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Re: p0128
P0128 Engine Coolant Temp below regulating Temperature. This can mean that your thermostat is stuck open. What is your engine temp guage doing during normal driving?
If the thermostat is stuck open, your engine will never get warm, causing reduced gas mileage, and you won't get good heater performance.
The thermostat on the 3.8 is easy to change, and you can get one at any autoparts store for about $10.
Another cause could be a bad temperature sensor. This is not as easy, but you can still do it yourself in the driveway. I don't know how much the sensors cost, but again, autozone should have them.
I have also heard of a leak in the coolant system causing this code. Is the radiator full, and have you seen any signs of a leak?
Your local mechanic could handle this if you don't want to pay a lot at the dealer. It doesn't sound like a big problem.
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