Radiator coolant fumes inside cabin - 2000 Ford Expedition

You need to repair the exhaust/manifold leak. Possibly a blown gasket.

the cabin heater unit is inside the car just behind the dashboard. It is an extension of the car cooling system using the hot water that normally cools the engine to heat the cabin. However it is just like the radiator at the front of your car and can develop leaks, and therefore the coolant runs into the cabin

Hi Dennis, If you're sure that the coolant is leaking from the radiator, replace it. If the cooling system is leaking somewhere else, have the cooling system inspected by asking for a cooling system pressure check. After locating the source of the problem attend as required. Areas of interest are 1) The radiator. 2) Radiator pressure cap. 3) Broken or cracked hoses or leakages from where each fits. 4) Water pump 5) Core plugs fitted into engine block and cylinder head. 6) Cabin climate system. (Radiator inside cabin of vehicle) Keep me informed as to your progress. Regards John

It sounds like a heater cord problem .The heater cord is basiclly a small radiator on the inside of the cabin .On older vehicles sediment tends to fill it up so less coolant can flow through it their for less heat can transfer from the engine witch is the source of the heat into the cabin .Some vehicles also have a gate valve or ball valve that turns and shuts off the coolant flow the from the water pump witch drives the coolant every ware it needs to be in the entire system your control inside the cabin opens and closes this valve to let coolant into the heater core if you even have this valve .The best way to tell if the heater core is flowing is to warn the vehicle up to operating temp look for the 5/8 heater hoses going to the left side of the fire wall there will be 2 of them 1 is in 1 is out .One side should be much cooler with the heat on full if not its the core or the valve if you have one .

if loosing coolant but no leaks anywhere inside or outside of car, and if it overheats due to lost coolant, we can say that your cylinder head has a micro crack on it. and coolant is vaporized inside chamber. you need to weld (or replace) cylinder head after removing it.

Most likely, if it was installed at the dealership, you don't have a block heater, but a oil pan heater. To verify, look under the car, at the oil pan. Is there a pad siliconed to the oil pan?

If you DO have a block heater, it should be on the drivers side portion of the engine.

Hello dedunwoodie.
Your heater core is beginning to leak coolant.
As the fan blows through it it is picking up the liquid and depositing it on your windshield.
It will need to be replaced to solve your problem.

possible bad heater core

is the car on recirculate or fresh air? air from your aircon comes through the bottom of your front windscreen, make sure its clear and free of leaves or anything that can cause blockage to stop it from become damp inside the aircon ducts. if it is definately petrol fumes you may have an exhaust leaking from your engine bay, releasing the fumes into your cabin, that is the most common reason for petrol fumes in your aircon.