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Re: heater core location and how to replace
Its dead center in front of the console under the dash. there is a bunch of plastic pannels you need to remove as well as the console. You will need a manual to guide you through it...it is a pain in the **** to do and too long to write everything here.
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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..
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.
In the engine bay on the passenger side against the firewall. Follow that which should lead to 2 nipple fittings or 2 tubes where the hoses connect to the engine. Replace the hoses when you replace the heater core. If you try to replace the hoses later, you may break the fittings at the heater core because they have minimal flexibility.**Please rate me on this answer**
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.
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.