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You probably have a bad heater core. These are located in the ac heater boxes either inside the car or on the firewall box. Moisture from that box will create fog like mist on your windshield..
replace heater core, it's similar to a radiator.
WOW, sorry it has taken so long for someone to see and respond to your question. You've probably figured it out on your own by now, but if not, here is your answer. The heater core in your Caprice is located behind the glove box. To gain access, you have to remove the lower right dash insulator panel (below the glove box) and than the glove box. Remove any vaccuum lines ( mark their locations.) Then remove the lower instrument panel brace and then the heater core cover. Remove the heater core clamp bolt and clamp. Disconnect the heater hoses from the heater core on the left hand side of the engine compartment( looking at the engine from the front of the car.) Then remove the heater core.
Typically, when you have water leaking from underneath your glove box, that means that your heater core is leaking. Your heater core is basically a small radiator located inside your car, just behind your glove box, thjat a fan blows through for the purpose of warming the interior of your car and defrosting the inside of your windshield. This core is fed water via your engines water pump, from your engine where the water is heated, through the heater core and back through the radiator located under the hood of your car and through the engine once again, in a continual cycle. What happens after time, the heater core is of a much thinner construction than your radiator and will corrode through in a much lesser time. The other things which commonly occurs in the heater cores today, is that when your car overheats or blows a head gasket, it will allow the exhaust gas from your engine into your water system and create a tremendous amount of pressure. The heater core is not designed to deal with this extra pressure and typical blows out and leaks water onto the floor board of the passenger side of the vehicle. Heater cores are not all that expensive a part, but to replace it, can be quite difficult on some make and model cars. This information applies to most all make and model cars both previously and currently produced.
the heater core is located in the black box that is in the pictures (see below). To get access to it, you will need to remove the blower housing. The blower housing will separate from the main HVAC box, and will give you some space once it is out. Then we need to wrestle the main box loose from the firewall. That means dealing with the A/C pipes, heater hoses, vacuum hoses, mounting stud nuts under the hood and mounting bolts inside. Once the box is moving, the dash needs to "get floppy" so you can pull back the passenger side far enough to give the main HVAC box enough room pull away from firewall, and to "roll" back towards you. At this point the heater pipes will be visible, and the cover that contains the heater can be removed. It's a big job. Your car has A/C. The description in the haynes book is for a car w/o A/C. If you're not comfortable with plastic dash board removal, this job is not for you
we call this a heater core, and here is how it is replaced. No need to drain the cooling system, just undo the heater core hoses at the firewall under the hood then pull glove box inset, undo bolts for access cover that is over heater core behind the glove box insert, remove cover, remove old core, put new core in, reinstall cover, reinstall glove box, done. I did these in 45 minutes at the Ford dealer I worked at.
The heater core is located inside the passenger compartment behind the glove box.
Remove the glove box liner by removing about 6 screws. Unscrew the heater core cover and you can then see the heater core.
Inside the engine compartment you will be able to see where the two hoses connect to the heater core. Disconnect these and with a little wiggling, the heater core will come out.
Remove the glove compartment by pushing in on the sides and let it fall open. There is a plastic cover behind where the glove compartment with some small hex head bolts (8MM or 5/16in.) take those bolts out and the cover should come off and the heater core is behind that cover. Disconnect the hoses from under the hood and cap the pipes, if my memory serves me correctly the core should pull right out. If you can't cap the pipes try to keep the pipes pointing up as you pull it out to keep the coolant spilling out of the core.