Question about 2002 Chevrolet Malibu

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Coolant leaking out

The coolant is coming out of a black drain at back firewall what i think is the air condition unit drain ..it dips all the coolant out of the reservoir and the light comes on inside showing low coolant...the temperature gauge never gets above mid way...please help if you can

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  • scott youngblood Sep 14, 2008

    yes it is coolant and i thought that might be what it is cause you can smell coolant inside the car ...what was puzzling me is how it was coming out of weep drain .....is it hard to fix?

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Are you sure it's coolant and not just water? If it's coolant, then you have a bad heater core. Are you sure it's coming from the weep drain, "drain on firewall." Are you sure there's not a leaky hose elsewhere?

Posted on Sep 14, 2008

  • Steven Brock Sep 14, 2008

    I've done a few of them. It's not really hard, just a pain in the but. You have to remove several components near the glove box, to get it out. I don't know the exact procedure on a malibu. But if you haven't done one before, or don't have alot of mechanical incline, take it in. Doing something wrong will cause the vent controls not to work. Like only vent and no defrost or heater. Or even, not being able to change the setting for the tempature for the vents. It's coming from the weep drain, probally cuz the heater box is full of coolant, getting some into the vents, and into the ac area. Not sure on that though but I could picture it. Oh, and please rate me. Thank you.

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I am experiencing water in the floor in front only, where could it be coming from?


Is this water or engine coolant? If it's water then the Air conditioning condensate drain may be plugged. Water can also enter if the body sealant has dried out where the firewall meets the body at the A post. If it's engine coolant then the heater core is leaking into the air box.

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Open the hood. On the firewall there is an even drain. Usually it's a rubber tube or elbow coming out of the lower part of the firewall und usually under where the a/c lines go through. Use a coat hanger and carefully insert it into the hole and work it around a little. If I'm right water will start to flow out of the drain and silve your problem.

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Removal & Installation

Fig. 1: When installing the new heater core take great care not to bend or damage the fins or tubing
[IMG]http://i665.photobucket.com/albums/vv17/technovative/Isuzu-Pickup-Heater-Core.gif[/IMG]
Click here if image doesn't display.
  1. Disconnect the negative battery cable.
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    When draining engine coolant, keep in mind that cats and dogs are attracted to ethylene glycol antifreeze and could drink any that is left in an uncovered container or in puddles on the ground. This will prove fatal in sufficient quantity. Always drain coolant into a sealable container. Coolant should be reused unless it is contaminated or is several years old.
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  4. Remove the instrument panel.
  5. Disconnect the resistor assembly.
  6. If possible, disconnect and move the duct (non air conditioning) or the evaporator housing (air conditioning) to the right to gain clearance for the heater unit. If equipped with air conditioning, do not disconnect air conditioning system until absolutely necessary. Refer to Section 1 for discharging, evacuating and recharging the system.
  7. Remove the instrument panel stay and heater unit.
  8. Disassemble the heater unit by removing the duct, mode control case, core assembly and heater core. To install:
  9. Assemble the heater unit by installing the duct, mode control case, core assembly and heater core.
  10. Install the heater unit and instrument panel stay.
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  12. Connect the resistor assembly.
  13. Install the instrument panel as outlined in this section.
  14. Connect the heater hoses. Be careful not to damage the core by pulling on the hose.
  15. Refill the engine coolant into a suitable container.
  16. Connect the negative battery cable and check for leaks.

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  1. Disconnect the negative (-) battery cable.
  2. Drain the engine coolant into a suitable container.


CAUTION When draining engine coolant, keep in mind that cats and dogs are attracted to ethylene glycol antifreeze and could drink any that is left in an uncovered container or in puddles on the ground. This will prove fatal in sufficient quantity. Always drain coolant into a sealable container. Coolant should be reused unless it is contaminated or is several years old.
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  2. Remove the instrument panel.
  3. Disconnect the resistor assembly.
  4. If possible, disconnect and move the duct (non air conditioning) or the evaporator housing (air conditioning) to the right to gain clearance for the heater unit. If equipped with air conditioning, do not disconnect air conditioning system until absolutely necessary. Refer to for discharging, evacuating and recharging the system.
  5. Remove the instrument panel stay and heater unit.
  6. Disassemble the heater unit by removing the duct, mode control case, core assembly and heater core.

To install:
  1. Assemble the heater unit by installing the duct, mode control case, core assembly and heater core.
  2. Install the heater unit and instrument panel stay.
  3. Connect the duct (non air conditioning) or the evaporator housing (air conditioning) to the heater unit. Evacuate and recharge the air conditioning system if the system was discharged to remove the evaporator assembly.
  4. Connect the resistor assembly.
  5. Install the instrument panel as outlined in this section.
  6. Connect the heater hoses. Be careful not to damage the core by pulling on the hose.
  7. Refill the engine coolant into a suitable container.
  8. Connect the negative (-) battery cable and check for leaks.

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