2001 Chrysler LHS

I have a problem with the heat/cooling system in my 02 Sonoma (v-6). The heat works OK until the gauge reads about the middle (works fine as the truck is warming up from a coldf start) But... once it gets to about (the gauge reading anyway) 210 deg, the heat stops heating, it gets cold. Then, the engine temp, while driving at the same speed, engine load etc, drops offs 20-30 deg and it stays cold. Once I stop and the truck cools off, its OK until the process repeats. This morning, the check gauges lite (not check engine) came on and low and behold the temp was peaking towards the high end of the scale. I put the thing in neutral and coasted down the hill I was on and pulled over. I let it run for .. maybe one minute , probably less and, the temp went back to 'normal': normal being where it had the drop off to the 180 range. The heat still did not work. In the past it was quite fine and steady at about 200-210 deg (on the gauge) with the only deviation being under heavy or light load, as I would expect. Is this as simple as a thermostat ? Or is there some other (which would be sure to aggravate me) electronic problem. I sure would appreciate any inputs. I will probably just change out the thermostat (I have not looked at it yet so I hope it is accessible) This thing has only 60k miles on it and never again... no more Chevys, no more GMC no more American. I have fixed too many never-should-break items on this 'gem'. Now I feel better;; so if there are any ideas I would appreciate the input Bob

I have a 2002 jeep suv with 4.7L engine which I am told was manufactured by Mercedes. Since a recent cold snap, when the engine is started cold, and on the road, the first brake application causes the oil press low warning to light. The sensor was leaking and has been replaced. As my wife drove to work at hiway speeds this am, the light came on for a few seconds and then back off. Anyone had a similar problem? Thanks gardener321