According to the TSB document that GM issued this week, a small number of its 2021 model year crossovers may have a coolant inlet pipe that may present an obstructed threaded hole for the coolant temp sensor which could result in the check engine light coming on or a potential coolant leak. The following vehicles are involved in this TSB action:
Dealers are instructed to replace the coolant inlet pipe and the temperature sensor in affected vehicles. It is estimated that there are only 15 vehicles affected by this problem that will require repair parts. These repairs will take a little over two hours for certified service centers to complete. Some other vehicles may not need repair parts, so long as they pass a cooling system leak check.
Vehicles that do require repairs will need the following parts replaced:
- Engine Coolant Thermostat Inlet Pipe
- Engine Coolant Temperature Sensor
- Gasket, Thermostat Inlet Pipe
- Engine Coolant
- Exhaust Pipe Clamp
- Catalytic Converter Gasket
- Exhaust Muffler Gasket
The problems addressed in this bulletin may affect customer vehicles as well as vehicles that are still sitting on GM dealership lots. The TSB will expire at the end of each affected vehicles’ new vehicle warranty period.
The Chevy Blazer is built at the GM Ramos Arizpe plant in Mexico, while the Cadillac XT4 is built at the GM Fairfax Assembly plant in Kansas. The GMC Acadia and Cadillac XT5 are built alongside each other at the GM Spring Hill Assembly plant in Tennesee.