CAR Expansion Tank Cap

Coolant reservoir cap: common defects and their signs

  1. Corrosion and clogging of the cap valve.
    • Efficiency of cooling system operation decreases.
    • Level of cooling liquid in the expansion tank lowers.
    • Smoke appears from under the hood.
    • Coolant hoses are deformed.
    • Smell of antifreeze is noticeable in the car passenger compartment.
  2. Valve jamming.
    • Stains of antifreeze appear on coupling elements of the cooling system.
    • Boiling of cooling liquid occurs.
    • Antifreeze in the expansion tank quickly grows dark and cloudy.
    • The expansion tank may inflate or blow up.
  3. Spring wear.
    • Pressure in the cooling system increases.
    • The passenger compartment warms up insufficiently during cold season.
    • Antifreeze consumption increases.

How to replace coolant reservoir cap?

Manufacturers don’t indicate a specific lifetime limit for the coolant reservoir cap, so it is necessary to regularly check the component for mechanical damages. The part is not repairable, so it should be immediately replaced if any defect signs are found.

Procedure of car component replacement is quite simple, even a young driver can do it. One should be scrupulous about choosing a new component: the value of pressure at which the cap valve activates should strictly correspond to the same parameter of the broken-down part.

Basic sequence of steps for coolant reservoir cap replacement for any car is:

  1. Open the bonnet.
  2. Carefully unscrew the coolant reservoir cap.
  3. Clean the mounting seat of the cap.
  4. Install a new component and tighten it securely.

The work should only be performed after the engine cools down.

Expansion Tank Cap Information

Expansion Tank Cap: Bestsellers

-20%
TOPRAN Sealing Cap, coolant tank
Article № : 111 023
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£ 3,64
£ 2,91
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  • Material: Plastic
  • Colour: Blue
  • Mounting Type: Screw Connection

OEM-Number

3B 01 2 132 1

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FEBI BILSTEIN Sealing Cap, coolant tank
Article № : 14700
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  • Switch point from [bar]: 1,4
  • Switch point to [bar]: 1,6
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OEM-Number

1J 01 2 132 1B

1J 01 2 132 1A

1J 01 2 132 1

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BLUE PRINT Sealing Cap, coolant tank
Article № : ADC49902
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  • Opening Pressure [bar]: 0,9
  • Weight [kg]: 0,050

OEM-Number

25 33 0 170 00

MB 66 0 735

0K 20 2 152 05A

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TOPRAN Sealing Cap, coolant tank
Article № : 720 173
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  • Opening Pressure [bar]: 1,4
  • Outer diameter [mm]: 60
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OEM-Number

13 06 E 4

96 38 0 012 80

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JP GROUP Sealing Cap, coolant tank
Article № : 1114800300
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  • Thickness [mm]: 32
  • Outer diameter [mm]: 87
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TOPRAN Sealing Cap, coolant tank
Article № : 202 261
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£ 1,57
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  • Material: Plastic
  • Mounting Type: Screw Connection
  • Thread Type: Inner Thread

OEM-Number

86 FB 8 100 GD

90 46 7 473

72 67 9 69

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TOPRAN Sealing Cap, coolant tank
Article № : 500 343
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  • Opening Pressure [bar]: 2,0
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OEM-Number

17 11 1 742 231

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FEBI BILSTEIN Sealing Cap, coolant tank
Article № : 37600
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  • Shifting Points [bar]: 1,4
  • Mounting Type: Screw Connection
  • Weight [kg]: 0,04

OEM-Number

13 06 J 5

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