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chiltons auto repair manual
Probably the heater core, it is a beast of a job to do, but is gratifying to say the least. If the is a smell of antifreeze you can almost bet it is the heater core.
The heater core may be stopped up. Try flushing it, or replace it.
Buy a kit at Wal-Mart or auto parts comes with instructions
$600.00 to $1000.00
in my 89 Oldsmobile delta 88 , the heater motor was directly under the center of the windshield under the hood. black circular thing.
What is and where is the soft seal located?
Try going to "autoaccessories4less.com.
V6 3.8 liter.
remove both hoses from the heater and join them with a short piece of pipe about the size of the inner diameter of the hoses. use 2 hose clamps to sealed and hold the hoses on the pipe. Or- cut the hoses and do the same type joining. later you will need another pipe and two more clamps if you want to rehook it to your heater core.
possible leak in heater core.
The price of the heater core is around $50. The labor costs to replace it can be as high as $300. This is a very labor intensive job.