Sonnax developed the SonnaFlow® diagnostic kit for measuring ATF flow rates. This tool measures cooler flow in gallons per minute, and can also be connected to a lab scope or used with a dynamometer. The SonnaFlow® verifies cooler flow under actual driving conditions and can even measure cooler flow during vehicle road tests. This unit allows you to detect a blocked cooler flow circuit as well as weak pumps and more.
The SonnaFlow® kit FM-01KA includes a meter with large display numbers and a low-flow warning light, technical manual, all the necessary brass fittings, a detachable power cord and 12-foot insulated signal cable, durable electrical connectors and 12V power adapter. The SonnaFlow® meter is spliced into the return line from the radiator to the transmission case, and should be removed after testing. The SonnaFlow® is not meant for permanent installation or for prolonged use. It can be installed in any vehicle, whether the cooler return line is made of rubber or metal (metal return lines require a separate adapter). The power cord connects to the cigarette adapter or can be modified for direct connection to the fuse box or to the battery.
Updated technical manual charts are available online.
