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Eldorado
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16 Posts
Discussion Starter #1
Hi I have a 96 eldorado and I have a leak problem. A few days ago my girl friend was driving my car, she called me up and said that the car was blowing smoke on the dash board. I took the car home and I notice this coolant by the passenger side on the mat... and smoke is coming out from the dash board and I think most of my coolant was on the ground. Any one knows anything about this kinda situation.
 

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Super Moderator
2010 DTS
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87,559 Posts
Coolant on the passengers side mat is a sure sign that the heater core is shot. Most likely what you saw was steam, not smoke.
 

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69 Thunderbird | 90 Seville | 03 Corolla | 89 Marquis(scrapped) | 72 Torino(scrapped)
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2,026 Posts
You can bypass the heater core to get by until you can replace it which is a PITA in most cars. Someone with a N* can tell you what hoses to connect and where.
 

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Eldorado
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16 Posts
Discussion Starter #4
But it happens only when the engine is running? What are the cause's for the heater core to leak?
 

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Cadillac STS 1999
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7 Posts
Yes the water pump will only pump coolant to the heater core while the engine is running. I don't know if a 96 is the same as my 99 but getting to the heater core requires removing most of the interior of the car up front. Major PITA. Best to leave it to a garage.
 

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Super Moderator
2010 DTS
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87,559 Posts
Aside from having coolant being pumped through the core when the engine is running, it also gets heated up and is under pressure. As to what causes it to leak, erosion, corrosion (lack of cooling system maintenance), age.
 

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Super Moderator
2010 DTS
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87,559 Posts
If you are going to try that, DO NOT use anything other than Bars Leaks tabs (product code HDC or the powdered version G12BP). Put 3 or 4 tabs in the radiator hose NOT in the surge tank.
 

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Super Moderator
2010 DTS
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87,559 Posts
Put them in either radiator hose. It doesn't really matter which one, just don't put them in the surge tank. The tank is a low flow area and they will just sit on the bottom in a big pile of mush and may clog the exit line.
 

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1993 Seville STS
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83 Posts
replacing the heater core only involves going through the glove box not taking the dash out. i had mine replaced over the winter. the shop i had it done at charged me 100 for the part 20 for antifreeze and 150 for labor. i payed them to do it to save me the hassle, but there is an instruction thread on how to replace it on this forum. antifreeze was all over my passenger mat. there was also a film on my windows. it is toxic to inhale that stuff and the film on the windows is antifreeze in the air. it is summer..you can bypass it for now until you get it replaced...but dont drive it while it is leaking.
 

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Eldorado
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16 Posts
Discussion Starter #13
I tried putting some bars leaks, but still leaks and I called up some dealership to inquire the cost and their charging me like 800 bucks just to replace the heater core.. does it really cost that much to fix it or their just trying to rip me off??
 

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Eldorado
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16 Posts
Discussion Starter #15
Thanks to you guys I could drive my car again...I just bypass it for now and I'll just replace the heater core before next month... thanks again
 

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Eldorado
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16 Posts
Discussion Starter #16
hey guys..... one more question.....so I bypass my car and finally got it running without the leak for now anyways, is it bad to take it for a three hour drive non-stop or even a stop and go..... I'm just curious about.
 

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Super Moderator
2010 DTS
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87,559 Posts
Yes. They are two separate systems. You basically disabled the heating system. You still have A/C.
 
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