Heater core replacement

Tiny
ANONYMOUS
  • MEMBER
  • 2005 CHEVROLET SILVERADO
  • 13,000 MILES
How do you take out the heater core on a 2005 Silverado 2500 HD
Friday, November 9th, 2012 AT 5:05 AM

11 Replies

Tiny
CJ MEDEVAC
  • EXPERT
These videos are a little rough to watch but they do the job, check out the diagrams below for installation in the post below this one.

https://www.youtube.com/results?search_query=2005+silverado+2500HD+HEATER+CORE

THE MEDIC
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Friday, November 9th, 2012 AT 5:27 AM
Tiny
KEN
  • ADMIN
You will need to discharge and recharge the air conditioner as well, here is a link for that

https://www.2carpros.com/articles/re-charge-an-air-conditioner-system

Here are the core replacement instructions.

Heater core replacement replacement general guide.

https://www.2carpros.com/articles/replace-heater-core

Tools Required

J 43181 Quick Connect Connector Removal Tool

Removal Procedure

Drain the engine coolant. Refer to Draining and Filling Cooling System (w/RPO HP2) or Draining and Filling Cooling System (w/o RPO HP2) in Engine Cooling.
If equipped remove the auxiliary battery. Refer to Battery Replacement - Auxiliary in Engine Electrical.
Using the J 43181 disconnect the inlet heater hose from the heater core.
Install the J 43181 to the heater core pipe.
Close the tool around the heater core pipe.
Firmly pull the tool into the quick connect end of the heater hose.
Firmly grasp the heater hose. Pull the heater hose forward in order to disengage the inlet hose from the heater core.
Fig 1: Identifying Heater Hose To Heater Core Fittings
GM362171
Courtesy of GENERAL MOTORS CORP.
View Full-Screen
Using the J 43181 disconnect the surge tank outlet hose from the heater core.
Install the J 43181 to the heater core pipe.
Close the tool around the heater core pipe.
Firmly pull the tool into the quick connect end of the heater hose.
Firmly grasp the heater hose. Pull the heater hose forward in order to disengage the surge tank outlet hose from the heater core.
Remove the accumulator. Refer to Accumulator Replacement .
Remove the instrument panel carrier. Refer to Instrument Panel (I/P) Carrier Replacement in Instrument Panel, Gages and Console.
Remove the HVAC module drain hose.
Disconnect the electrical harnesses and the ground connections from the HVAC module.
Remove the nuts (4) from the HVAC module (2).
Fig 2: HVAC Module
GM810832
Courtesy of GENERAL MOTORS CORP.
View Full-Screen
Remove the bolts (3) from the HVAC module (2).
Remove the HVAC module (2) from the vehicle (1).
Installation Procedure

If replacing the HVAC module, transfer the components from the old HVAC module as necessary.
Fig 3: HVAC Module
GM810832
Courtesy of GENERAL MOTORS CORP.
View Full-Screen
Install the HVAC module (2) to the vehicle (1).
NOTE: Refer to Fastener Notice in Cautions and Notices.
Install the nuts (4) to the HVAC module (2).
Tighten: Tighten The Nuts To 9 N.M (80 Lb In).

Install the bolts (4) to the HVAC module (2).
Tighten: Tighten The Bolts To 4 N.M (35 Lb In).

Connect the electrical harnesses and the ground connections.
Install the HVAC module drain hose.
Install the instrument panel carrier. Refer to Instrument Panel (I/P) Carrier Replacement in Instrument Panel, Gages and Console.
Install the accumulator. Refer to Accumulator Replacement .
Install the surge tank outlet hose to the heater core.
Firmly Push The Quick Connect Onto The Heater Core Pipe Until You Hear An Audible Click.

Fig 4: Removing/Installing Heater Hose To Engine
GM363237
Courtesy of GENERAL MOTORS CORP.
View Full-Screen
Install the inlet heater hose to the heater core.
Firmly Push The Quick Connect Onto The Heater Core Pipe Until You Hear An Audible Click.

Fill the cooling system. Refer to Draining and Filling Cooling System (w/RPO HP2) or Draining and Filling Cooling System (w/o RPO HP2) in Engine Cooling.

Check out the diagrams (Below). Please let us know if you need anything else to get the problem fixed.

Cheers, Ken
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Wednesday, October 19th, 2016 AT 9:49 AM
Tiny
LEE K 41
  • MEMBER
  • 2005 CHEVROLET SILVERADO
  • 133,000 MILES
Need some help!
Just replaced the heater core and what a job that was pulling the dash out.
Got it all back together and now when the hvac controls are in the cold position it blows hot and when is in the hot it blows cold. This is not a digital unit. I have done all resets that I have been able to find and ask about from pulling the all fuses, not touch the unit for 10 minutes for system to do a reset, took + and - off the battery for 10 minutes still the same out come.
Please any help would be great
Thanks
Lee
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Tuesday, January 29th, 2019 AT 2:25 PM (Merged)
Tiny
ASEMASTER6371
  • EXPERT
The connector for the blend door motor. Is it on correctly?

Roy
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Tuesday, January 29th, 2019 AT 2:25 PM (Merged)
Tiny
LEE K 41
  • MEMBER
It only plugs in one way right?
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Tuesday, January 29th, 2019 AT 2:25 PM (Merged)
Tiny
MY420
  • MEMBER
  • 2002 CHEVROLET SILVERADO
  • V8
  • 2WD
  • AUTOMATIC
  • 128,000 MILES
I just had they heater core replaced on my truck, and now my AC doesn't blow cold air. Could something have been done during the installation that would have affected the AC unit of my truck?
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Tuesday, January 29th, 2019 AT 2:25 PM (Merged)
Tiny
DOCFIXIT
  • EXPERT
Yes AC is discharged during removal of dash. Maybe they overlooked to recharge.
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Tuesday, January 29th, 2019 AT 2:25 PM (Merged)
Tiny
BDIDDYT
  • MEMBER
  • 2002 CHEVROLET SILVERADO
  • 150,000 MILES
I have dash copleatly apart, can not find out how to git in to big black housing to git at the core. Please help need to replace as soon as posible before I forgit how to put the dash backtogether. Lol
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Tuesday, January 29th, 2019 AT 2:25 PM (Merged)
Tiny
DRCRANKNWRENCH
  • EXPERT
The big black box under the dash is generally held together with clips around the periometer where the two halves come together. Disonnect the hoses at the firewall and you will see a nut very close to them. This retains the heater core and must be removed. Be careful with adjuster/vacuum/electrical connecters that actuate the doors and if they are cables take note of their position. Also make sure the A/C drip hose does not get kinked with all the pulling stuff around.
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Tuesday, January 29th, 2019 AT 2:25 PM (Merged)
Tiny
MTTHWPATRICK1
  • MEMBER
  • 2003 CHEVROLET SILVERADO
Heater problem
2003 Chevy Silverado V8 Four Wheel Drive Automatic

i need to replace the heater core and want to know if the dash has to come off to remove heater box
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Tuesday, January 29th, 2019 AT 2:25 PM (Merged)
Tiny
DOCFIXIT
  • EXPERT
Yes dash needs to be removed to remove HVAC
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Tuesday, January 29th, 2019 AT 2:25 PM (Merged)

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