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Hello,
The Brass and Orange Bakelite cylinder with two Vacuum Nipples under Intake Manifold, ahead of Temp Sender is a Temperature Controlled Vacuum Valve. I think Cold, it should be Closed and Hot Opened. Nipple on outer goes to Inlet Manifold and the Inner goes to fitting on Air Box Ducting just behind Venturi, according to one drawing I have for Continuous Type, those cars with Automatic Transmissions and Carburettors. I do not have any detailed drawing for FI engines. Could ask Volvo Service Department for a peek at theirs.
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