A fluid control assembly 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 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 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 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. <EOS>