Heater core location and how to replace

Heater core is clogged, heater core valve is stuck closed, air pocket in heater hose circuit.

If it is on the inside of the windshield then you have a heater core leak. To fix this you need to replace the heater core.

If The heater is blowing cold air, it could be either the thermastate is stuck in a closed position and you need a new one, or your heater coil has gone out. The way you determine if this has happened , check to so if water is leaking from under dash on the passenger side. If it is leaking, it's your heater coil..

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It appears you have a leaking heater hose or heater core, which is located behind the engine, and goes from engine to firewall. Check your heater hoses coming from firewall.

either rip the whole dash out, or take it to a shop that will.

Connect the hoses that go to the firewall-this will bypass the core until you can replace it and can be done with a 5/8" pipe and a couple of clanps.

Many people bypass the heater core if it is leaking. It stops the leak but then you have no heat.
The core itself looks like a small radiator and is located inside the big box under the dashboard and isn't very easy to remove. You will need a chilton or haynes manual to guide you through the job or bring it to a shop and have them do it.

a heater uses the temperature of the cars water, running threw a heat exchanger if the heater core has failed water will not circulate threw the engine properly this will and can cause over heating as well as nothing blowing from the heater. good luck.heater cores are generally inexpensive parts to replace.

last thing you can check if heater core is ok. is the thermostat.

how to change a hearter core in a 2002 hyundia elantra?

When I turn my heater on, after my 1993 Jeep Grand Cherokee has warmed up, there is a dusty, watery smell for a few minutes, then it goes away. Also, it doesn't put out as much heat as I think it should. I don't think the heater core has a leak, because I always seem to have the same amount of coolant in the radiator and the heater core is not leaking on the inside of the truck.