Need location of heater core on '98 chevy malibu v-6 3100

Find a core plug that provides access. Drain cooling system. Remove core plug. Install heater. Refill cooling system and bleed air out of it

Entire dashboard has to be removed. Ac system may have to be discharged in order to replace heater core. Probably a 10 to 12 hour job.

First thing to look at is coolant level. It sounds like the coolant pump will push coolant to the heater core and then stops pumping because it has air because to low. If coolant level is full, the vanes on the coolant pump might be spinning on the shaft, in which case you will have to replace the pump.

Hello
Your going to need a heater core,this is located in the heater fan box under the dashboard.
Possibly may be found mounted to the firewall under the hood.

Let it cool down before attempting any repairs.Another possibility is a broken hose at the heater core.

If it is necessary to remove the heater assembly, the cooling system must be drained before removing the heater core.
When a heater core leaks, a new heater core is installed or the old one repaired.
Heater Housing

• The heater housing is usually under the dash and must be removed to gain access to the heater core.
• Procedures for replacing the heater core vary with the year, make, and model of car. It threfore necessary to consult the manufacturer's repair manuals for the proper procedure for replacement.

The heater housing is disassembled to get to the heater core. Heater Core

• Remove the access panels(s) or the split heater/air conditioning case to gain acess to the heater core.
• Remove the heater coolant hoses.
• Remove the cable and/or vacuum control lines (if equipped).
• Remove the heater core securing brackets and/or clamps.
• Lift the core from the case. Do not use force. Take care not to damage the fins of the heater core when removing.
• To reinstall the heater core, reverse the removal steps.

When the heater core leaks and must be repaired or replaced, it is a very difficult and time-consuming job primarily because of the core's location deep within the firewall of the car. For this reason always leak test a replacement heater core before installation.

http://www.ehow.com/how_6021425_replace-core-98-chevy-pickup.html

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This should help

The only easy way to change a heater core is to have someone else do it.

A heater core is located behind the dash on the passenger side. If you look under the hood you will see 2 heater hoses going to the fire wall again, on the passenger side, your heater core is located behind the hoses. You will need to take the dash loose or off to get to the air box the heater core rides in.

Before starting this job I would get a repair manual. This is not a easy job, 6+ hours for an experienced tech with all of the right tools. And you may have to discharge and recharge the AC system.

Going to your local public Library would be best at this point.
Also,,i should warn you that replacing the heater core is a difficult job for someone inexperienced, and even when you know what you are doing, it is difficult.