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94 -96 Seville heater cross over lines.


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Does anyone know how the coolant cross over lines for the heater can be changed short of removing the engine?

I can't even see these lines in some areas. This is the second Seville that has had the metal line rot out at the point where the coolant tank line and the heater core line connect.

Is it just my bad luck or is this a common problem on the seville's?

Thanks for any pointers. :unsure:

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Does anyone know how the coolant cross over lines for the heater can be changed short of removing the engine?

I can't even see these lines in some areas. This is the second Seville that has had the metal line rot out at the point where the coolant tank line and the heater core line connect.

Is it just my bad luck or is this a common problem on the seville's?

Thanks for any pointers. :unsure:

Which car is this on the 94 or 96. The 96 is 11 model years old and the 13 model years old, its not common but given the age of your and my cars im not surprised. I expect to replace mine soon. These are steel pipes that simply rust through, much like the brake lines.

Pre-1995 - DTC codes OBD1  >>

1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm

How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/

Cadillac History & Specifications Year by Year  http://www.motorera.com/cadillac/index.htm

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Does anyone know how the coolant cross over lines for the heater can be changed short of removing the engine?

I can't even see these lines in some areas. This is the second Seville that has had the metal line rot out at the point where the coolant tank line and the heater core line connect.

Is it just my bad luck or is this a common problem on the seville's?

Thanks for any pointers. :unsure:

I have both years of these Seville's. The 96 model is starting to leak and the 94 just flat broke and lost all the coolant.

Both have this rot problem where the clamp that holds the lines to the engine goes arount the lines.

The lower line on both cars is the one that has rusted so bad.

Anyway, I am wondering just how these lines can be replaced. I can't seem to get at the other retainers that support these lines to the engine.

Even if I could remove the retainers I can't see how the lines will have enough room to be removed.

Has anyone ever replaced the bad section of pipe with a piece of fromed heater hose and have it last?

It looks as if I can cut the pipe just past the bend where it starts to run along the back of the engine.

The T connection on the pipe still looks as if it is in good condition with enough space for a hose to fit over it with a clamp.

Of course the section in back of the engine is still in good coidition.

Any ideas?

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Here is a diagram that may help you for a 96, you see two clamps (#7) at the rear CAM cover.

post-2998-1163554283.jpg

Pre-1995 - DTC codes OBD1  >>

1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm

How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/

Cadillac History & Specifications Year by Year  http://www.motorera.com/cadillac/index.htm

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The first picture below is a photo of the pipes that might be helpful to see the clamps:

Adallak has replaced his, hopefully he'll reply.

Adallak has a 4.9 and the pipe he replaced is located in a different spot not at the rear of the engine like the NS. The second photo is of the 4.9 pipe (loops under the crank pulley) that Adallak replaced it's not applicable to the NS:

post-2998-1163554565.jpg

post-2998-1163554897.jpg

Pre-1995 - DTC codes OBD1  >>

1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm

How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/

Cadillac History & Specifications Year by Year  http://www.motorera.com/cadillac/index.htm

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I saw a pic of one that was replaced with heater hose. Maybe it was as at cadillacforums.

If you used hose, it would need to be routed away from the exhaust manifolds.

Pre-1995 - DTC codes OBD1  >>

1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm

How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/

Cadillac History & Specifications Year by Year  http://www.motorera.com/cadillac/index.htm

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They are really not that bad to replace. With the car up on ramps, disconnect the suspension sensor links and the steering column shaft from the power steering rack and then place a hydraulic jack under the front of the subframe. Remove the two large bolts (one on each side at the front of the subframe) and use the hydraulic jack to lower the front of the subframe about 4 inches or so. That will tilt the rear of the engine up and provide decent access to the crossover pipes.

I had to remove the crossover pipes on my '97 STS when I removed the engine to Timesert it. I reused the old pipes as they were in good shape.

Kevin
'93 Fleetwood Brougham
'05 Deville
'04 Deville
2013 Silverado Z71

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Does anyone know how the coolant cross over lines for the heater can be changed short of removing the engine?

I can't even see these lines in some areas. This is the second Seville that has had the metal line rot out at the point where the coolant tank line and the heater core line connect.

Is it just my bad luck or is this a common problem on the seville's?

Thanks for any pointers. :unsure:

I have both years of these Seville's. The 96 model is starting to leak and the 94 just flat broke and lost all the coolant.

Both have this rot problem where the clamp that holds the lines to the engine goes arount the lines.

The lower line on both cars is the one that has rusted so bad.

Anyway, I am wondering just how these lines can be replaced. I can't seem to get at the other retainers that support these lines to the engine.

Even if I could remove the retainers I can't see how the lines will have enough room to be removed.

Has anyone ever replaced the bad section of pipe with a piece of fromed heater hose and have it last?

It looks as if I can cut the pipe just past the bend where it starts to run along the back of the engine.

The T connection on the pipe still looks as if it is in good condition with enough space for a hose to fit over it with a clamp.

Of course the section in back of the engine is still in good coidition.

Any ideas?

Thanks for all the info.

I did cut the pipe behind the block just before it bends to go towards the coolant tank. I replaced the bad section with a formed hose to the point just before the T connection.

As best I can tell the hose is clear of the exhaust manifold and at this point is not leaking. I may put a heat shield over the hose just for peace of mind.

My concern now is if the clamps will hold the hose on since there is no barb on the pipe that will keep the hose from sliding off. I did use sealer in hopes it will help keep the hose inplace.

I guess I'll soon find out if this all works. Thanks again folks for all the help. :D

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