1.Product Description

FAW J6 Lower Radiator Hose 1303021-74A Truck Cooling System Parts

In heavy-duty FAW J6 transportation, mining and construction operations, the lower radiator hose serves as a critical coolant transfer component connecting the radiator outlet to the engine cooling circuit. Although simple in appearance, it directly affects coolant circulation efficiency, engine temperature stability and overall vehicle reliability.

When the lower radiator hose begins to deteriorate, it can trigger a costly chain reaction throughout the cooling system.

Phase 1: Rubber Aging

Continuous exposure to engine heat gradually hardens the rubber material and reduces elasticity.

Phase 2: Surface Cracking

Temperature cycling, vibration and environmental exposure create micro-cracks on the hose surface.

Phase 3: Internal Layer Separation

Coolant pressure and aging weaken the internal reinforcement layers.

Phase 4: Coolant Leakage

Leaks begin around bends, clamp positions or weakened sections of the hose.

Phase 5: Engine Overheating

Sudden hose rupture causes rapid coolant loss, resulting in severe overheating and potential engine damage.

Critical Fleet Impact

For fleet operators, a failed lower radiator hose does not simply require a hose replacement. It may cause roadside breakdowns, overheating incidents, cylinder head damage, lost transport revenue and expensive emergency repairs.

2.Technical Parameters

3.Fitment Problem — Make Sure It Works

Fitment Models

(1) How to verify part's fitment?

Lower radiator hoses often appear visually similar while having different diameters, lengths and bend angles. Installing the wrong hose may cause leakage, improper fitment or premature failure.

Checks Before Purchase

[ ] OEM Number: 1303021-74A

[ ] Vehicle VIN Number

[ ] Vehicle Model

[ ] Original Hose Photo

[ ] Hose Diameter

[ ] Hose Length

[ ] Hose Bend Angle

[ ] Radiator Outlet Size

[ ] Engine Water Inlet Size

[ ] Chassis Information

(2) OEM Cross Verification

4.Common Field Failure Case

(1) Case Study Item

(2) Smart Buying Guide (Don't Waste Money on Wrong Repairs)

Table A: Symptom Recognition — Cooling Hose Failure Logic

Table B: Misdiagnosis Risk — Stop Changing the Wrong Parts!

Table C: Fake vs. Premium Heavy-Duty Identification

5.Risk Control —— Make sure everything goes well

6.Supplier Stability and Procurement Value —— Make More Profit in Your Market.

7.Related Truck Parts —— Buy More, Save More, Earn More Profit!

Contact Information

Your Direct Contact: William Du (Senior Export Sales Manager)

Heavy Truck Aftermarket Fitment & Supply Chain Specialist

Our Expertise: Full Supply Chain for SINOTRUK | SHACMAN | FAW | FOTON | WEICHAI Heavy Truck Spare Parts

WhatsApp / WeChat: +86 19050562894

Business Email: Sales22@chinatruck.cc

Export Platform: Chinatruck.cc

1303021-74A is consistently identified in parts catalogs and distributor listings as the lower radiator hose for FAW J6 applications. Some catalogs additionally describe it as a D=70 curved lower radiator hose.