RX-3N1 vs Flo-Dynamics C-VAC3: Coolant Exchange Machine Comparison

This RX-3N1 vs Flo-Dynamics C-VAC3 comparison covers power source, capacity, weight, and EV coolant compatibility, based on each manufacturer’s published specifications.

RX-3N1 vs Flo-Dynamics C-VAC3: Head-to-Head

	RX-3N1	C-VAC3
Power source	Shop air	12V DC and shop air
Maximum pressure	90 PSI	Not publicly listed
Exchange time	7 minutes, up to 95% fluid removed via push-pull	Not publicly listed
New fluid capacity	5.0 gal	14 gal (two 7-gallon tanks)
Old fluid capacity	5.0 gal	8 gal
Weight	78 lbs	159 lbs
Dimensions	22″D x 19″W x 54.5″H	27″D x 23″W x 52″H
Construction	Not publicly listed	Not publicly listed
EV coolant compatibility	✓ Built-in pressure regulator, no add-on needed	✗ Requires optional Pressure Reducer accessory (#40100154)
Warranty	1 year	Not publicly disclosed

Sources: RX-3N1 specs from Engine Clean’s own product documentation. C-VAC3 specs from Flo-Dynamics’ published product page. For general guidance on flush intervals, see Vehicle Service Pros’ guide to coolant flush intervals.

Why the Single-Tube Exchange Design Matters

Both machines handle drain-and-fill, inline flush, and full exchange — the difference is how. The C-VAC3 does it with larger tanks and a heavier frame, and needs both a 12V DC connection and shop air to run. The RX-3N1 does the same range of jobs through a single tube, running on shop air alone — no second power system to wire up or maintain. Fewer connection points also means less that can leak or fail, and at 78 lbs it’s far easier to move between bays than the C-VAC3’s 159 lbs.

Running entirely on shop air also means the RX-3N1 doesn’t need a 12V DC connection in addition to your air line — one utility instead of two.

The RX-3N1’s push-pull feature also removes up to 95% of old fluid, well above what a simple drain-and-fill achieves. EV coolant systems run at different pressures than conventional cooling systems, and the C-VAC3 needs a separate optional Pressure Reducer accessory to handle them. The RX-3N1’s pressure regulator is built into the machine, so there’s no extra part to buy, track, or forget to attach before servicing an EV.

Family-Owned, and It Shows

Engine Clean has been family-owned since 1989, but that doesn’t mean we’re stuck in our ways. We’re tech-forward and run the same modern tools and professional support infrastructure you’d expect from a large company — we just don’t have the layers that come with one. When you call us, you get a real person, and that person can actually fix your problem, not a case number in a queue at a public company or a private-equity-owned brand. If something goes wrong with your RX-3N1, one call or email gets you a direct answer.

This comparison uses publicly published specifications as of 2026-09. Specs and pricing change — verify current details directly with each manufacturer before purchasing. Engine Clean is not affiliated with or endorsed by Flo-Dynamics.