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Its leaking from the heater rad,,,all you can do realy is strip it out and put a new one in,,,or,,,,try some rad weld/stop leak/ rad seal/ ,,,it all works,,but for how long???
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Not sure what vehicle you have, but this could be a few things. Here is where I would start to look:
Check to see if the liquid has any scent, specifically antifreeze. If it smells like antifreeze it could possibly be a leaking heater core.
There could be a leak in the windshield gasket, allowing water to run inside the vehicle.
There could be a leak in the seal for the cabin air vent, which allows fresh air from outside to enter the vehicle.
It could be a small hole in the floor board, allowing water up through the floor from the ground when driving. This is not common, but I have seen it in vehicles that are older, where salt is used on roadways for deicing and along coastal areas.
Check your heater radiator. It is usually mounted behind/near the glove box areas on most cars. It is like a small version of the large radiator that is mounted on the front of your vehicle under the hood. Antifreeze and coolant (does it smell a little like antifreeze?) flows thru your front radiator, thru the block and hoses, and cycles thru the radiator for your heating system. If the radiator is leaking, often it cycles thru the vents on the interior.
Another possibility MIGHT be the AC system and condensation/AC coolant that is building up in/on the lines and transferring thru the vents.
I suspect that the thermostat is stuck which would account for the "sweet smell" of anti freeze. Replace the thermostat and do a drain/fill with the antifreeze to correct the problem.
A car this new should have a warranty right? the only other place for anti-freeze to go is through a blown headgasket into your oil. Pull out your oil dipstick and make sure it is not milky in color. If not check behind the engine and see if any coolant lines going into the firewall are leaking. When inside the car do you smell steaming coolant(anti-freeze) or hear gurgling? The temp gauge that stays on is the overheat indicator?
If you smelled antifreeze, then It just might be the heater core. Check around the floor on the passenger side to see if it is wet. Or, when you start up, do you see any fog like vapour coming out the defrost vent, with any residue on the inside of the windshield. If not this, then put a pressure tester on the rad at 15 lbs. That should show.
The smoke you could be seeing may be steam, your heater inside the vehicle may have a leak and causing steam to rise out of the vents, if you are smelling the steam this is what I suspect. Engine vibration could be a number of things, check the engine mounts to start, one of them is probably broken.
What you Discribe is Indickitive of The HEATER CORE Leaking into the HEAT / EVAPERATOR BOX Adn Can be Corrected By Replacing the Heater Core. PLEASE Reply for Replacement Procedure. Hope this Helps
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