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OK, had time to look at my car's set up again.
There is a vac hose from the CBV that runs over the cam cover through a one-way check valve and into the top of the TB (The larger "S" shaped hose fro the "Y" connector goes, not to the CBV, but to the intake pipe infront of it)
There also is a vac hose coming of the TB and runs through the firewall in front of the driver. Not certain, but it probably supplies vacuum to the HVAC system interior air flow managemnt
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'Can't understand why people abort Volvos, either' '89 740 Turbo, 122,000 miles
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