G37, Q50, VQ37VHR

How To Replace G37 / Q50 Heater Hose Connector VQ37VHR

How To Replace G37 / Q50 Heater Hose Connector VQ37VHR

Gurgen Akopyan |

Replacing the heater hose connector on a VQ37VHR engine (G37 or Q50) is a crucial maintenance task, as the plastic OEM connectors are known to corrode and break over time. Here is a step-by-step guide based on the video:

Preparation

  • Safety First: Ensure the engine is cool before starting any work on the cooling system.

  • Tools Needed: Pliers, vice grips, a bucket, and a coolant funnel/bleeder cup.

  • Parts: A new heater hose connector (readily available at Nissan/Infiniti parts departments).

Step 1: Access the Connector

  • Remove the plastic engine cover to get a clear view of the heater hoses at the back of the engine bay [00:15].

  • Place a bucket underneath the car to catch any coolant that spills when the hoses are disconnected [00:28].

Step 2: Remove the Old Connector

  • Use pliers to slide the hose clamps back away from the connector [00:56].

  • Pro Tip: Use vice grips to squeeze the hose before pulling the connector out. This prevents broken plastic fragments from falling deep into the hose and entering your engine [01:21].

  • Carefully pull the hoses off the old connector. These often break or crumble during removal due to heat cycles and corrosion [01:09].

Step 3: Install the New Connector

  • Slide the new connector into the hoses.

  • Safety Warning: If you are using pre-loaded clamps, be extremely careful. They are under high tension and can cause injury if they snap shut unexpectedly [02:32].

  • Position the clamps over the connector ends and release them to secure the hoses [03:16].

Step 4: Bleed the Cooling System

  • Attach a cooling system funnel (bleeder cup) to the radiator or bleeder port to refill the system [03:20].

  • Fill the system with the appropriate coolant until full.

  • Start the engine and turn the heater to full blast (set to both face and floor vents) to ensure coolant circulates through the heater core [03:37].

  • Allow the engine to run and watch for air bubbles escaping through the funnel until the system is fully bled [03:44].

Step 5: Final Check

  • Once the air is out of the system, remove the funnel and replace the radiator cap.

  • Reinstall the engine cover.

You can find the video here: https://youtu.be/bPqpVkyKNq0

 

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