Ok, I replaced my t-stat, and checked my temperature sensor and it's good. So here's the problem. My car won't come up to operating temperature. The needle stays way low, like almost on the C. Even after driving for 2 hours on the highway and on backroads I could'nt get it to heat up. The gauge is working, I checked that out, and the heater is blowing cold air. So, why won't it get warm? I'm stumped. What would make a car stay cold, t-stat? It's new and installed with the jiggle pin up, so that should'nt be it. Any help is much appreciated.