A heat exchanger assembly comprising: at least one first heat exchanger and at least one second heat exchanger, a bottle and a connection system configured to provide a fluidal communication between the first heat exchanger and the second heat exchanger, wherein the connection system comprises a connection block with a first opening and a second opening, wherein the first opening is adapted to receive fluid from the first heat exchanger, and the second opening is adapted to deliver fluid to the second heat exchanger, wherein the connection block further comprises an intermediate portion located between the first opening and the second opening and comprising: • a delivery plug forming fluid communication between the first opening and the bottle; and • a collection plug forming fluid communication between the bottle and the second opening, so that the fluidal communication between the first opening and the second opening is provided via the bottle, characterized in that the connection block comprises: o a first portion formed with the first opening adapted to receive fluid from the first heat exchanger; and o a second portion formed with the second opening adapted to deliver fluid to the second heat exchanger, wherein the first and the second portions are made of one piece, wherein the first portion, the second portion and the intermediate portion are integrally formed with respect to each other, the first portion and the second portion are orthogonal to each other. at least one first heat exchanger and at least one second heat exchanger, a bottle and a connection system configured to provide a fluidal communication between the first heat exchanger and the second heat exchanger, wherein the connection system comprises a connection block with a first opening and a second opening, wherein the first opening is adapted to receive fluid from the first heat exchanger, and the second opening is adapted to deliver fluid to the second heat exchanger, wherein the connection block further comprises an intermediate portion located between the first opening and the second opening and comprising: • a delivery plug forming fluid communication between the first opening and the bottle; and • a collection plug forming fluid communication between the bottle and the second opening, • a delivery plug forming fluid communication between the first opening and the bottle; and • a collection plug forming fluid communication between the bottle and the second opening, so that the fluidal communication between the first opening and the second opening is provided via the bottle, characterized in that the connection block comprises: o a first portion formed with the first opening adapted to receive fluid from the first heat exchanger; and o a second portion formed with the second opening adapted to deliver fluid to the second heat exchanger, wherein the first and the second portions are made of one piece, wherein the first portion, the second portion and the intermediate portion are integrally formed with respect to each other, the first portion and the second portion are orthogonal to each other. o a first portion formed with the first opening adapted to receive fluid from the first heat exchanger; and o a second portion formed with the second opening adapted to deliver fluid to the second heat exchanger, wherein the first and the second portions are made of one piece, wherein the first portion, the second portion and the intermediate portion are integrally formed with respect to each other, the first portion and the second portion are orthogonal to each other.