Always make sure you have the right machine for the job, R134 and R1234YF do not mix !
Check the available weight in your recovery tank before you start a recovery, make sure you have room to recover the refrigerant without filling the tank. Once the tank is full your only choices are to vacuum and charge a vehicle, or bring it to us to remove refrigerant from the tank. Venting to the atmosphere is illegal.
If you are not sure always use a sealant tester to make sure there is no sealant in the vehicle you are recovering. Sealant detection kits are available from your Snap on or Mac Tools dealer. Sealant inside an A/C recovery unit will automatically void any warranty you have left, it will also be a very expensive repair with no warranty at all. We take every precaution that we can, flush the manifolds and solenoids with brake clean but rarely manage to get all of it in a single repair. It is very time consuming and on an older recovery unit can write it off.
While many units are advertised as being able to independantly recover a vehicle it is always a good idea to check on the unit every 10 minutes or so. Most units are designed to shut down the recovery when the system has been pulled into a vacuum of about 10" HG. If the system has a leak it may never get to that vacuum level, this means the unit will continue to recover but will be pulling air (through the leak, through the system) into it's internal tank. Eventually when the pressure gets to 450 psi the unit will shut down with a "High Pressure Error". If this happens to you let the recovery unit sit for about 30 minutes, as it cools down the pressure will drop and may allow you to run a vacuum (not connected to any vehicle). The vacuum mode also runs a tank purge to remove excess air from the internal tank, and may repair the problem for you.
Unfortunately there are also some internal failures that will cause a high pressure error, if the error re-occurs immediately, you should contact us for repair.