Keep hot coolant moving to your cabin's heater core with the Gates HVAC Heater Hose 51394, a direct-fit replacement for the 2013-2019 Cadillac ATS. This is the heater inlet hose that carries engine coolant on the heater-to-pipe run, feeding the heater core so your climate system can draw warmth from the coolant loop.
- Position: Cataloged for the heater-to-pipe, heater inlet routing — it connects the heater to the coolant pipe on the inlet side.
- Job: Carries pressurized engine coolant between the cooling system and the heater core.
- Application: A direct-fit replacement for the listed application.
Over time a heater hose can crack, harden, swell, or weep at the connections. If a failed or leaking heater hose is the cause of coolant loss, damp carpet, a sweet coolant smell, or weak cabin heat, this hose replaces it — always diagnose the source of a leak before replacing. Inspect the clamps and connections during installation and top off the cooling system afterward.
Interchange: 20800S · F10363 · 22799462
Manufacturer part number 51394.
This part cross-references / interchanges with the following part numbers:
Frequently Asked Questions
What vehicle does this heater hose fit?
It's a direct-fit replacement for the 2013-2019 Cadillac ATS. Check the Buyer's Guide tab to confirm it matches your exact vehicle.
Where does this hose go on the vehicle?
It's cataloged for the heater-to-pipe, heater inlet routing, connecting the heater to the coolant pipe on the inlet side.
What does a heater hose do?
It carries engine coolant between the cooling system and the heater core, so the HVAC system can use that coolant's heat to warm the cabin.
What are signs this hose may need replacing?
Coolant leaks or weeping at the connections, cracked, hardened, or swollen hose, low coolant, a sweet smell, or weak cabin heat. Diagnose the leak source before replacing.
What interchange numbers does this hose replace?
It cross-references 20800S, F10363, and 22799462. The manufacturer part number is 51394.
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