure
  1. Check and fill pump reservoir to dipstick full cold or remote reservoir center mark.
  1. Disable ignition by removing Fuse 10 in the fuse junction panel.
  1. Crank engine 30 seconds, check fluid level and add if required.
  1. NOTE: Do not hold steering wheel on stops.

    Crank engine 30 seconds while cycling the steering wheel lock to lock.
  1. Check fluid level and add fluid if required.
Air Purge with Vacuum External Source Procedure - 3.0L (2V) Engine, Flex Fuel and 3.4L SHO Engine
  1. Tightly insert the rubber stopper of the air evacuator assembly into pump reservoir.
  1. Reinstall Fuse 10 used to disable ignition and start vehicle.
  1. Apply 20-25 in-Hg (85-88 kPa) maximum vacuum for minimum of three minutes at idle; maintain maximum vacuum with vacuum source.
  1. Release vacuum and remove vacuum source.
  1. Add fluid to full warm or reservoir center mark.
  1. Reinstall vacuum source and apply 20-25 in-Hg (85-88 kPa) vacuum.
  1. NOTE: Do not hold steering wheel on stops.

    Cycle steering wheel from lock to lock every 30 seconds for approximately 5 minutes.
  1. Shut engine off, release vacuum and remove vacuum source.
  1. Add Motorcraft MERCON Multi-Purpose (ATF) Transmission Fluid if necessary and install dipstick or reservoir cap.
  1. NOTE: Do not hold steering wheel on stops.

    Start engine and cycle steering wheel from lock to lock every 30 seconds for approximately 5 minutes.
  1. Check for oil leaks at all connections.
  1. In severe cases it may be necessary to repeat air purge with vacuum source procedure.
Air Purge with Vacuum External Source Procedure - 3.0L (2V) and 3.0L (4V)
  1. Add Motorcraft MERCON® Multi-purpose (ATF) Transmission Fluid XT-2-QDX or MERCON® equivalent to approximately 2.5 cm (1 in) (make a mark) above the top of the supply line.
  1. Tightly insert the rubber stopper of the air evacuator assembly into the pump reservoir.
  1. Apply 85-88 kPa (20-25 in-Hg) maximum vacuum for a minimum of three minutes.
  1. Add Motorcraft MERCON® Multi-purpose (ATF) Transmission Fluid XT-2-QDX or MERCON® equivalent until the level is at the marked point.
  1. Repeat Steps 3 and 4 until the fluid level stabilizes.
  1. Check reservoir level and add Motorcraft MERCON® Multi-purpose (ATF) Transmission Fluid XT-2-QDX or MERCON® equivalent to the FULL WARM (MAX) mark.
  1. Install the number 10 fuse in the fuse junction panel. Start the engine.
  1. NOTE: The front wheels must be off the floor during lock-to-lock rotation of the steering wheel.

    NOTE: Do not hold the steering wheel on stops.

    Reinstall the vacuum source and apply 85-88 kPa (20-25 in-Hg) maximum vacuum and cycle the steering wheel from lock-to-lock every thirty seconds for a minimum of 5 minutes.
  1. Shut the engine off, release the vacuum and remove the vacuum source.
  1. Add Motorcraft MERCON® Multi-purpose (ATF) Transmission Fluid XT-2-QDX or MERCON® equivalent to the FULL WARM (MAX) level. Install the dipstick or reservoir cap.
  1. NOTE: Do not hold the steering wheel on stops.

    NOTE: In severe cases, it may be necessary to repeat air purge with vacuum source procedure.

    Start the engine and cycle the steering wheel from lock-to-lock every thirty seconds for approximately five minutes.
  1. Lower the vehicle front end.
  1. Check for oil leaks at all connections.

Jul 24, 2011 | 1999 Ford Taurus

2 Answers

My 1995 subaru legacy lsi cuts out when I rev the engine around 1 rpm. Plus the check engine light is on. I took it to the dealership and they couldn't fix it, but they got a code from the check engine...


code p 0441 refers to evaporative emission (EVAP) system --incorrect flow detected ==== causes --- hose connection/s--- intake leak---EVAP canister purge valve replace the purge valve

May 21, 2017 | 1995 Subaru Legacy

1 Answer

What is po411 and po445 for 2006 vw jetta/


P0411- Means Secondary Air Injection System Incorrect Flow Detected!
Possible causes - Vacuum hoses damaged.
- Air Pump inoperative.
- Air bypass solenoid circuit open.
- Air bypass solenoid leaking/blocked or stuck open/closed.
- Air diverter valve leaking/blocked or stuck open/closed.
- Air air hoses r Possible solution - Visually inspect vacuum lines for disconnects in the AIR systems and visually inspect for proper vacuum line routing. Repair if necessary.
- Disconnect the air pump hose at the solenoid valve, start the engine and see if there is air being pumped P0445- Means Evaporative Emission Control System Purge Control Valve Circuit Shorted! Possible causes - Damage harness or connectors to the Purge Control Valve
- The valve circuit is open or shorted
- EVAP canister purge volume control solenoid valve may be faulty
P0445 Description The EVAP canister purge volume control solenoid valve uses a ON/OFF duty to control the flow rate of fuel vapor from the EVAP canister. The EVAP canister purge volume control solenoid valve is moved by ON/OFF pulses from the ECM. The longer the ON pulse, the greater the amount of fuel vapor that will flow through the valve. When is the code detected? - An excessively high voltage signal is sent to ECM through the valve

Jan 11, 2011 | 2006 Volkswagen Jetta

2 Answers

Cool tech 34788 purges alot. Excessive purge time and set error messages for being unable to purge.


Please check 1# The refrigerant which you'v add to the machine, it may CONTAMINATE or NOT PURE R134a. the machine will purge continue while active VACUUM mode if refrigerant is not origenal ! Identify refrigerant if possible.2# Check the automatic air purge device & air purge solenoid repair or rebuild as require

Jul 13, 2010 | Robinair Cool Tech 34700Z Recovery,...

2 Answers

AT MACHINE TURN ON DISPLAYS UNDER HIGH PRESSURE AND DISPLAY SAYS TO RESET WITH MAIN MENU BUTTON.BUT WILL NOT RESET


This is a common problem of Robinair 34700Z / 347002k & 347112k series machine.so don't worry just check the following :- 1# Verify the ISV tank is not overfilled.if full,remove some refrigerant manually from tank. 2# Purge excess air from the tank manually.( Open air purge hose from the tank,then press tank valve as needed to purge air from the tank) 3#Check the air purge solenoid & High pressure switch for proper operation.Hope this will solve your problem, Best of luck & vote for my solution!

Jul 12, 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,...

2 Answers

How do i connect air conditioning outside unit to the inside unit, can it be done with out a vacuum pump


By the book no, However production is another thing, reality is, very few new homes are ever evacuated, if at all they are purged with refrigerant a bit, If me I would do it, if unable , purge a bit.

Apr 24, 2010 | Heating & Cooling

2 Answers

Error codes P0442 and P0455 in Dodge Dakota 2001


Hello shoretex...Yes sir you can repair this yourself...
p0442 is medium leak detected ...p0456 is small leak....and p0440 is a general evap system failure.. evap codes are a common thing. gas caps are an inexpensive place to start. There are two types of evap hoses on the Dodge... hard plastic and soft rubber.... before you replace parts check the soft rubber first at the evap cans and pump located about a foot in front of the gas tank fill pipe on trucks located next to the transfer case or right behind the trans on the driver side. hard plastic lines will brake or rub through...check spots where lines come in contact with anything. this is a common thing with older trucks...hair line cracks will kick a p0442 code, and a p0445 code...When you find a leak, repair it, and rescan...sometimes there are several leaks, continue with inspection and repairs until you get it all fixed up.... Remember..start at simple and work from there...
i will post the evap. system in more detail to help you troubleshoot the problem.
EVAP System: The Evaporative Emission (EVAP) Control system used on all vehicles is the charcoal canister storage method. This method transfers fuel vapor from the fuel tank to an activated carbon (charcoal) storage device (canister) to hold the vapors when the vehicle is not operating. When the engine is operating, the fuel vapor is purged from the carbon element by intake air flow and consumed in the normal combustion process. The evaporative system includes the following components: *Fuel tank *Evaporative emission canister vent solenoid *Fuel tank pressure sensor *Fuel pipes and hoses *Vapor lines *Fuel cap *Evaporative emission canister *Purge lines *Purge valve solenoid EVAP System Operation: The EVAP purge solenoid valve allows manifold vacuum to purge the canister. The Powertrain Control Module (PCM) supplies a ground to energize the EVAP purge solenoid valve (purge on). The EVAP purge solenoid control is Pulse Width Modulated (PWM) or turned on and off several times a second. The EVAP canister purge PWM duty cycle varies according to the operating conditions determined by the mass air flow, the fuel trim, the engine coolant temperature, and the intake air temperature. For certain EVAP tests, the diagnostic will be disabled if the TP angle increases to above 75% . The evaporative leak detection diagnostic strategy is based on applying vacuum to the EVAP system and monitoring for vacuum decay. The fuel level sensor input to the PCM is used to determine if the fuel level in the tank is correct to run the EVAP diagnostic tests. To ensure sufficient volume in the tank to begin the various diagnostic tests, the fuel level must be between 15% and 85% . The PCM monitors the fuel tank pressure/vacuum level via the fuel tank pressure sensor input. Results of Incorrect Operation: Poor idle, stalling and poor driveability can be caused by the following: *Malfunctioning purge solenoid. *Damaged canister. *Hoses/lines split, cracked and/or not connected properly. Evidence of fuel loss or fuel vapor odor can be caused by the following: *Liquid fuel leaking from the fuel lines *Cracked or damaged canister *Inoperative canister control valve Vacuum hoses that are: *Disconnected *Mis-routed *Kinked *Deteriorated *Damaged The evaporative leak detection diagnostic strategy is based on applying vacuum to the EVAP system and monitoring vacuum decay. The PCM monitors vacuum level via the fuel tank pressure sensor input. At an appropriate time, the EVAP purge solenoid and the EVAP vent solenoid are turned on, allowing engine vacuum to draw a small vacuum on the entire evaporative emission system. After the desired vacuum level has been achieved, the EVAP purge solenoid is turned off, sealing the system. A leak is detected by monitoring for a decrease in vacuum level over a given time period, all other variables remaining constant. A small leak in the system causes DTC P0442 to be set. If the desired vacuum level cannot be achieved in the test described above, a large leak or a faulty EVAP purge solenoid is indicated. This can be caused by the following conditions: *Disconnected or faulty fuel tank pressure sensor. *Missing or faulty fuel cap. *Disconnected, damaged, pinched, or blocked EVAP purge line. *Disconnected or damaged EVAP vent hose. *Disconnected, damaged, pinched, or blocked fuel tank vapor line. *Disconnected or faulty EVAP canister solenoid. *Disconnected or faulty EVAP vent solenoid. *Open ignition feed circuit to the EVAP vent or purge solenoid. *Damaged EVAP canister. Any of the above conditions sets DTC P0440. A restricted or blocked EVAP canister vent path is detected by drawing vacuum into the EVAP system. The PCM turns off the EVAP vent solenoid and the EVAP purge solenoid (EVAP vent solenoid Open, EVAP purge PWM 0% ). The PCM monitors the fuel tank pressure sensor input. With the EVAP vent solenoid open, any vacuum in the system should decrease quickly unless the vent is blocked. A blockage is caused by the following conditions: *Faulty EVAP vent solenoid (stuck closed). *Plugged, kinked, or pinched vent hose. *Shorted EVAP vent solenoid driver circuit. *Plugged evaporative canister.

Good luck shoretex, hope this helps...please take time to rate me a fixya.

Jul 20, 2009 | 2001 Dodge Dakota

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