Question about 1989 Chevrolet Caprice

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My 89 chevy caprice with a 305 is leaking antifreeze from the back of my firewall (passenger side) onto the exhaust pipe. It is dripping onto the exhaust just past where the two exhaust pipes come together from each side to form a single exhaust pipe.

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Check the heater control valve and the hoses where they go into the firewall. If the leak is not there, then the most likely problem is a leaking heater core. You need to look carefully to find the source of the leak before you can repair it. Use a flashlight, mirror or whatever is necessary to do that. If it is a hose, use extreme care removing it from the heater core connection. best to cut it off with a razor blade. If it is the heater core,most times it will make the passenger side rug wet. If it is the core, it isn't an easy job and I'd consider either getting a haynes or chilton manual to guide you, or, have a good shop do the work.
good luck

Posted on Feb 10, 2010

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Could be,,,,back off intake to head ,,or u have a soft plug rotted out,,ck out soft pug next to starter,,,

Posted on Feb 10, 2010

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  • Expert
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It is either a heater hose connected to the intake manifold or it is the actual heater core. Look behind the carb at the hoses going from the manifold to the heater assembly and wiggle them around while the car is running and look and listen for the leak.

Posted on Feb 10, 2010

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1 Answer

Water drips onto carpet on passengers side front foot area. Can be seen dripping from plastic air ducting above foot area. how to figure out how its getting in. Have replaced windshield.


You can only have 2 issues dripping water onto the passenger floor board. First being a clogged drip line for the ac evaporator. The other is a leaking heater core. Figuring out which one is the issue is fairly easy.

If your vehicle has anti freeze in it when you turn the defrosters on it will smell sweet. If it does you have a leaking heater core. If it does not then the drip line is clogged.

To clear the drip line get under the vehicle and snake the drip line on the firewall. It usually is a 90 degree rubber or plastic piece on the passenger side about a third of the way up the firewall. A leaking heater core means it has to be replaced and not really a job for someone that is not exsperienced.

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