Question about 2001 GMC Sierra 1500HD

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Heater core compression fitting removal! is there a tool?

I am having to replace the heater core compression fitting but am unable to remove the old one is there a tool for this? is there anyplace i can find the replacement fitting aside form the dealer?

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  • jrainey Jan 11, 2009

    yup that's the one, on the engine side of the firewall plastic the male part broke off. and I have to replace the fitting. but am un able to uncouple the fitting. I also need to find the replacement, I assume they have one at the dealership but it is Sunday?

  • jrainey Jan 11, 2009

    is there a tool to remove the old compression fitting?

  • jrainey Jan 11, 2009

    swueeze how it looks like it is a male to female coupler that when compressed they seal the adaptor.

  • jrainey Jan 11, 2009

    yes the plastic hose adapter that connects to the metal heater core stem, not the clamp that connects to the hose to the adapter. am I missing something?

  • work4it1 May 11, 2010

    are you talking about the plasit piece that hooks up to the core on the out side of the truck ?

  • Anonymous Mar 29, 2014

    how to remove the dash for heater core repairs

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  • 196 Answers

Try a bigger parts house if its the part in thinking of nanp has them

Posted on Jan 11, 2009

  • 2 more comments 
  • work4it1 Jan 11, 2009

    If im picturing the right thing no they should just squeeze together and come off but they dont allways work that way try a little screw driver to get the plastic clip to release

  • work4it1 Jan 11, 2009

    If im picturing the right thing no they should just squeeze together and come off but they dont allways work that way try a little screw driver to get the plastic clip to release

  • work4it1 Jan 11, 2009

    If im picturing the right thing no they should just squeeze together and come off but they dont allways work that way try a little screw driver to get the plastic clip to release

  • work4it1 Jan 11, 2009

    yup the part that will come off the heater core should be black with a white plastic clip type of thing there should be two little tabs you can push in on to realease it. but then again they may have changed them but it sounds like the original coupler to me

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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.
f74-01.gif 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.
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  • 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.

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2 Answers

Need to replace the heater core


Inspect/Replace 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.
f74-01.gif 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.
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To Install:
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