are you losing any coolant at all? if your engine is running at optimal
temperature not over heating or running too cool. i would suggest taking a
look at / flushing your heater core... if your heater core gets clogged up it
will have a hard time circulating antifreeze or if its leaking it will not get
hot. Assuming you are not loosing any coolant i would highly suggest
flushing your heater core. there are many places that do this and it
shouldn't be too overly expensive however if you are a do it yourself-er
here is a video that may help you along. you will be looking for 2 hoses
almost side by side going to the passenger side of the fire wall typically
closer to the floor. and remember to back flush. the hotter line is input
and cooler one is output. reverse them for your flush. good luck and let
me know of your results :)
http://www.youtube.com/watch?v=dcL_0TWeZJY
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