1993 Cadillac Deville Antifreeze Spitting Out the Reservoir

1993 CADILLAC DEVILLE
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LILDUKE
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What does it mean if the antifreeze keeps shooting out the reservoir? I know its over heating. Has the water pump gone bad? What can be done?
I have never seen this before and I'm lost. Both of my cooling fans are working, and I just recently changed the thermostat to the fail safe one. I make sure not to overfill the reservoir, but I'm lost to why the coolant is shooting out of my system into reservoir. Its like my car has a stomach virus and is throwing up, lol.
Jun 30, 2013 at 8:44 AM
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JDL
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You could take the thermostat out, Just for testing, hook everything back up. The coolant flow through the radiator should start instantly with crank, system cold. Can you see or feel coolant flow through the radiator? If no flow, something blocked or as you suggested, water pump.

Possible head gasket issue?
Jun 30, 2013 at 9:12 AM
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LILDUKE
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When you say possible head gasket issue. Can you explain?
Jul 1, 2013 at 4:34 PM
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JDL
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There could be combustion gases in the coolant caused by a head-gasket problem?
Jul 2, 2013 at 6:50 AM
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LILDUKE
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Wow, interesting. well I'm going to do a radiator flush to see if that works.
Jul 3, 2013 at 6:52 AM
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JDL
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Let us know how it goes.
Jul 3, 2013 at 6:55 AM
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LILDUKE
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Well, I did a radiator flush, and its still shooting back over to the reservoir. So I have yet to figure out what is going on. This is new to me.
Jul 4, 2013 at 12:06 PM
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JDL
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You could do a cylinder compression test? You would need a compression gage.
Jul 4, 2013 at 2:59 PM
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LILDUKE
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ok, I will look into it
Jul 7, 2013 at 7:45 AM
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LILDUKE
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I looked into it, and it seemed straight forward and easy on how to use a compression gauge. Can you give me a quick run down on the numbers I should look for when measuring?
Jul 7, 2013 at 7:53 AM
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JDL
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No cylinder should be less than 100 psi. The lowest reading should be, not lower than 70 percent of the highest reading.
Jul 7, 2013 at 9:43 AM