Hey all,

My engine temperature gauge is stuck in the red, been like that for a year. If i let the truck sit all night and start it in the morning, the needle still stays in the red, it never seems to go down. My engine doesn't overheat, but it does take forever to blow warm air in the winter, even then it's lukewarm air, not even hot. I'm thinking it might be the thermostat, anyone concur? It's a 99 4.0 with 119k on it as of this post.