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Air conditioning systems for heating and air conditioning a motor vehicle including a first heat exchanger, a second heat exchanger, a first flow channel, a second flow channel, and a flow guidance element fixed on the second heat exchanger or a retaining device. A flow is able to pass around both h

Air conditioning systems for heating and air conditioning a motor vehicle including a first heat exchanger, a second heat exchanger, a first flow channel, a second flow channel, and a flow guidance element fixed on the second heat exchanger or a retaining device. A flow is able to pass around both heat exchangers along the second flow channel and around only the first heat exchanger along the first flow channel. The flow guidance element projects into a branching region where air inside the system branches at an angle with respect to a face of the second heat exchanger, and the flow guidance element influences such air in the region between the heat exchangers.

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1. An air-conditioning system for heating and air conditioning a motor vehicle, comprising a housinga first heat exchanger arranged in the housing,a second heat exchanger arranged in the housing,a flow guidance element, anda flow channel through the housing,wherein the flow channel begins upstream o

1. An air-conditioning system for heating and air conditioning a motor vehicle, comprising a housinga first heat exchanger arranged in the housing,a second heat exchanger arranged in the housing,a flow guidance element, anda flow channel through the housing,wherein the flow channel begins upstream of the first heat exchanger and continues through the first heat exchanger into a branching region arranged between the first heat exchanger and the second heat exchanger, wherein in the branching region the flow channel divides into an upper first flow channel and a lower second flow channel, wherein the upper first flow channel does not pass through the second heat exchanger, wherein the lower second flow channel continues through the second heat exchanger,wherein the flow guidance element is fixed on the second heat exchanger or a retaining device that fixes the second heat exchanger in the second flow channel and projects into the branching region at an angle with respect to a face of the second heat exchanger, wherein the flow guidance element has an undulating or rectilinear section and an adjoining arcuately curved section, wherein the arcuately curved section is arranged on a free end region of the flow guidance element and is curved at the end of the arcuately curved section towards the second heat exchanger. 2. The air-conditioning system according to claim 1, wherein the flow guidance element is arranged such that a fluid flow into the upper first flow channel from the branching region is influenced by the flow guidance element, and the proportion of a fluid flow passing around the second heat exchanger is reduced by the flow guidance element. 3. The air-conditioning system according to claim 1, wherein the flow guidance element has an S-shaped section and an adjoining C-shaped section curved towards the second heat exchanger arranged on a free end region of the flow guidance element. 4. The air-conditioning system according to claim 1, wherein the flow guidance element is arranged on an edge region of the second heat exchanger bordering a heat exchanging network of the second heat exchanger. 5. The air-conditioning system according to claim 1, wherein the second heat exchanger has a projection extending towards the first flow channel, on which projection the flow guidance element is arranged. 6. The air-conditioning system according to claim 1, wherein the flow guidance element extends in a direction transverse to the first flow channel. 7. The air-conditioning system according to claim 1, wherein the flow guidance element is disposed in a rectilinear prolongation of a wall delimiting the first flow channel. 8. The air-conditioning system according to claim 1, wherein the flow guidance element extends over the face of the second heat exchanger, wherein the second heat exchanger is covered by the flow guidance element in a range from 5% to 50% of the height of the second heat exchanger. 9. The air-conditioning system according to claim 1, wherein the first heat exchanger is an evaporator and the second heat exchanger is a heating element. 10. The air-conditioning system according to claim 1, wherein the flow guidance element comprises a region abutting a wall delimiting the first flow channel and is formed such that the interface between the flow guidance element and the wall is free of steps and edges that would cause a turbulent air flow. 11. The air-conditioning system according to claim 1, wherein the flow guidance element extends in a direction transverse to the second flow channel. 12. An air-conditioning system for heating and air conditioning a motor vehicle, comprising a housing,a first heat exchanger arranged in the housing,a second heat exchanger arranged in the housing,a flow guidance element, anda flow channel through the housing,wherein the flow channel begins upstream of the first heat exchanger and continues through the first heat exchanger into a branching region arranged between the first heat exchanger and the second heat exchanger, wherein in the branching region the flow channel divides into an upper first flow channel and a lower second flow channel, wherein the upper first flow channel does not pass through the second heat exchanger, wherein the lower second flow channel continues through the second heat exchanger,wherein the flow guidance element is fixed on the second heat exchanger or a retaining device that fixes the second heat exchanger in the second flow channel and projects into the branching region at an angle with respect to a face of the second heat exchanger, wherein the flow guidance element has an S-shaped section and an adjoining C-shaped section curved towards the second heat exchanger, wherein the C-shaped section is arranged on a free end region of the flow guidance element, wherein the second heat exchanger has a projection extending towards the first flow channel, on which the flow guidance element is arranged, wherein the flow guidance element comprises a region abutting a wall delimiting the first flow channel and is formed such that the interface between the flow guidance element and the wall is free of steps and edges that would cause a turbulent air flow.