1991 Chevy Corsica Coolant leak from firewall valve

1991 CHEVROLET CORSICA
160,000 MILES • 4 CYL • FWD • AUTOMATIC
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TMROY42
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When I fill the radiator, after about half of what I normally put in, coolant begins to pour out of a valve coming out of the firewall. If I stop filling, it stops dripping after a while, and when I put more in, it continues to come out. When the car is running, no matter if heating or air are turned on or off, a steady stream will continue to come out of the valve.

The valve is a black valve, slightly to the passenger-side of center, with a black rubber elbow fitting pointing straight down. (It is located next to a long metal hose that carries coolant through the firewall, under the car, and back out next to it.) I can't find any other place this might be able to connect with to close the gap in the loop. Any ideas?
Apr 14, 2008 at 1:30 PM
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BMRFIXIT
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the heater core is leaking and you need a new one.
u should have it checked and replaced
Apr 14, 2008 at 1:36 PM
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TMROY42
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Thanks...
what would you consider a reasonable price for that?
Apr 14, 2008 at 3:06 PM
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BMRFIXIT
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Around $450 but you should shop around
Apr 14, 2008 at 6:41 PM