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1993 Cadillac Deville Antifreeze Spitting Out the Reservoir

Tiny
LILDUKE
  • MEMBER
  • 1993 CADILLAC DEVILLE
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.
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Sunday, June 30th, 2013 AT 8:44 AM

10 Replies

Tiny
JDL
  • MECHANIC
  • 16,098 POSTS
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?
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Sunday, June 30th, 2013 AT 9:12 AM
Tiny
LILDUKE
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When you say possible head gasket issue. Can you explain?
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Monday, July 1st, 2013 AT 4:34 PM
Tiny
JDL
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There could be combustion gases in the coolant caused by a head-gasket problem?
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Tuesday, July 2nd, 2013 AT 6:50 AM
Tiny
LILDUKE
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  • 21 POSTS
Wow, interesting. Well I'm going to do a radiator flush to see if that works.
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Wednesday, July 3rd, 2013 AT 6:52 AM
Tiny
JDL
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Let us know how it goes.
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Wednesday, July 3rd, 2013 AT 6:55 AM
Tiny
LILDUKE
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  • 21 POSTS
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.
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Thursday, July 4th, 2013 AT 12:06 PM
Tiny
JDL
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You could do a cylinder compression test? You would need a compression gage.
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Thursday, July 4th, 2013 AT 2:59 PM
Tiny
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Ok, I will look into it
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Sunday, July 7th, 2013 AT 7:45 AM
Tiny
LILDUKE
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  • 21 POSTS
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?
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Sunday, July 7th, 2013 AT 7:53 AM
Tiny
JDL
  • MECHANIC
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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.
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Sunday, July 7th, 2013 AT 9:43 AM

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