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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... :)
The red square with the wavy light is a low coolant warning light. The check engine light could be on for many reasons. I would check the coolant and add some if it's low. Then you can take your car to many different places to have the engine code read. Most AutoZones and Advanced Autos and other auto parts places will have a customer use code reader and will pull the code for you for free. I would address the coolant problem asap, low coolant can cause your engine to overheat and blow the engine. The engine light may also just be on because you have the low coolant warning. If that IS the reason for the engine light, after cycling (car gets to normal operating temp then completely cold) the car about 3-5 times the light will go off on it's own. Good Luck!