A fluid control assembly (10,10') comprising: a heat exchange core and a mounting block; wherein the heat exchange core comprises a fluid flow passage, and the fluid flow passage comprises a first hole passage and a second hole passage; the mounting block is fixed with the heat exchange core by welding and comprises a first mounting hole passage and a second mounting hole passage, wherein the first mounting hole passage is arranged in communication with the first hole passage, and the second mounting hole passage is arranged in communication with the second hole passage; and the fluid control assembly (10, 10') further comprises: a valve core member, wherein at least a part of the valve core member is arranged in the first mounting hole passage, the mounting block further comprises a wall portion forming the first mounting hole passage, and the valve core member is sealable to at least a part of the wall portion, characterized in that the first mounting hole passage comprises a first sub-passage and a second sub-passage, the first sub-passage is arranged closer to the first hole passage relative to the second sub-passage, and the fluid control assembly (10, 10') further comprises a communication hole arranged between the first sub-passage and the second sub-passage, wherein the fluid flow passage further comprises the second hole passage, the first hole passage, the first sub-passage, the communication hole and the second sub-passage, and wherein the valve core member comprises a core body, the core body is configured to operate under a pressure difference between the first sub-passage and the second sub-passage, the first sub-passage is in communication with the second sub-passage through the communication hole in a case that the valve core member is in a valve-opened state, and the first sub-passage is not in communication with the second sub-passage in a case that the valve core member is in a valve-closed state. a valve core member, wherein at least a part of the valve core member is arranged in the first mounting hole passage, the mounting block further comprises a wall portion forming the first mounting hole passage, and the valve core member is sealable to at least a part of the wall portion, characterized in that the first mounting hole passage comprises a first sub-passage and a second sub-passage, the first sub-passage is arranged closer to the first hole passage relative to the second sub-passage, and the fluid control assembly (10, 10') further comprises a communication hole arranged between the first sub-passage and the second sub-passage, wherein the fluid flow passage further comprises the second hole passage, the first hole passage, the first sub-passage, the communication hole and the second sub-passage, and wherein the valve core member comprises a core body, the core body is configured to operate under a pressure difference between the first sub-passage and the second sub-passage, the first sub-passage is in communication with the second sub-passage through the communication hole in a case that the valve core member is in a valve-opened state, and the first sub-passage is not in communication with the second sub-passage in a case that the valve core member is in a valve-closed state.