Desperate for an answer. I have a Deville DHS year 2000 with 75,000 miles. The springtime brought a new problem - the engine is overheating under any load at all. The temp guage jumps up in large increments while cruising at a steady pace for no reason at all. I found that with the A/C off the problem seems to dissappear and the temp guage stays dead center as it did when the car was first purchased. The dealer has changed the thermostat unit in its entirety, the water pump, the belt and has checked everything that can be checked. They say they now think the radiator may be clogged and they are going to change that too. I wonder if it might be an electrical screw up that is causing the problem. The fans come on at the right temp, the computer lets me know that it's running hot and shuts the A/C off when the temp rises. It then tells me to idle the engine since its too hot to run and the oil light comes on with a message to change the oil. The dash looks like a Christmas tree when all the lights and messages are on. I'm stuck!
Does anyone have any suggestions as to where this problem is located? I cannot drive the car anywhere without the fear of overheating.
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