I just purchased this vehicle, while driving it home on the interstate after about 100 miles of driving it overheated.. i pulled over and look at the coolant tank and it was super low.. ? so i added a full jug of coolant and topped the rest off with water. i made it home about 170 more miles without any probs. i been driving it about 40 miles a day with no probs and watching the temp gauge. the levels are right where it should be. i check the coolant level daily and it dropped about 1/4 from the very top. everything seems normal now. Im just concerned about why was it so low in the first place. and when i looked in the glove box there is a receipt for a radiator flush, new water pump, and thermostat. there is no leaks. i idled it last-night for about 30 min after i drove it. and the temps got to 222 before the blower kicked it and brang the temps down. this morning there was cooling stains on the driveway im assuming from the pressure hose. but it all looks normal.
If you are using coolant that is mixed 50-50 with water, the water will evaporate. If you are having issues and using straight antifreeze without a water mixture, you may have a small coolant leak or a small leak in the head gasket.
SOURCE: 1997 cadillac sls overheating
Allow it to cool down and refill system while running with heater on hot. Hopefully this will get the air out of the system. However, if this condition persists, have the radiator checked for hydrocarbons. These engines are sensitive to overheat and you may have blown a head gasket. (hope not)
Good luck!
SOURCE: overheating 1999 cadillac deville
THIS SOUNDS CRAZY BUT, ON SOME OF THE OLD SCHOOL CARS, THEY HAVE A CLUCH FAN.. AND IF ITS BAD, THE CAR WILL OVERHEAT WHEN DRIVING AND COOL DOWN AT IDLE.. I DONT THINK THE CADY HAS A CLUTCH FAN, BUT I BET ITS IN THE FAN.. GOOD LUCK KEITH..
SOURCE: 1999 cadillac deville overheating
my husband did everything that everyone else did that had this overheating problem. It was so weird that my engine cooled at a light and heated up going down the road. I have a north star 4.6 engine and this is natorious for happening. my check engine light also came on and so I had a diagnostics done which told me my #1 injector wasn't firing , car ran like **** as well. After putting in a new water pump and plugs,ect. and realized injector was good a friend told him we could have a blown head gasket. So just to see if this was the problem I went to buy a bottle of glassbeads and the auto parts guy told us to purchase a bottle of BARS STOP LEAK BLOCK SEALER NOT RADIATOR BUT BLOCK SEALER $31.99 . He followed the directions and we waited 24 hrs. before driving it. What ever the problem was has stopped my car runs like brand new and I am loving it again. no over heating no injector problem, runs great.......I hope this helps. I know its probly a temperary fix but its a fix and now we know what the problem was. SASSY
SOURCE: 97 cadillac deville only overheats on hills it has
The most common overheating problem with the Northstar engine is a blocked purge line. It's job is to purge air out of the cooling system.
There is a small diameter hose coming from near the top of the coolant tank,this is the purge line.
With the engine idling,pull the purge line from the tank,if there is no coolant flow from this small hose,it is blocked and this will cause overheating.If the hose is clear, check for blockage at the nipple on the tank.Or trace the hose back until you find the blockage.The hose goes in to the engine to a crossover and comes out the other side to near the thermostat housing,the blockage may be there.
SOURCE: Car overheating, Cadillac Deville
maybe it is cloged up. also check the fans. and the thermastat. and temp sensor.
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