Hello, I have 2012 cobalt with Volvo 8.1gic-q overheating. Help!! This is the 400 with cats.
I have changed the impeller, the thermostat, the sensor in the thermostat housing and in the back of the engine. I have good flow from the water pump, and freshwater system.
With and infrared thermometer I have checked the temp when it is running at low and high RPMs. Up to 1480 RPMs it stays around 150-165 (thermostat opens at 160. Over 1500 rpms it starts to overheat. The top of the port side head is the hot spot at 206 all hoses water pump and freshwater intake are 108-145. The exhaust is 185 and increases with run time 205 or so. I don’t let it get any hotter. Also engine goes into limp mode.
I have changed the impeller, the thermostat, the sensor in the thermostat housing and in the back of the engine. I have good flow from the water pump, and freshwater system.
With and infrared thermometer I have checked the temp when it is running at low and high RPMs. Up to 1480 RPMs it stays around 150-165 (thermostat opens at 160. Over 1500 rpms it starts to overheat. The top of the port side head is the hot spot at 206 all hoses water pump and freshwater intake are 108-145. The exhaust is 185 and increases with run time 205 or so. I don’t let it get any hotter. Also engine goes into limp mode.