CHICAGO — Four-way reversing valves are at the heart of heat pump systems, and are indeed necessary to their function. An American Society of Heating, Refrigerating and Air-Conditioning Engineers Inc.

These kits are offered for vintage four-speed and Richmond transmissions ... If the rod remains partially depressed when the clutch pedal is at rest, the one-way valve in the master will suck ...

The goal is faster launches, more consistent performance, and reduced clutch wear. Ducati has always stood at the crossroads ...

To finish the job they were working on last week (see "Btu Buddy 24: Looking At A Heat Pump Drawing A Lot Of Power"), Bob meets Btu Buddy at the jobsite to change the heat pump's four-way valve on a ...