Do you have a Chilton or Hayes manuel on the vehicle they will guide you in th removal and install of the heater core unit, Every one i have changed out has been under the dash and difficult to do.Go to a radiator repair shpo they should be able to help out with a new one or a rebuilt unit .
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It could either be the heater core leaking or the A/C condenser leaking due to the drain for the "sweating" being plugged up. Sometimes bees build nests in the drain tube. Check the antifreeze make sure it's not low.
If you smell antifreeze inside the car then you probably have a bad heater core causing the coolant to leak inside you vehicle and giving you the antifreeze smell which will make you sick. If you windshield is all foggy and hard to clear and the right passenger floorboard is wet then your heater core is leaking.
You can drain the coolant out of your car by taking off the lower radiator hose. This will get most of the coolant out of your car. If you have a hose leaking under the hood you may smell coolant inside the car, but it shouldnt be too bad, if you have a leaking hose however it should be pretty obvious and your car may even be overheating.
Chanses are that little hole will turn into a big hole its only a matter of time, its not that hard, don't be inteminated by it, even if you have never done one before. Chk. the carpet on the pasengers side floor see if its wet, anyhow if you can smell antifreeze thats what it is heater core.
A good indication that the heater core is bad, is if you get a oily
film on the windshield when the defroster is on. If the headgasket is
leaking, the engine should run hotter than normal,you might get oil in
the radiator,you might see coolant dripping down the engine. I would
start with checking out the heater core first. It is a very big job(the
dash has to come out).
from he Popular Mechanics site if the smell in your car is like maple syrup:
(1) SMELLS LIKE:
MAPLE SYRUP WHEN: After the engine has warmed or possibly even after it's shut off for a few minutes. THE CULPRIT: Coolant containing sweet-smelling (but toxic)
ethylene glycol is leaking from somewhere. It could be coming from a
radiator or heater hose, a failed intake manifold gasket or cylinder
head. It might be coming from a leaky radiator cap or the radiator
itself, especially if you smell it outside the car. A strong odor inside the passenger compartment probably means a bad heater core.
The same thing happened to my '99. I found an 'off' brand heater core locally then seached the internet to find direction on how to install. I don't remember the link, but someone had posted pictures of the step by step. Although I must say the sticking point for me was removing the screw holding the heater core to the pipes coming from the front of the car then removing the core holder.
It took me a couple of hours, not really knowing what I was doing, but went real smooth. It's fixed for around $140! And NO MORE ANTIFREEZE SMELL!!