911 Turbo AWD F6-3600cc 3.6L SOHC Twin Turbo (1997)
Air Bypass Valve: Service and Repair
1. Disconnect battery.
2. Remove air guide frame from charge air cooler.
3. Remove charge air cooler.
NOTE:
a. Do not drop the rear square fastening nuts of the lower charge air cooler bracket after loosening them.
b. Plug-seal the pressure pipes between charge air cooler and turbocharger (foreign substances).
4. Remove hot air blower and recirculating air flap.
5. Remove air cleaner assembly and hot-film mass air sensor.
6. Remove right-hand recirculating-air valve (A), loosen two hose clamps and vacuum hose.
Recirculating Air Valve
7. Remove left-hand recirculating-air valve (B), loosen two hose clamps and vacuum hose.
NOTE: First loosen hose clamp at intake pipe and remove valve with hose. Before installation, fit hose to valve.