AG803 HEATER CONTROL VALVE — NOS — GM / UNIVERSAL — AC DELCO 15-5103 CROSS
type: Unknown Type
Vendor: CorvairFarmer
Description:
🧰 AG803 — HEATER CONTROL VALVE — SPECIFICATIONS & CROSS-REFERENCE
🔧 Technical Specifications
| Attribute | Details |
|---|---|
| Part Number | AG803 |
| Type | Inline Heater Control Valve |
| Function | Regulates coolant flow to heater core |
| Operation | Manual or vacuum-actuated (application dependent) |
| Inlet/Outlet Size | 5/8" hose (typical) |
| Material | Metal body with rubber seals |
| Temperature Range | –40°F to 175°F (–40°C to 79°C) |
| Mounting | Inline hose clamp or bracket mount |
| Status | NOS / aftermarket legacy part |
🔁 Cross-Reference Equivalents
| Brand | Equivalent Part Number |
|---|---|
| AC Delco | 15-5103 |
| Murray | 277603 |
| Everco | H2391 (likely match) |
| Other AG Boxes | AG170 (same Delco number), AG605/AG606 (adjacent family) |
🚗 Common Applications
-
GM: 1970s–1980s Chevy, Buick, Oldsmobile, Pontiac, GMC
-
Universal: Inline heater hose control for aftermarket HVAC installs
-
Retrofit: Used in custom or restoration setups where vacuum or manual coolant shutoff is needed
