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93 Fleetwood,98 Deville
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73 Posts
Discussion Starter #1
My 93 fleetwood has 200+ thousand miles on it. When I stop after short drive on hot day it sounds like it is boing and gurgling? I see no fluid loss under vehicle or anywhere. My reservoir fills normally when running and goes back to radiator when cooled. I took cap off and ran with heater on and it boiled up and over a little. I can see the fluid in radiator bubbling with cap off. The cap "looks ok"?? Am I in trouble? help!!:bigroll::bigroll::bigroll:
 

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84 Coupe w/500
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5,665 Posts
One of my recent tool purchases is a radiator pressure tester. If you're boiling over but not overheating yet, I think that means you have low pressure in the coolant system because of a leak somewhere. The lower the pressure in the coolant system, the lower the boil over temp. You'll have to find where the leak is.
 

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1992 Fleetwood S&S Hearse, 1993 Buick Roadmaster
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567 Posts
I had the exact same issue, off and on for years with my 1993 Buick Roadmaster - essentially the same car you're driving. It was a series of very small leaks, with the last one fixed being the radiator itself. Once I replaced the radiator, all the trouble went away (even though I still may have a tiny leak somewhere I can't find.) My car had about 230,000 miles when I replaced the radiator, which was a pretty easy job, although I have very limited tools and not a lot of experience.
 

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93 Fleetwood,98 Deville
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73 Posts
Discussion Starter #4
Looking at the cap of radiator....it "looks" ok...the spring seems to work and the fluid does go back and forth to the reservior but gradually over a 3-4 week span...the fluid is low again and I see no leak. The car does seem awfully hot when stopping sometimes. I wrote it off to real hot days running air conditioner..help!

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What type of small leaks and where?
 

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87 Brougham, 1969 Calais, 95 FWB, 07 SRX, 07 ESV
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4,246 Posts
rent a pressure tester and maybe even get one that can test the cap too. small leaks could be like a tiny drip from the thermostat housing, loose or cracked hoses, etc.

It could be that you don't see the leak because it is evaporating as it falls out since it's likely only leaking when running. Do you notice a smell of coolant?
 

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06 STS-V, 06 DTS Performance - Past 91Broughamd'Elegance,76FWBd'Elegance,98STS,00Eldorado,06STS
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778 Posts
When was the last time you flushed the system?
 
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