A valve assembly including: a housing (12, 152) having an inlet (14, 154) for receiving fluid and first and second outlets (16, 156 and 18, 158) for delivering the fluid from the valve assembly, and thermal and priority valve members (44, 176 and 46, 178) which can shift in the housing (12, 152), wherein the first outlet (16, 156) is configured to receive fluid from the inlet (14, 154), in which the thermal valve member (44, 176) can be shifted by the action of first and second springs (90, 220 and 92, 222) between a first position in which fluid flow from the inlet (14, 154) to the priority valve member (46, 178) is permitted and a second position in which such fluid flow is blocked, and at least one of the springs is responsive to temperature changes of the fluid flowing through the housing and has a spring force which increases when the fluid temperature is above a predetermined temperature so as to overcome the spring force of the other spring, wherein the thermal valve member (44, 176) is shifted between the first position and the second position depending on whether the fluid temperature is above or below the predetermined temperature, wherein the thermal valve member (44, 176) is shifted in the first position when the fluid temperature is below the predetermined temperature, and in which the priority valve member (46, 178) can shift against a biassing force by the application of pressure above a predetermined pressure at the inlet (14, 154), the priority valve member (46, 178) shifting between a first position in which flow from the inlet (14, 154) to the second outlet (18, 158) is blocked and a second position in which such flow is permitted depending on whether the pressure is above or below the predetermined pressure, wherein the priority valve member (46, 178) is shifted in the first position when the pressure is below the predetermined pressure. a housing (12, 152) having an inlet (14, 154) for receiving fluid and first and second outlets (16, 156 and 18, 158) for delivering the fluid from the valve assembly, and thermal and priority valve members (44, 176 and 46, 178) which can shift in the housing (12, 152), wherein the first outlet (16, 156) is configured to receive fluid from the inlet (14, 154), in which the thermal valve member (44, 176) can be shifted by the action of first and second springs (90, 220 and 92, 222) between a first position in which fluid flow from the inlet (14, 154) to the priority valve member (46, 178) is permitted and a second position in which such fluid flow is blocked, and at least one of the springs is responsive to temperature changes of the fluid flowing through the housing and has a spring force which increases when the fluid temperature is above a predetermined temperature so as to overcome the spring force of the other spring, wherein the thermal valve member (44, 176) is shifted between the first position and the second position depending on whether the fluid temperature is above or below the predetermined temperature, wherein the thermal valve member (44, 176) is shifted in the first position when the fluid temperature is below the predetermined temperature, and in which the priority valve member (46, 178) can shift against a biassing force by the application of pressure above a predetermined pressure at the inlet (14, 154), the priority valve member (46, 178) shifting between a first position in which flow from the inlet (14, 154) to the second outlet (18, 158) is blocked and a second position in which such flow is permitted depending on whether the pressure is above or below the predetermined pressure, wherein the priority valve member (46, 178) is shifted in the first position when the pressure is below the predetermined pressure.