jschunke Posted March 2, 2007 Report Share Posted March 2, 2007 Hi, It's a '94 SLS Northstar. Shut her down, a few minutes later it's leaking water coolant all over the road - from the center, rear of the engine. Though it doesn't seem to leak every time it's shut down. It doesn't appear to be leaking from those green hoses in the rear. There's so little room back there, making a prognosis very difficult. Any suggestions? It can't be a leaky head? No sign of water in oil, or exhaust. Thanks. Link to comment Share on other sites More sharing options...
BodybyFisher Posted March 2, 2007 Report Share Posted March 2, 2007 As you know, those two green hoses connect to the heater pipes that wrap around the rear of the engine (near the firewall). Its possible that your heater pipes are rusted through, here is a pic of the heater pipes (#5 & #6) and hoses, Mike 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 Link to comment Share on other sites More sharing options...
jschunke Posted March 2, 2007 Author Report Share Posted March 2, 2007 Thanks Mike. It could very well be those heater pipes. They appear to be dealer parts only. Do you think that's something a backyard mechanic can replace without pulling the motor or shrinking himself down to the size of a prune? Link to comment Share on other sites More sharing options...
zonie77 Posted March 2, 2007 Report Share Posted March 2, 2007 It is possible to run heater hose to eliminate the metal tubes. It's been posted a couple of times. Link to comment Share on other sites More sharing options...
BodybyFisher Posted March 2, 2007 Report Share Posted March 2, 2007 Thanks Mike. It could very well be those heater pipes. They appear to be dealer parts only. Do you think that's something a backyard mechanic can replace without pulling the motor or shrinking himself down to the size of a prune? As you can see, there are two brackets at the bottom of the rear CAM cover..holding those pipes The hard part however will be detatching them from the GREEN hoses as they are below the water pump crossover. I would hate to have to remove the crossover to get at the hoses. Someone recently sprung a leak in a GREEN hose clamp and while he completed the job, he said it was tough. I priced those pipes last week from Brasington for my 96: PIPE (25671310) - $32.36 PIPE (25688468) - $28.60 I am about to drop my carriage to do the ISS sensor and thought that it would be a good time to replace those pipes.. I don't know your 94 to opine on the job, but I am sure your GREEN hoses are under the crossover take a look. Confirm that you have a bad pipe before you replace them, maybe a bad clamp or GREEN hose is the cause, even the black hoses on the passenger side and the water is running down... They are pipes and not hoses because as you can see in this photo they travel above the exhaust manifold so they are subject to heat, the green hoses are silicone to resist heat better. Here is a photo of the rear of the engine showing the pipes: 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 Link to comment Share on other sites More sharing options...
jschunke Posted March 2, 2007 Author Report Share Posted March 2, 2007 Great pic, Mike. Do you think a blown head gasket would leak so profusely externally as observed the other night? It seems to only leak after it's been driven a while. Thanks. Link to comment Share on other sites More sharing options...
BodybyFisher Posted March 2, 2007 Report Share Posted March 2, 2007 I am not implying that its a head gasket, but yes, a head gasket can leak externally, see this photo, the water jackets surround the cylinder, it is possible for the gasket that is on the perimeter of the deck to leak externally.. but don't jump to conclusions unit you get in there....and look 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 Link to comment Share on other sites More sharing options...
BodybyFisher Posted March 2, 2007 Report Share Posted March 2, 2007 Look at this thread, this member went nuts trying to find his leak... You will notice that a few members stated HEAD GASKET.... DON'T PANIC.... http://caddyinfo.ipbhost.com/index.php?sho...=heater%20pipes 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 Link to comment Share on other sites More sharing options...
jschunke Posted March 3, 2007 Author Report Share Posted March 3, 2007 It was leaking from the lower green hose after all. Tightened clamp and seems OK. Link to comment Share on other sites More sharing options...
jschunke Posted March 7, 2007 Author Report Share Posted March 7, 2007 Something srung a leak in the viscinity of item 13 in the diagram previously posted. It does not appear to be leaking from the green hose. At 14 psi it sprays a steady stream towards the passenger side. Too tight to tell exactly where the source is. Could that crossover be leaking? How hard is it to remove the crossover? thanks. Link to comment Share on other sites More sharing options...
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