Re: engine temp reading cool
I've having the exact same problem on my 4.3L V/P unit. It appears that I'm getting some debris through the water system. The first time, it was a chunk of the previous impeller. Now, it seems to be just little bits, like smaller than a pencil lead, that are getting wedged between the sealing surfaces of the thermostat. <br /><br />I've not figured out a good way to flush the system at this point. Due to the cool water at the time of my tests (March), I was figuring that the thermostat was not opening very far at all, even when working normally. <br /><br />However, it is certainly not obvious why it warms up again at low engine loads and cools down at high engine loads. The only thought is that the little chunks are transients and at lower engine speeds the vibrations are less, so there are fewer chunks floating around. <br /><br />I've tried, for a short time, to remove the thermostat and run the engine, but this didn't seem to help. There are comments on this list that this can be a bad thing, due to the inability to transfer heat to the water at high flow rates. Personally, I don't understand this, unless it has to do with turbulance in the water jacket, but I'm still not convinced. <br /><br />The next step, if this re-occurs, is a homemade thermostat gasket with a small hole (1/4 or 1/2 inch) to restrict the flow slightly.<br /><br />I'll be watching this thread to see what you find out.<br /><br />Later,<br /><br /> johnbo
