All 9-5 owners in the US market know the Coolant By-Pass Valve is a failure prone part. Although I had a spare valve in my trunk, I felt the likelihood it would fail in my driveway on a warm sunny day for a second time was pretty low. So to prevent the possibility of a roadside breakdown I decided to completely eliminate the valve by installing the european heater hose kit.
The part you need to do this exchange is #54-63-252 It is normally sold in the US by eEuroparts, RM European, saabpartsonline.com (Flow Saab out of Winston-Salem NC), Jim Ellis Saab's on line ordering system (Atlanta GA), and maybe a few other sources.
You will also need four new hose clamps; one 1-inch, two 1-1/8 inch, and one 1-3/8 inch. You can always re-use the old double tang style but most owners prefer to install worm gear style clamps.
You will need to remove the old Coolant by-Pass Valve and the three hoses connecting the engine to the CBV/heater core. Four additional hose clamps need to be removed, two of these additional hose connections are on the firewall, one on the firewall side of the engine beneath the thermostat, and the largest one on the end of the engine below the temperature sensor.
In addition you must disconnect the vacuum hoses from the solenoid valve to prevent vacuum leaks, BUT you must leave the solenoid valve electrically connected to the car's wiring harness. Disconnecting the solenoid electrically will cause lots of error codes from the detection of an open circuit by one of the many on-board computers. To disconnect the vacuum lines remove the Tee feeding vacuum to the solenoid, and replace it with a straight barbed fitting.
After eliminating these parts and replacing them with a $30 to $38 european heater hose kit; I now never have to worry about my CBV failing, I now never have to worry about my 12 year old heater hoses with 307,000 miles of use failing, and I spent less than the cost of a new CBV!