Heating and Air Conditioning
Heater Core Hoses
Heater To Valve (Upper) - Molded Heater Hose; 5/8" x 34 13/32"
GATES Part # 19198
NAPA NBH 11198
Heater To Valve (Lower) - Molded Heater Hose; 3/4" x 30 11/16"
GATES Part # 19761
NAPA NBH 11761
Blower Motor Resistor
ACDELCO Part # 1580550 {#12135105, 158618, 89018436}
Blower Motor / AC Condenser Cover
1996-2005 vans the Blower Motor / AC Condenser Case is enclosed by a plastic cover. In the factory service manual it is referenced as an Acoustic Cover. In the parts catalog it is called an Insulator. With age these are prone to get brittle and easily crack and break apart.
Inlet side (covering the blower):ACDelco 52478147 Insulator
Outlet side: ACDelco 52471300 Insulator
Most important is the case under the brittle cover, should this break it will allow air from the engine bay into the HVAC system.
Inlet side: ACDelco 52478146 Case
Outlet side: ACDelco 52468396 Case
Gasket: ACDelco 52468394
All of these parts are no longer available from GM. As of this edit (2017-12-20) internet search engines were unable to find them available from aftermarket companies.