I have a 2015 hunter edition 900 xp that I had a heater installed in with full cab. I was wondering if anyone had one like it and how fast the temp comes up. Mine acts like it doesn't even have a thermostat. With the temps like they have been in the 30s it will usually only get up to about 160 and a lot of times if I run it down the road the temp will decrease once air gets moving through radiator. Is this normal?