I have a Cdillac Deville 98 northstar. Getting an Error message - Engine overjeat, Change Engine oil, Check Coolant level and later I get Idle engine message I changed engine oil and coolant recently -1500 miles and am not sure for the reason for this. Any help is highly appreciated or possible remedy?

Check engine coolant level. Make sure no coolant in engine oil (crankcase).

Add coolant if low. Check immediately and a few minutes later... if coolant low again identify leak or check oil level. Dont run engine if coolant in oil.

Probably the sensor/sending unit on the engine that sends signal to the light.

Did you over heat warning message come on " Urgent shut off engine" or check coolant message? My coolant message came on but once car warmed up, it was late summer. No leakage but coolant level was low; added some coolant. Then it happened again but once car warmed up the check message disappeared. Then a few days later I got the Urgent Shut off Engine message! Thankfully I was able to pull off road and shut down immediately. Had it towed to Caddy shop. My water pump had gone out. New Pump and replaced all hoses. Then a year later check coolant light came on again, once car warmed up, light went off. This time tho a small leak in the radiator. My husbank put in a new radiator. Car has 117K miles and a few weeks ago outside temp 35, running late for work and didn't allow car to warm up but just a minute or two and when I puled away the check coolant light came on; but once the car warmed up (temp gauge needle in center) the light went out. Being the car is 17 years old I try to treat her like a baby and not push her so I do let the engine warm up before driving away. Do you have to add oil between oil changes? This is normal for the Northstar engine; your regular garages or full service stations don't know this; also make sure if you aren't using an authorized Cadillac garage that they put the right amount of oil; they want to put less than what is required. Not sure if this is really a solution more comments than anything... :)

engine damage
low oil level
incorrect oil
low oil pressure
bad oil pressure switch
bad engine ground
bad oil pressure switch connection or wiring
incorrect or clogged oil filter
incorrect idle speed

Hello: The first thing is check the coolant level. Do this on a cold engine, if engine is a 4.9 check both the radiator and the overflow tank. Make sure they are full of coolant. If it is a Northstar engine then make sure the surge tank is full, this may require checking the tank again after bring the engine to operating temperature then let it cool off. DO NOT OPEN COOLING SYSTEM ON HOT ENGINE it could cause serious burns to you.

no, and oil change will not stop the car from getting hot,,, check to see if your cooling fans are coming on, if not, check fuses and relays, check coolant level

hello,one of the major problem of this car is over-heating.kindly check for the engine cooler flow at the purge line,this is a common problem on the northstar.there is a small diameter hose coming from near 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,this simply means it is blocked and this will cause overheating.if the hose is clear,then kindly check for blockage at the nipple of the tank.i will also advice you to take your car to a service center because it's actually due for servicing,and this has to be attended to as soon as possible to prevent a crashing engine.
Thanks,you are highly appreciated.

7 qts

The oil life resets to zero after the engine overheats. Check for external leaks first, make sure the water pump belt is still there and turning. The most likely cause if the car has over 70,000 miles is head gaskets.