Intervention performed on a light vehicle following an overpressure issue in the cooling system.

Customer report: coolant temperature rise and abnormal pressurization of the expansion tank.

An initial diagnostic performed at a manufacturer's garage pointed to a faulty EGR cooler.

Resumption of work with replacement of the EGR cooler.

Following the replacement, as the fault was still present, an additional diagnostic was performed.

After analysis, an internal engine issue is suspected.

A quote was prepared for cylinder head removal, pressure testing, and cylinder head gasket replacement.

Parts replaced / intervention:

EGR cooler

In-depth diagnostic performed

Quote prepared for additional intervention (cylinder head / cylinder head gasket)