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Hello all. I am new to the Cadillac. I just bought 1988 coupe Deville. It is very clean and was well kept. I got it form a friend that needed money. But he is little help to me. He bought it and parked it because he had trouble getting the title and never really drove it. Any ways the problem I am having is that the coolant, temp, fan warning light comes on.
So I got back home and with the car running. I checked under the hood and I found that the coolant reservoir was almost full to the top and bubbling. It normally sits right at the full when hot line. I found this odd and decided to pop the radiator cap. When I did there was a rush of air and the reservoir began to overflow. I looked in the radiator and there was not much coolant in it at all. There was no steam and it did not idle rough at all. I am no mechanic, but I thought that as the fluid expands in the radiator it flow over into the reservoir. I did not think there was not enough fluid to push it out. So I turned it off. The next day I went out to check it and the coolant is down but still above the line. And the fluid in the radiator was back up about 2 to 3 inches from the top not sure what the norm is. Drove it again and about 10 to 15 min of driving the same thing happened. I am very confused and wanted to see if anyone knew what was going on with it, before I went to have it checked out. It’s a 4.5 v8 dig fuel injection. Any help would be great thanks in advance. I am not losing fluid as far as I know jus what over flowed.
 

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Katshot said:
Welcome aboard.
It sure sounds like it's over-heating. You need to check to see if the thermostat is opening, if the fan(s) are operating, etc.

I dont know much, but the fans are moving as far as the thermostat opening I dont know where to look for that. But nothing is hot at all everything is warm to the touch.
 

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lunaemt said:
Hello all. I am new to the Cadillac. I just bought 1988 coupe Deville. It is very clean and was well kept. I got it form a friend that needed money. But he is little help to me. He bought it and parked it because he had trouble getting the title and never really drove it. Any ways the problem I am having is that the coolant, temp, fan warning light comes on.
So I got back home and with the car running. I checked under the hood and I found that the coolant reservoir was almost full to the top and bubbling. It normally sits right at the full when hot line. I found this odd and decided to pop the radiator cap. When I did there was a rush of air and the reservoir began to overflow. I looked in the radiator and there was not much coolant in it at all. There was no steam and it did not idle rough at all. I am no mechanic, but I thought that as the fluid expands in the radiator it flow over into the reservoir. I did not think there was not enough fluid to push it out. So I turned it off. The next day I went out to check it and the coolant is down but still above the line. And the fluid in the radiator was back up about 2 to 3 inches from the top not sure what the norm is. Drove it again and about 10 to 15 min of driving the same thing happened. I am very confused and wanted to see if anyone knew what was going on with it, before I went to have it checked out. It’s a 4.5 v8 dig fuel injection. Any help would be great thanks in advance. I am not losing fluid as far as I know jus what over flowed.
Sounds like the thermostat is messed up, but it could just be massive amounts of air in the system. Now that it's cold, crack your radiator cap again and fill the radiator with new 50/50 mix of coolant and water. Once it's full, start the engine and let it idle till she's warm. make sure to keep the radiator cap off this whole time. If it sucks the coolant down into the radiator, keep adding more. I'm sure there is lots of air in the system right now, and she'll probably guzzle coolant. You can speed things up by gently squeezing the upper radiator hose. As she warms up you should start to see bubbles coming up and out the hole where the cap goes, and the coolant in the radiator should start moving. Keep topping off the radiator until the bubbling stops.

You can tell when the thermostat is open when the coolant seems to be rippling gently when you look into the radiator cap hole. Now, if as she warms up she just starts flooding coolant up and out of the radiator, chances are its the thermostat, but something is messed up. and it should be looked at by a mechanic.
 

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Mogul345 said:
Sounds like the thermostat is messed up, but it could just be massive amounts of air in the system. Now that it's cold, crack your radiator cap again and fill the radiator with new 50/50 mix of coolant and water. Once it's full, start the engine and let it idle till she's warm. make sure to keep the radiator cap off this whole time. If it sucks the coolant down into the radiator, keep adding more. I'm sure there is lots of air in the system right now, and she'll probably guzzle coolant. You can speed things up by gently squeezing the upper radiator hose. As she warms up you should start to see bubbles coming up and out the hole where the cap goes, and the coolant in the radiator should start moving. Keep topping off the radiator until the bubbling stops.

You can tell when the thermostat is open when the coolant seems to be rippling gently when you look into the radiator cap hole. Now, if as she warms up she just starts flooding coolant up and out of the radiator, chances are its the thermostat, but something is messed up. and it should be looked at by a mechanic.

Wow you right about the air in the system. It would suck the fluid down then I would fill it up. It took about 5 times then it stoped. Then I took it for a test drive. I drove it hard to try and recreate it. But the light never came back on. Thank you by the way. Is this a quick fix or am I done with it? Should I still have it looked at? And by the way what may have caused this? Is this a warning that something really bad is going to happen? Thanks again lots of help.
 
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