A magnetic resonance imaging apparatus comprising: an MR imaging device including a magnet and heat generating components (18, 20, 22, 24) including a magnetic field gradient chain (20, 22) including magnetic field gradient amplifiers and magnetic field gradient coils driven by the magnetic field gradient amplifiers; a cooling system connected to cool the heat generating components of the MR imaging device using chilled water as coolant; one or more sensors (TS, VS) each configured to measure a thermal parameter of the heat generating components of the MR imaging device or of the cooling system; and an MR controller comprising an electronic processor programmed to control the MR imaging device to execute an MR imaging examination program and to adjust the execution of the MR imaging examination program in response to a thermal parameter measured by the one or more sensors indicating the cooling system has insufficient cooling capacity, wherein the cooling system includes: a coolant circuit configured to cool at least one of the heat generating components of the MR imaging device using the coolant flowing in the coolant circuit; a heat exchanger connected with the coolant circuit and configured to transfer heat from the coolant to the chilled water; and wherein the coolant circuit includes a mixing valve configured to mix coolant from the heat exchanger with coolant from a return line of the coolant circuit to output mixed coolant at a set point temperature; and wherein the one or more sensors include a sensor configured to output the valve setting of the mixing valve of the coolant circuit. an MR imaging device including a magnet and heat generating components (18, 20, 22, 24) including a magnetic field gradient chain (20, 22) including magnetic field gradient amplifiers and magnetic field gradient coils driven by the magnetic field gradient amplifiers; a cooling system connected to cool the heat generating components of the MR imaging device using chilled water as coolant; one or more sensors (TS, VS) each configured to measure a thermal parameter of the heat generating components of the MR imaging device or of the cooling system; and an MR controller comprising an electronic processor programmed to control the MR imaging device to execute an MR imaging examination program and to adjust the execution of the MR imaging examination program in response to a thermal parameter measured by the one or more sensors indicating the cooling system has insufficient cooling capacity, wherein the cooling system includes: a coolant circuit configured to cool at least one of the heat generating components of the MR imaging device using the coolant flowing in the coolant circuit; a heat exchanger connected with the coolant circuit and configured to transfer heat from the coolant to the chilled water; and wherein the coolant circuit includes a mixing valve configured to mix coolant from the heat exchanger with coolant from a return line of the coolant circuit to output mixed coolant at a set point temperature; and wherein the one or more sensors include a sensor configured to output the valve setting of the mixing valve of the coolant circuit. a coolant circuit configured to cool at least one of the heat generating components of the MR imaging device using the coolant flowing in the coolant circuit; a heat exchanger connected with the coolant circuit and configured to transfer heat from the coolant to the chilled water; and wherein the coolant circuit includes a mixing valve configured to mix coolant from the heat exchanger with coolant from a return line of the coolant circuit to output mixed coolant at a set point temperature; and wherein the one or more sensors include a sensor configured to output the valve setting of the mixing valve of the coolant circuit.