I have a 2013 LX 570. I replace the radiator and thermostat today due to a cracked radiator. I Have driving truck several miles on the highway temperature gauge reads normal. Everything seems to be operating fine but the thermostat does not appear to be opening the hose leaving the thermostat and the bottom of the radiator. Cool to the touch it is 45° outside temperature. I did fill the radiator with the engine running radiator cap off. Any ideas?

 

Do you have heat inside the cab?