Patent ID: 7234515

Claim:
A heat exchanger for a motor vehicle comprising: a first coolant box that includes an inlet chamber with at least one side opening and an outlet chamber with at least one side opening; a second coolant box; a tube block disposed between the first and second coolant boxes and attached to both coolant boxes; an inlet tube attached to at least part of a longitudinal side of the first coolant box, the inlet tube further including at least one radial opening that is joined in fluid communication with a side opening of the inlet chamber; an outlet tube attached to at least part of a longitudinal side of the first coolant box, the outlet tube further including at least one radial opening that is joined in fluid communication with a side opening of the outlet chamber; and wherein the at least one radial opening of the inlet tube and/or the outlet tube comprises a slit of a predetermined varying width that extends in the longitudinal direction of the inlet tube and/or the outlet tube.