Hey guys I have a problem and I need a second opinion. Starting today, I noticed that on my way to work that my temp gauge shouldn't be at where it should. Usually I'm all warmed up half way to work. But when I got to work, I saw that my gauge was just under the half mark. Usually When warm, my car sits at the half mark. If I look closely I can see it jumping from just under to the half mark back and fourth at idle. If I turn my heat on, it goes down to quarter, and my heat isn't as good as it should be. So I'm assuming its the thermostat. My car is an 03 with spi, 5 speed if that matters. Thanks in advance!