Looking for some help. I have a 2012 Chevy Suburban 1500 that had a small crack/leak in radiator housing. I replaced radiator in Nov 23'. Refilled coolant through reservoir tank and topped off as vehicle warmed up until tank is filled to proper level. Within a few days of driving with new radiator we experienced an "Engine hot/AC off" warning light on the DIC. Temp gauge dropped to 0 even though engine was at normal operating temps at time of warning light. I started with changing ECT temp sensor on the block as well as splicing a new ECT temp sensor plug onto the factory wiring harness ( Both were Dorman). With new sensor, sensor plug and resetting the battery, all was well for a couple of days then the warning light tripped again. At this point I replaced the Dorman ECT sensor with a AC Delco sensor, as well as a new AC Delco thermostat. Reset the battery, and again good for a couple of days and then Engine hot/AC off warning light again. Now I just replaced the Dorman ECT sensor plug with a AC Delco plug so everything with GM genuine parts and within 10 miles, warning light back on.

Anyone out there experience this before, and know what the root cause is?

 

Having this issue with my 2012 Suburban now. Did you find a fix?

 

Did you bleed ALL the air out of the cooling system ????