Damage to the coolant radiator by using the wrong screws

10 May 2024

After fitting a new coolant radiator, there are cases of leaksand loss of coolant. The reason is often an installation error.

Cause of many radiator failures

One of the most common reasons for complaints after replacing a coolant radiator are leaks. In many cases, the cause is the installation of the wrong screws. If screws of a specific length are provided for individual mounting points of the coolant cooler or coolant fan, an accidental mistake can have fatal consequences.

The same applies if the lost original bolts are replaced with overly long replacements. In both cases, excessively long bolts can puncture the coolant reservoir or lead to cracks on the radiator support housing and thus to coolant leakage.

Correct installation of the coolant radiator

When disassembling and assembling, pay attention to the length of the screws in the respective mounting position. Only the screws specified by the manufacturer may be used and, if lost, replaced with screws of the same type and length. MAHLE coolant coolers with the SIMPLE FIT designation are supplied with the appropriate mounting materials such as screws, gaskets, clamps, etc. If there is dirt or liquid in the blind holes, this must be removed before assembly, e.g. using compressed air. Otherwise, there is a danger of damaging the coolant cooler housing even if screws of the correct length are screwed in.


After replacing components in the cooling system, the system must be carefully vented. The use of a vacuum venting device prevents malfunctions and air bubbles. Only coolant approved by the manufacturer may be used. In addition, gaskets on open connections (e.g. quick couplings, flanges, etc.) must always be replaced. They must be moistened with clean coolant before assembly to avoid damage caused by dry assembly.


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