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1990 Cadillac Deville 4dr Sedan
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I am the proud owner of a very nice 1990 Deville 4dr Sedan. It was garage kept and given to my wife and I by her grandfather. Two days ago we developed a coolant leak. Lord and behold that with the hood up, I was lucky to even see the ground for the size of engine...:) . I had to take it to a local garage to determine the source. Turns out it is a rusted hole in something called or close to "rear heater outlet pipe". It is located on the firewall-pulley side of the motor. We contacted the Cadillac dealership here locally which contacted it's computer, anyway it has been discontinued and no dealership possesses one in the good ole USA. I have 2 part numbers and they are #1646975 and #22727133. If anyone can offer any assistance please let me know. At this point I have a Cadillac that I can't drive because of a 3mm hole in a metal line.
 

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'87 Coupe DeVille 4.1L FWD(New engine '08) 1981 F100 '03FXDL
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879 Posts
Depending on someones skill and accessibility to the pipe: cut the bad part out and use Green(color) Silicone hose to 'sleeve' it with SS hose clamps. Where there is a will/there is a way.
 

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95 Fleetwood Brougham / 01 DTS / 11 CTS Lux / 11 DTS Platinum
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A great source for discon parts is Vintage Parts at https://www.vpartsinc.com/

However, I looked and neither of those part numbers match anything. Are you sure on the part numbers? Are there different prior part numbers?

Have you checked Rock Auto and GM parts Direct? According to GM Parts Direct part number 22727133 is a floor mat. I looked at Rock Auto as well. I think those numbers are wrong.

GM PART # 22727133
CATEGORY: Carpet
PACK QTY: 1
CORE CHARGE: $0.00
GM LIST: $65.00
OUR PRICE: $47.32



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2002.5 F55 CORSA STS, 2014 Explorer XLT FWD
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Jedrumheller, Was your father or grandfather in the Atlantic Submarine Force back in the 60's ???

JB Weld won't hold against 16 psi hot coolant for very long. As posted, clean the pipe and sleeve it with silicone automotive hose.
 

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1992 Sedan Deville, 1984 Lincoln Town Car
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759 Posts
JB Weld won't hold against 16 psi hot coolant for very long. As posted, clean the pipe and sleeve it with silicone automotive hose.
With all due respect, Mr. Sub (especially having served in the Military under water :worship:) we are talking about a tiny 3mm hole, or one/tenth inch. I've seen JB weld and/or Bar's leak products seal that off permanently with ease. Engine temps rarely exceed JBweld lowest rated stuff @ 300F (500F for the high end stuff, that would be engine meltdown) and the 16 PSI you mentioned is child's play for the weld products. To tear up the firewall and start sawing and clamping hoses on seems like a lot more work than need be. But as DaveS says, where there is a will there is a way.
 

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2002.5 F55 CORSA STS, 2014 Explorer XLT FWD
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Absolutely no argument that JB Weld products will withstand 16 psi or normal automotive coolant temperatures. I use the stuff a LOT in various boat applications as well as a product called Marine Tex. Both very good for their applications.

BUT, the product requires a very good mechanical adhesion assist: it is not a "glue", it is a cured plastic patch. You cannot just stick a blob over the hole and expect it to hold. To do a proper job would require that, in this case, the metal heater line be removed, cleaned to bare metal, wire brushed, degreased, patched (preferably with a glass tape wrap reinforcement), and then repainted and installed.

To go through that drill, you might as well sleeve the line with silicone tube and be done with it. Heck, you could even cut out the rusted length of pipe.
 

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1992 Sedan Deville, 1984 Lincoln Town Car
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Not the regular JB weld ( I know that is not practical to put a band aid type repair), but the radiator stop leak, PERM-O-Seal.

http://www.jbweld.net/products/permoseal.php

or the Bar's Leak products for the similar problem.

(About now Ranger will chime in with the "SNAKE OIL DOESN'T WORK" theme. LOL!) okay, whatever.
 

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White Diamond '03 DHS (with DTS floor shift)
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JB Weld isn't snake oil. It is a very good product and works extremely well for it's intended purpose. It may or may not work in this case. My concern would be that if one spot rusted through, the rest of the pipe can't be in much better condition, in which case if it does work, it will be temporary at best. Kind of like patching a rusted through exhaust pipe or muffler.
 

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1990 Cadillac sedan devile
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616 Posts
ok correct me if im wrong but is int that stuff about the same as what we all ready have in the cooling system with the sealant tabs .
 

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Depending on someones skill and accessibility to the pipe: cut the bad part out and use Green(color) Silicone hose to 'sleeve' it with SS hose clamps. Where there is a will/there is a way.
I am with Dave S on this one. I had to do this same repair on both of my Devilles, 86 & 88. Cutting out the rusted part & replaceing it with the green silicone hose to sleeve it was not that hard to do & it worked great.:thumbsup:
 

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1990 Cadillac Deville 4dr Sedan
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Discussion Starter #15
So.....where would i take something like this to have siliconized? And thanks for all the replys.
 

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2002.5 F55 CORSA STS, 2014 Explorer XLT FWD
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You don't take it anywhere - you pull it apart and clean it yourself and use a piece of silicone hose which is available from a GM dealer or a large parts store.

Otherwise, if you don't want to DIY, any decent local auto shop can do the job. Couple of hours labor and $35 in hose, clamps, and new coolant.
 
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