2018 GMC Acadia
Mileage
69,654
Service Date
4/4/2023
Services Performed
- Inspected vehicle for customer concerns. Found error code P0128 (Coolant Temp Below Thermostat Range) stored in ECU. Pressure tested cooling system, no leaks found. Test drove vehicle and monitored live data. Coolant temp sensor reading normally, but found coolant temp is not rising as it should. Recommend replacement of thermostat before further diagnosis.
- Removed engine covers and splash shields. Drained cooling system. Removed intake piping and air filter housing. Removed intake plenum and upper engine wiring. Disconnected coolant pipe from engine and removed thermostat and pipe assembly. cleaned mounting surfaces and installed new thermostat assembly with new gasket and seal. Filled cooling system and pressure tested. Found coolant hose above transmission has slight seepage. Replaced spring clamp with screw type clamp and retested. No further leaks present. Reinstalled intake manifold with new gaskets. Reinstalled intake piping and filter housing. Connected engine wiring. Started vehicle and bled cooling system. Reinstalled covers and splash shields. Cleared error codes and test drove vehicle. Check engine light did not return, and no error codes present on dash. Cooling fan is working normally, not staying on. Rescanned vehicle. Codes are still stored in history, but will self clear after multiple drive cycles.
Larry D. gave our service a 5 star review on 4/5/2023
