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'06 2500HD Heater Core???

Discussion in 'Chevy Trucks' started by MikeRi24, Jan 5, 2014.

  1. MikeRi24

    MikeRi24 Senior Member
    Messages: 563

    My employee that drives my 2006 2500HD 6.0 gas told me that he noticed some problems with the heat in the truck. He said that when he lets the truck idle to warm up, the heat doesn't work even when the temp gauge reads 210 but when he starts driving it the heat comes on full blast but any time it sits idle it won 't blow hot air. He also said that once and a while he gets a faint smell of coolant. We checked the coolant level and it was about a quart low so we filled it up. I have never had to add coolant to the truck since I've owned it. Does the heater core sound like the culprit here? if so how difficult of a job is that?
  2. MikeRi24

    MikeRi24 Senior Member
    Messages: 563

    anyone have any suggestions???
  3. hammerstein

    hammerstein Senior Member
    Messages: 318

    I would start with a water pump.
  4. Jakedaawg

    Jakedaawg Senior Member
    from N. Mi
    Messages: 134

    Did you have a t-stat or any cooling system work done? Sounds more like air in the system.
  5. JAJA

    JAJA Member
    Messages: 73

    I have had similar problem with my 03 1/2 ton 5.3 I did a new water pump and t state and flushed the cooling system really good that was last winter and have had no problems since
  6. chachi1984

    chachi1984 Senior Member
    Messages: 416

    my 02 does something like that, sometimes I start up the truck and it wont blow any air. then all of a sudden it will kick on.
    I pretty sure it could be the heater resistor when I wiggle the plug it always kicks on
  7. kg26

    kg26 Senior Member
    Messages: 314

    I just had my water pump and tstat replaced two days ago on my 2k 1/2 silverado. when I let the truck warm up it blows hot when I drive the air cools down my guess is like mine its your heater core.
  8. damian

    damian Senior Member
    Messages: 330

    i would pressure test the cooling system and confirm where the leak is coming from,especially since heater core replacement in that truck is no fun:A\C discharge the steering column and dash comes out then the hvac case comes out then apart.A center console adds to the fun. If I havent done one in a while it takes me a long day to do a perfect job, that means every nut ,bolt and clip back in its place , no cheating, no rattles.
  9. chevboy167

    chevboy167 Member
    Messages: 96

    You may have a bigger problem than you think! Pull the resistor and blower motor wiring plugs apart and look at them carefully. They may be melted and/or burnt on the terminals inside the plastic retainer. I have re-pigtaled many for this! Worse case is a truck fire.... nobody needs that!!! Let us know what you find.