No, it doesn't need to be fully dry, and it doesn't have enough lift to pull the dregs of fluid from the bottom of the radiator to the top. A relatively minor gripe, considering I do not expect to use the tool daily. So, the nipple needs to be removed for storage and reinstalled when the tool needs to be used. When the threaded compressor adapter (nipple) is fitted to the tool and the tool placed in the storage case, the nipple protrudes upwards and prevents the case from closing. One negative observation arose from cleanup. While I may have lacked the acuity to properly use the tool, it seems like it performed as expected. Let the car sit overnight and no visible leaks remained. When the first jug was empty, I moved the intake into the next jug, recharged the vacuum, and drained another bottle of coolant. Closing the compressor valve and releasing the coolant intake valve caused the cooling system to drain a jug of coolant.

The intake filter fits into a standard coolant jug, but it seemed like the intake filter diameter was too large to fit into a standard gallon water jug. Regardless of my inability to use the tool properly, I was able to pull a vacuum on the cooling system, and dunked the intake hose into the coolant bottle. I realized after I disconnected the tool that may be the purpose of the small hook affixed to the top of the device. Upon reflection, it seems the weight of the attached compressor hose would pull the device slightly ajar, breaking the seal with the reservoir. I experienced some trouble when trying to hold a vacuum with the device. Anodized aluminum seems better than steel in this application because it may have less reactivity with ethylene glycol (and variants).

The tool core, which is tightened to seal the device to the vehicle and act as an orifice to deliver fluid, appears to be made of anodized aluminum. The rubber adapters are soft and malleable, which I expect means that they are made from sufficient quality rubber. The 6 rubber grommets included are various sizes, and designed to fit into the coolant reservoir. The device is heavy, and seems like it's made from dense polymer. The tool seems robust, like it may withstand moderate impact. I had some difficulty getting a proper seal on the reservoir, but it doesn't seem like that's a tool deficiency. Since I split the tanks, I also purged the upper inter cooler hose as well, although the electric pump in that system can usually push a little air pocket out without issue, it still seemed like a good idea.Ī Vaccum filler does work awesome in everything else I've used one on, but the one I have doesn't have the right cap adapter for the smaller rzr cap, could probably find one fairly easily I would think tho.I appreciate that HF made this tool! I needed it to test and fill my N63 (550i). After two purges mine seems to be working perfectly. Raise the front of the machine up a couple feet, pull the upper thermostat hose, purge the air, replace the hose, top the coolant off, and the let it idle up to temp, when the fan kicks on, the temp should go down, if it doesn't, repeat the process. I was a little skeptical, but it seems to have worked great and is FAR easier than using the factory bleed screw, you can get to it without taking anything off really. I just installed the above mentioned split tank, and in their instructions they bleed the air at the upper thermostat hose.

Uview vacuum coolant filler