21430C991A Nissan CAP ASSY-FILLER, Price: 9.63$, Weight: 0.02kg


Make Number Name Availability Weight, kg Ship in, Days Price

Nissan

21430C991A

CAP ASSY-FILLER

414

0.02

2-3

9.63$

 

Originals

Make Number Name Availability Weight, kg Processing, days Price  
Nissan
21430C991A 
CAP ASSY-FILLER
306
0.023
 Dispatch 24h
11.02$
 

Compatibility

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Radiator Filler Cap β€” OE-Grade Cooling System Seal

Keep your engine safe from heat stress with this precision filler cap. It locks in the correct pressure so coolant circulates efficiently, raises the boiling point, and prevents evaporation. A healthy cap protects the head gasket, radiator, and hoses, and keeps your heater working on cold mornings ❄️.

Why it’s needed

Engines create heat. The cooling system must hold set pressure to move coolant and stop it from boiling. This cap is the gatekeeper: seal, regulate, and stabilize. Simple part, huge protection.

How it works

A spring‑loaded pressure valve keeps system pressure within spec. When pressure rises, the valve vents excess to the overflow tank. On cool‑down, the vacuum valve draws coolant back, preventing air pockets. Durable gasket and seat ensure a tight, leak‑free seal .

If the cap fails

Expect overheating, coolant loss, weak cabin heat, collapsed hoses, hard starts after heat‑soak, and possible warped head or pump cavitation. You may see bubbles in the reservoir or smell sweet coolant. Replace at the first sign of a weak spring, cracked gasket, or staining around the neck ⚠️.

Compatibility

  • Q50
  • Q70/M
  • Qx50/Ex
  • Q70(201802-)Lam
  • Q60/G Coupe
  • Qx80/Qx56
  • Qx70/Fx