One problem related to radiator hose has been reported for the 2018 Chevrolet Colorado. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2018 Chevrolet Colorado based on all problems reported for the 2018 Colorado.
Started the truck on a cold morning, cooling fan kicked in on high within seconds of start. Temperature gauge on dash noted to be inoperative at that time. Hoses from radiator became warm as normal, heat delivery to cab also normal. Drove for a few miles without change in fan speed. Engine turned off, fan speed remained high for several minutes. Same pattern occurred intermittently, with normal function otherwise, including normal function of dash temperature gauge. Codes read at repair shop during one episode showed problem with thermostat. Thermostat/housing replaced on 2/15/21. Truck driven several times without problem, but several days later, problem occurred again, fan on high, temp gauge inoperative. Has been intermittent since, with normal function in between identical malfunction episodes.