Help!! I have an 86 325 that alway ran 1/4 to 1/2 on the temperature guage, even in the hot texas summers. Now in the last two weeks it has started running warmer, infact last night it got to 3/4. I have has the radaitor flushed and the temostrat seems to be opening. Any ideas what it could be before I take it to a mechanic or perhaps it is something that my husband can fix himself. Thanks for any ideas