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First I would look at all the hoses for pinhole leaks. The test the water pump by trying to move the radiator fan back and forth(on a longitudinal engine, not transverse). Turn on the engine and see if there is any coolant leaking from the front of the coolant pump. If so, the coolant pump is going bad. Otherwise, can you smell the sweet smell of coolant in the cab? If so, you probably have a leaking heater-core,
If you smell it in the cabin you probably have a leak in the heater core which is up under the dash. Look under the center portion of the dash on both sides and try pulling the carpet back in that area. Chances are you will find evidence of a small leak. Check all hoses for tightness that run along the firewall in the engine compartment as well.
Likely you are in the beginning stage of a heater core leak. at this point, you may be able to temporarily solve the problem by using a good system sealer (I'm partial to the kind that comes as a silver powder) Since we don't actually know the condition of the core, temporary may mean a week or several years, but replacement is expensive and time consuming so I'd definitely give it a try.
Your car probably has AC so the box under the hood has a drain for removed moisture and this can often clog with environmental debris; when that happens, the water can't drain any more and may end up inside the car.
Check for bubbling in the reservoir tank. It is possible that there is a head gasket leak. Look for steam coming from the exhaust pipe? Steam coming out from reservoir cap vent!
With problems like this the only sure way is to go to a workshop and get them to pressure test the cooling system, that is if you dont have a pressure tester yourself. Then it should be seen where you are losing coolant. It may leak from any where, hoses, loose clips, even the filler cap. Is there any sign of antifreeze that has dried
hope this helps
check the reserviour bottle itself underneath for any cracks cause I had a taurus once looked all over for antifreeze leaks and I found it by putting a pressure tester on it
pipe going to the fire wall is usualy the cabin heater. for the time being there should be 2 hoses going to the fire wall coolant in/out. remove them from the pipe on the fire wall and blank them off or if the hose is split replace them. it could be the heater core but that usualy leaks into the cab.
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