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2001 Seville STS, 1990 Seville (RIP), 1972 Sedan Deville
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26,323 Posts
The A/C lines go to the evaporator, right in front of the radiator. Oil cooler lines would go into the radiator side tank, or to an auxiliary oil cooler. I don't believe your car has either.
 

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1994 SLS x 2 ---- 1993 Eldorado Sport ----- 1994 Deville 4.9
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1,540 Posts
You updated your vehicle information :)
1994 sedan deville 4.9
Thanks

Yes there are oil cooler hoses/lines under the air filter box, They run from drivers side of radiator to the base of the oil filter.
Pull the air filter box off the motor (about three bolts and nuts).
Then you can get a good look at the lines from radiator to oil filter base.
Sometimes it is the lines, sometimes it is the o rings where the lines seal to radiator.
Had that trouble with mine also.
See post 13 thru 19 http://www.cadillacforums.com/forums/cadillac-deville-1985-2005-including-1985/284445-i-have-issues-1994-deville-4-a.html
 

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1994 sedan deville 4.9
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107 Posts
Discussion Starter #8
You updated your vehicle information :)
1994 sedan deville 4.9
Thanks

Yes there are oil cooler hoses/lines under the air filter box, They run from drivers side of radiator to the base of the oil filter.
Pull the air filter box off the motor (about three bolts and nuts).
Then you can get a good look at the lines from radiator to oil filter base.
Sometimes it is the lines, sometimes it is the o rings where the lines seal to radiator.
Had that trouble with mine also.
See post 13 thru 19 http://www.cadillacforums.com/forums/cadillac-deville-1985-2005-including-1985/284445-i-have-issues-1994-deville-4-a.html
Thank you! ! Would you suspect the o rings or the entire hose needing replacement?
 

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1994 SLS x 2 ---- 1993 Eldorado Sport ----- 1994 Deville 4.9
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1,540 Posts
Hard to tell from here :)
You need to get the air filter box and intake duct work off and get in there.
Do a visual inspection of the problem areas (maybe something obvious).
Next a can or two of brake clean or some other degreaser and some shop towels (compressed air can be very helpful).
Clean everything up as good as you can ( i would do this regardless) as I dislike looking at or working on an oily greasy mess.
Then if you still question the actual source of the leak, run the engine some and see where the problem is.
 

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1995 SEDAN DEVILLE-4.9 & 1978 SEDAN DEVILLE-425
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1,673 Posts
1 of my oil cooler hoses ruptured a few years back on my '95 Deville 4.9., what a mess that was----oil all over the place.
I noticed "before" it ruptured that the oil cooler line/hose seemed almost saturated as the line was slimy.
I should have had the line/hose replaced before it ruptured.I had both lines/hoses replaced at the same time---figured since 1 ruptured the other would be soon to follow.
If your oil cooler lines/hoses are slimy and the original ones----could be a real clue they need replacing.
 

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1994 sedan deville 4.9
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107 Posts
Discussion Starter #11
1 of my oil cooler hoses ruptured a few years back on my '95 Deville 4.9., what a mess that was----oil all over the place.
I noticed "before" it ruptured that the oil cooler line/hose seemed almost saturated as the line was slimy.
I should have had the line/hose replaced before it ruptured.I had both lines/hoses replaced at the same time---figured since 1 ruptured the other would be soon to follow.
If your oil cooler lines/hoses are slimy and the original ones----could be a real clue they need replacing.
Indeed, what was the cost of replacement if you don't mind me asking
 

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2011 Crown Vic LX, 2009 Chevy Malibu 2LT
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5,607 Posts
Fwiw, when I replaced them on my '89, I think they were no longer available. I ended up getting a set made at a local hydraulic shop.
 

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1994 SLS x 2 ---- 1993 Eldorado Sport ----- 1994 Deville 4.9
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1,540 Posts
Rock auto lists them around 100 for both
You have to note inlet or outlet hose when selecting
 
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