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Heater core, I have a v6 3800 Do I have to take the dash out? there looks like a door on the firewall.... can I get to it thru there if I remove the other parts that seem to be in the way......

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Posted on Jan 02, 2017

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SOURCE: heater core on 2005 Silverado

Posted on Dec 11, 2008

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SOURCE: No heat,hot water is going in the heater core,good

it is the blend door actuator. lol i just did one today since here in Houston we had a little cold snap and everyone is realizing that their heater isn't working. The blend door actuator is on the bottom of the heater case and has one plug with 4 or 5 wires. It requires a 5.5mm socket to remove 3 screws and just pull down to release it. Hope this helps.

Posted on Dec 06, 2009

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SOURCE: I am doing a heater

Here is the removal and installation from start to finish...take a look and see where you are at in the steps...

  1. Disable the SIR system, as outlined in this section.
  2. Disconnect the negative battery cable.
  3. Properly drain the cooling system.
  4. Raise and safely support the vehicle.
  5. Detach the heater hoses from the heater core.
  6. Carefully lower the vehicle.
  7. Remove the instrument panel. For details, please refer to the procedure located in Section 10 of this manual.
  8. Remove the DERM with the attaching bracket.
  9. Detach the heater core cover.
  10. Unfasten the heater core mounting clamps, then remove the heater core.

Exploded view of the heater core and related components

To install:
  1. Position the heater core, then secure with the mounting clamps.
  2. Attach the heater core cover.
  3. Install the DERM with the attaching bracket.
  4. Install the instrument panel, as outlined in Section 10 of this manual.
  5. Raise and safely support the vehicle.
  6. Connect the heater hoses to the core.
  7. Carefully lower the vehicle.
  8. Properly refill the engine cooling system and check for leaks.
  9. Enable the SIR system.
  10. Connect the negative battery cable, then start the engine and check for proper system operation and/or leaks.

Posted on Dec 06, 2009

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SOURCE: How do I remove the dash board of a 2003 Impala to replace heater

you don't have to remove the dash to do this job

Posted on Mar 07, 2010

Testimonial: "What a relief, now I must find out how to replace it."

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SOURCE: trying to replace heater core 1994 s10 4 cyl

GM S-Series Pick-ups and SUV's 1994-1999 Repair Guide

1994-97 Vehicles
(see Figure 1)


Fig. 1: Exploded view of a common heater core and case assembly

  1. Disconnect the negative battery cable and properly drain the engine cooling system to a level below the heater core.
  2. Disconnect the heater hoses from the core tubes near the cowl.
The instrument panel carrier is designed not only to provide access to parts through removal of the carrier components, but the carrier will also tilt downward as a complete assembly to allow access from the top. If this is desired, remove the retainer screws along the top and bottom of the carrier assembly (refer to the figure). The instrument panel will then tilt as an assembly into the cab. It is necessary to unbolt and lower the steering column from the carrier to allow for maximum movement of the instrument panel.
  1. The instrument panel must be removed or repositioned for access to the heater core case. Unbolt and either tilt the instrument panel forward or disengage the instrument panel components and remove the panel from the vehicle. In most cases, tilting the panel forward should be sufficient for the necessary access.
  2. Unfasten the heater core rear case retaining screws, then remove the rear case for access to the heater core.
  3. Loosen the retainers and remove the heater core retaining straps.
  4. Remove the heater core and seals.
To install:
  1. Install the heater core and seals, taking care not to damage the core tubes when inserting them through the cowl.
  2. Install and secure the core retaining straps.
  3. Install the rear case and secure using the screws.
  4. Reposition and secure the instrument panel and components. Tighten the cowl screws to 17 inch lbs. (1.9 Nm) and the lower instrument panel screws to 66 inch lbs. (7.5 Nm).
  5. Connect the heater hoses to the core tubes.
  6. Connect the negative battery cable, then properly refill the engine cooling system.
  7. Run the engine at normal operating temperature, then check for leaks.

Good luck (remember rated this post).

Posted on May 19, 2010

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No heat,hot water is going in the heater core,good

it is the blend door actuator. lol i just did one today since here in Houston we had a little cold snap and everyone is realizing that their heater isn't working. The blend door actuator is on the bottom of the heater case and has one plug with 4 or 5 wires. It requires a 5.5mm socket to remove 3 screws and just pull down to release it. Hope this helps.

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Once again you have an ALL DAY JOB ahead of you. YES, You have to remove the "whole dash".

However, Sometimes you can get LUCKY and only unbolt it without pulling all the wires and cables and junk and it will come back just far enough to be able to remove the heater box.

NOTE: I have found that on SOME Ford models.,:

They install the heater core in the interior plastic housing and mount it on the firewall with the studs protruding thru the firewall then they put on the NUTS from the engine compartment side onto the bolts to hold the assembly onto the firewall.

Then when they mount the engine compartment housing OVER these same studs that protrude thru the firewall and then they install a SECOND NUT to hold the firewall compartment on.

So you have 2 nuts on the same bolt. Therefore you have to take the engine compartment side housing side off FIRST and then you will see the set of NUTS that hold the interior housing onto the firewall,

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When I replaced the heater core on my 95 Suburban, I seem to remember having to disconnect the A/C lines on the firewall for the evaporator. There were also several nuts to remove on the engine firewall side from studs on the heater box that pass thru the firewall. It is definately a lot of work.

Good luck.

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