For 2003-2006 GMC C4500 Topkick HVAC Heater Control Valve 4 Seasons 2004 2005

2003 GMC C4500 Topkick OE No. 15070012; Heater Valve w/ Auxiliary Heater (Shut-Off Valve);. 2004 GMC C4500 Topkick OE No. 15070012; Heater Valve w/ Auxiliary Heater (Shut-Off Valve);. 2005 GMC C4500 Topkick OE No. 15070012; Heater Valve w/ Auxiliary Heater (Shut-Off Valve);.