Information - Expansion tank cap

Cooling fluid reservoir cap: replacement and selection

When and why it is necessary to replace cooling fluid reservoir cap

Manufacturers do not specify exact operational lifetime for the cooling fluid reservoir cap. Replacement of the part is performed at appearance of cracks on it or at breakage. Moreover, a new cap is installed at valve jamming.

Mechanical damages of the component appear as a result of a road accident. The cause of valve jamming lies in its clogging. Particularly, this is possible, at appearance of emulsion in cooling fluid due to ingress of oil.

Presence of cap defect is indicated by leakage of working fluid from the reservoir, which is noticeable because of specific smell in the passenger compartment. Also leakages under the radiator or smoke from under the bonnet can appear.

During replacement of the cooling fluid reservoir cap you need to take into account, that it can be opened only at turned off and cooled engine.

Cooling fluid circulates under the pressure and have high temperature, that is why there is a risk to sustain a burn wound if safety precautions are not observed. It is worth remembering that untimely replacement of the part can lead to improper functioning of the cooling system, which is fraught with engine breakdown.

How to select cooling fluid reservoir cap

The items differ from one another by construction. Thus, there are caps with two valves: safety (releases high pressure) and vacuum (normalizes low pressure). Also there are parts with one valve, which performs both functions noted above.

High-quality expansion tank caps are presented in the assortment of many brands. The most famous are Metzger, AKS DASIS, Swag, Gates, Topran, Vaico.

The items diverge from one another by shape, valve diameter, height and thread size. Moreover, maximum allowed pressure is noted for the components and it depends on the type of the radiator installed.

Expansion tank cap at low cost: Top Spares

Sealing Cap, coolant tank (FEBI BILSTEIN, 12205) -21%
Sealing Cap, coolant tank | FEBI BILSTEIN 12205 Article №: 12205
FEBI BILSTEIN Sealing Cap, coolant tank 12205
£ 5,99
£ 4,73
incl. 20% VAT, Shipping
Over 100 items in stock
  • Opening Pressure [bar] 1,4
  • Weight [kg] 0,057
  • Condition  New
Details
Sealing Cap, coolant tank (CALORSTAT by Vernet, RC0008) -21%
Sealing Cap, coolant tank | CALORSTAT by Vernet RC0008 Article №: RC0008
CALORSTAT by Vernet Sealing Cap, coolant tank RC0008
£ 4,49
£ 3,55
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Over 100 items in stock
  • Pressure [bar] 1,2
  • Condition  New
Details
Sealing Cap, coolant tank Manual Transmission for left-hand drive vehicles Europe (MAXGEAR, 28-0369) -21%
Sealing Cap, coolant tank | MAXGEAR 28-0369 Article №: 28-0369
MAXGEAR Sealing Cap, coolant tank 28-0369
£ 3,99
£ 3,15
incl. 20% VAT, Shipping
Over 100 items in stock
  • Opening Pressure [bar] 0,9
  • Required quantity 1
  • Weight [kg] 0,050
  • Condition  New
Details
Sealing Cap, coolant tank BEHR HELLA SERVICE *** PREMIUM LINE *** (HELLA, 8MY 376 743-451) -21%
Sealing Cap, coolant tank | HELLA 8MY 376 743-451 Article №: 8MY 376 743-451
HELLA Sealing Cap, coolant tank 8MY 376 743-451
£ 12,99
£ 10,26
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Over 100 items in stock
  • Diameter 1 [mm] 66
  • Diameter 2 [mm] 30
  • Opening Pressure [bar] 2,0
  • Version produced by BEHR
  • Supplementary Info BEHR HELLA SERVICE *** PREMIUM LINE ***
  • Condition  New
Details
Sealing Cap, coolant tank (ABAKUS, 017-027-001) -21%
Sealing Cap, coolant tank | ABAKUS 017-027-001 Article №: 017-027-001
ABAKUS Sealing Cap, coolant tank 017-027-001
£ 2,49
£ 1,97
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Over 100 items in stock
  • Colour Black
  • Opening Pressure [bar] 1,5
  • Condition  New
Details
Sealing Cap, coolant tank (FEBI BILSTEIN, 37600) -21%
Sealing Cap, coolant tank | FEBI BILSTEIN 37600 Article №: 37600
FEBI BILSTEIN Sealing Cap, coolant tank 37600
£ 3,99
£ 3,15
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Over 100 items in stock
  • Shifting Points [bar] 1,4
  • Mounting Type Screw Connection
  • Weight [kg] 0,04
  • Condition  New
Details
Sealing Cap, coolant tank (ABAKUS, 053-027-002) -21%
Sealing Cap, coolant tank | ABAKUS 053-027-002 Article №: 053-027-002
ABAKUS Sealing Cap, coolant tank 053-027-002
£ 1,99
£ 1,57
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Over 100 items in stock
  • Colour Blue
  • Opening Pressure [bar] 1,5
  • Condition  New
Details
Sealing Cap, coolant tank (FEBI BILSTEIN, 06568) -21%
Sealing Cap, coolant tank | FEBI BILSTEIN 06568 Article №: 06568
FEBI BILSTEIN Sealing Cap, coolant tank 06568
£ 4,49
£ 3,55
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Over 100 items in stock
  • Thickness [mm] 9,5, 25,0
  • Inner diameter [mm] 37,0, 51,0
  • Diameter [mm] 57,5
  • Colour Black
  • Material Sheet Steel, Elastomer
  • Shifting Points [bar] 1,4
  • Surface Zinc-coated
  • Weight [kg] 0,072
  • Condition  New
Details
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