1997 Cadillac DeVille "car overheat going hill" Questions

going up a long hill or putting a load on it and also the service emissions soon light came on today? I have replaced the radiator cap, thermostat, and water pump. What should I check next? What could

...car overheats when the AC is on and dont overheat when its off its an early warning sign that something in your engine cooling system is going bad. such as thermastat or waterpump. or it could mean ...

...car over heats, has anyone checked the coolant temperature with a manual temperature gauge to verify it is truly running over-temp, is the cooling system loosing coolant when it over heats or steams? ...

97 cadillac deville only overheats on hills it has 97 Cadillac deville only overheats on hills it has a new radiator, water pump and rad cap. it runs fine on flat roads and at idle rad fans kick on ...

...overheat when going up hills and subsides when coming down hills. What may be the problem? Is it the radiator? a blown head gasket? the cooling fans not kicking on? or any other possible problems? I ...

...going up hill. I can turn off the AC and it will cool of. If I re-charged the AC system, will that make all the difference in the world, or is this a major issue. I am sick of spending money and want ...

...car would lose power and overheat ALL the time, NOT just on inclines. Please offer your suggestions to all of this. I am a long way from home but feel I need to do something. Should I just return to ...

...going to the same hill that gave us a "Coolant temperature to hot" warning. It's sure a lot cheaper than a new engine or a head gasket job. Besides the Northstar engine has a well known problem with ...

...overheat, though. the head bolt issue is more mysterious, almost intermittant, but definately load related, when heat goes up, like going up a hill. The northstar engine is very well known for blown ...