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... :)
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