Quote Originally Posted by Kent_P View Post
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4. I followed the bleeding procedure as outlined in the RAVE - is there anything else I should be doing in addition?
IMO a good practice is that after the RAVE procedure is done refit only partially the bleed screw, start the engine and ask somebody to keep it throttled constantly above 1500rpm untill no bubbles are coming out near the bleed screw then tighten it completely and you can consider it airless, the gist of this trick lays in the description of the thermostat(you'll see what i mean):
Quote Originally Posted by COOLING SYSTEM - TD5; DESCRIPTION AND OPERATION 26-1-5
By-pass flow valve

The by-pass flow valve is held closed by a light spring. It operates to further aid heater warm-up. When the main valve
is closed and the engine speed is below 1500 rev/min, the coolant pump does not produce sufficient flow and pressure
to open the valve. In this condition the valve prevents coolant circulating through the by-pass circuit and forces the
coolant through the heater matrix only. This provides a higher flow of warm coolant through the heater matrix to
improve passenger comfort in cold conditions.

When the engine speed increases above 1500 rev/min the coolant pump produces a greater flow and pressure than
the heater circuit can take. The pressure acts on the flow valve and overcomes the valve spring pressure, opening
the valve and limiting the pressure in the heater circuit. The valve modulates to provide maximum coolant flow through
the heater matrix and yet allowing excess coolant to flow into the by-pass circuit to provide the engines cooling needs
at higher engine rev/min.