In its latest in the PROTIPS series, Blue Print has highlighted a solution to a common Thermostat problem on many Opel, Vauxhall and Chevrolet models which can be solved by the replacement Blue Print Thermostat ADG09255. 

The issue is that the engine cooling fan is constantly running, leading to poor heater performance or even the engine overheating. The engine warning lamp illuminates and the possible fault codes stored in the ECU are:

P0597 - Thermostat heater control system - open circuit.

P0598 - Thermostat heater control system - circuit low.

P0599 - Thermostat heater control system - circuit high.

This is caused by an old, or incorrect, type of coolant being used, causing corrosion or sludge build-up in the cooling system and preventing the thermostat from fully closing or opening. If the coolant temperature is detected to be above or below the optimum temperature range, the engine control unit has a built-in failsafe mode that will switch on the cooling fan.

Blue Print recommends that before replacing the thermostat, the technician should inspect the electrical connection and check the water temperature sensor is operating correctly. Once the thermostat has been identified as the source of the issue, flush out the coolant system and replace the thermostat. Replace the manufacturer’s recommended coolant, bleed the cooling system of any air and clear the fault codes using a suitable diagnostic tool.

The replacement Thermostat ADG09255, fits the Chevrolet Cruze (J3**), Aveo (T3**), Opel/Vauxhall Adam (M13), Astra J, Corsa D, Corsa E, Meriva B. Relevant engine codes are LDC, LDD, LWD, A12XEL, A12XER, B12XEL, Z12XEP, A14XEL, A14XER, B14XEJ, B14XEL, B14XER, Z14XEP. 

For more technical information please visit: partsfinder.bilsteingroup.com