Engine Never Seems To Get Warm

[Carlo]

I have a 5 ton, Cummins NHC-250. It seems the engine never gets warm. I have replaced the thermostat and only gets about 120 degrees. Any other ideas? I am new to SS and this is the first MV I have owned. Thanks for your help in advance.

What kind of anti frezze are you using? I agree with the others that you are going to need to block that radiator some. My 931A1 has the same problem but my 923A2 does not. I drove it over the austrian / Swiss alps last month and I was turning the hea off! Im not use to this but did like it....