Thermo Valve boost leak advice

Talk and Tech about turbocharged 924/944/968 cars
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Spencan
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I have been chasing boost leaks for a while now. I rebuilt the throttle body (thanks Tom!), replaced some cheap aftermarket Intercooler clamps, and replaced the original ISV hoses.

Now when I pressurize my intake system, I can hear air coming from the thermo valve under the intake. I connected a handheld vacuum pump to the tube that connects to the intake and it holds 18 psi with no leaking. When I connect the pump to the other side of the thermo valve (to the evaporator system side) it does not hold any vacuum. I did this with the engine cold. Do have the lines mixed up or do I need a new thermo valve?
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'89 Turbo S-Glacier Metallic Mods: Evergreen Turbo-"Raptor" stage II, Bell custom intercooler, FTech 9 DME & OBD+, Tial 38 Wastegate, GFB EBC, A-Tune, 3" Turbo Back Exhaust, Cross-Drilled rotors, refreshed suspension

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