Engineered to Deliver Reliable Coolant Distribution

Coolant flanges play a vital role within the engine cooling system, providing secure connection points between the engine, coolant hoses and auxiliary cooling components. Acting as a junction for coolant flow, they help ensure coolant is distributed efficiently throughout the system to maintain stable operating temperatures and protect the engine from overheating.

Modern coolant flanges often incorporate additional features including temperature sensors, bleed valves and multiple hose outlets, making them an increasingly important component within today's cooling systems. Manufactured from high-quality materials and engineered for dependable sealing performance, Serck coolant flanges are designed to provide reliable coolant management and long service life across a wide range of passenger car and light commercial vehicle applications.

Coolant Flange 142

StockASSIST: Our Most Popular Coolant Flanges for the UK Aftermarket

Coolant flanges are a common replacement item on many modern vehicles, particularly as plastic components age and become brittle through repeated heat cycles. Failures frequently result in coolant leaks that require immediate repair, making coolant flanges an important stock line for factors supporting independent workshops.
StockASSIST helps identify the coolant flange applications most commonly required across the UK vehicle parc, ensuring the right products are available when customers need them.

Coolant Flange 142

CCH0142

Serck Coolant Flange

Coolant Flange 157

CCH0157

Serck Coolant Flange

Coolant Flange 177

CCH0177

Serck Coolant Flange

Coolant Flange 122

CCH0122

Serck Coolant Flange

CCH0082

Serck Coolant Flange

Coolant Flange 72

CCH0072

Serck Coolant Flange

Coolant Flange 66

CCH0066

Serck Coolant Flange

Coolant Flange 29

CCH0029

Serck Coolant Flange

Coolant Flange 118

CCH0109

Serck Coolant Flange

Coolant Flange 151

CCH0151

Serck Coolant Flange

TechASSIST: Product Support and Information

The coolant flange forms an important connection point within the cooling system. It: • Directs coolant flow between the engine and cooling system components • Provides secure mounting points for coolant hoses • Maintains a leak-free seal between cooling system components • Supports stable engine operating temperatures • May incorporate coolant temperature sensors or bleed valves • Helps ensure efficient coolant circulation throughout the vehicle Although often overlooked, a damaged coolant flange can quickly lead to coolant loss, overheating and costly engine damage if not addressed promptly.

Why Do They Fail?

Coolant flanges operate in a harsh environment and commonly fail due to:

  • Plastic degradation caused by repeated heating and cooling cycles
  • Cracking around hose connections or mounting points
  • Gasket or seal deterioration allowing coolant leaks
  • Excessive cooling system pressure
  • Corrosion on metal-bodied variants
  • Damage during hose removal or previous repairs
  • Failure of integrated temperature sensors where fitted

Symptoms of a Failing Coolant Flange

  • Visible coolant leaks around the engine
  • Coolant smell from the engine bay
  • Low coolant warning light illuminated
  • Frequent coolant top-ups required
  • Engine overheating
  • White or coloured coolant residue around hose connections
  • Temperature gauge irregularities on sensor-equipped units
  • Engine management fault codes where integrated sensors have failed

Fitting Tips

  • Always replace seals, O-rings and gaskets supplied with the flange
  • Inspect connected hoses for signs of swelling, cracking or deterioration
  • Clean mating surfaces thoroughly before installation
  • Avoid over tightening mounting bolts, particularly on plastic flanges
  • Check operation of any integrated temperature sensors before completing the repair
  • Refill and bleed the cooling system according to manufacturer procedures
  • Verify there are no leaks once the engine reaches operating temperature