Heater core removal

Tiny
AJKSSNOW
  • 2000 CHEVROLET SILVERADO

Heater problem V8 Four Wheel Drive Automatic

My Silverado is the 5.3 newer body style how do I remove the heater core? Step by step with photos if available Our truck is a C1500 Silverado 4 x 4 with the 5.3L engine. The 8th diget of the vin is a "T" as in Tom. It has 131,000 miles on it and I don't know if it is original but assumed it is.

The reasons I believe it needs changed is.

I have no heat so I checked the following.

I have inspected the modulator motor and shaft that controls the baffle for movement and the do move. I turn full hot and it moves, fully cold and it moves and medium heat and it moves half way back.
I have also checked the temp guage of the truck while running and it runs in the area of 200+ deg-F. And stays there.
I checked the heater hoses to the heater core and one side is hot and the other hose is not. It is just a bit above room temperature.

I plan to get some hoses and try to back flush it to see if I can get anything out of it and if that helps but, I plan to keep this truck for a long time and do not want to be in a situation where I need heat and it goes out again. So I plan to replace the core and would like to know the proper sequance with any pics or diagrams that may help me.

Thanks for your support,
Allen

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Saturday, December 13th, 2008 AT 1:52 PM

62 Replies

Tiny
IMPALASS
  • EXPERT
  • 3,127 POSTS

Hi Allen,

You will need to discharge and recharge the air conditioner first here is a guide to help you do that.

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

Here is a guide to give you an idea of what you are in for when doing the job.

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

(There is a complete diagram set for replacing the heater core below)

Just for info are you running Prestone, green coolant? Only reason I ask is if you were running the Dex-Cool.......it has a tendency to gum up in the heater/radiator cores.....

REMOVAL PROCEDURE


http://www.2carpros.com/forum/automotive_pictures/248015_1_110.jpg



Drain the engine coolant. Refer to Draining and Filling Cooling System in Engine Cooling.
Disconnect the heater hoses.
Disconnect the temperature control cable from the heater/ventilation module.
Disconnect the mode control cable from the heater/ventilation module.
Remove the instrument panel (IP) carrier (2).
Disconnect the electrical harnesses and the ground connections as necessary.


http://www.2carpros.com/forum/automotive_pictures/248015_2_59.gif



Remove the heater/ventilation module mounting nuts and the screws.
Remove the heater/ventilation module assembly. Set the module assembly on a bench.
Remove the heater core cover screws.


http://www.2carpros.com/forum/automotive_pictures/248015_3_39.gif



Remove the heater core cover.


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Remove the heater core.

INSTALLATION PROCEDURE


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Install the heater core.


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Install the heater core cover. NOTE: Refer to Fastener Notice in Service Precautions.
Install heater core cover screws. Tighten Tighten the screws to 1.6 N.m (14 lb in) .
Install the heater/ventilation module assembly to the vehicle.
Install the heater/ventilation module mounting nuts and the screws. Tighten
Tighten the screws to 4 N.m (35 lb in) .
Tighten the nuts to 9 N.m (80 lb in) .


http://www.2carpros.com/forum/automotive_pictures/248015_7_8.gif



Connect the electrical harnesses and the ground connections as necessary.
Install the instrument panel carrier (2).
Connect the mode control cable to the heater/ventilation module.
Connect the temperature control cable to the heater/ventilation module.
Connect the heater hoses.
Refill the engine coolant. Refer to Draining and Filling Cooling System in Engine Cooling.

(Check out the heater core diagrams below)

Please let us know if you need anything else to get the problem fixed.

Cheers

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+4
Saturday, December 13th, 2008 AT 9:33 PM
Tiny
AJKSSNOW
  • MEMBER

My fluid is the orange type. Once done I will let you know the results.

I do have a couple of additional questions on the data you sent me.

1) Is there more information as to what the numbers mean on the schematic? I see the drawing is showing these but nothing to reference them to.

2) If I am understanding this correctly it appears that I need to take the entire heater/A/C module out. If so, this information is very vauge and if possible is there a manual I can get that gives much more details? Is there a manual with pictures of the objects being removed? If so where may I purchase it at? I guess I am looking for a specific book on my truck and not a range of years that show general information.

Thanks again,
Allen

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Saturday, December 13th, 2008 AT 11:02 PM
Tiny
IMPALASS
  • EXPERT
  • 3,127 POSTS

Allen

We see tons of problems with the orange, Dex-cool..plugs radiators also

The data .the numbers must be from another pic that the manual uses the only number the pic uses it #2

I have attached that for you......the module removal / installation

More detailed well. there is a link I attach below and here Find a car repair manual for your car repair questions. That you can purchase a manual

You might see if that is what you want

If not detailed enough what you may be wanting is the actual service manual I have a 1995 Impala SS and purchased the entire service manuals for this price.but I have detail.

HEATER/VENT MODULE REPLACEMENT

REMOVAL PROCEDURE


http://www.2carpros.com/forum/automotive_pictures/248015_21_1.jpg



Drain the engine coolant. Refer to Draining and Filling Cooling System in Cooling System.
If equipped remove the auxiliary battery.
Disconnect the heater hoses.
Remove the accumulator.
Remove the instrument panel carrier.
Remove the HVAC module drain hose.
Disconnect the electrical harnesses and the ground connections as needed.


http://www.2carpros.com/forum/automotive_pictures/248015_22_1.jpg



Remove the mounting nuts and the screws from the HVAC module.
Remove the HVAC module assembly from the vehicle.

INSTALLATION PROCEDURE


http://www.2carpros.com/forum/automotive_pictures/248015_23_1.jpg



If you are replacing the HVAC module, transfer the components from the old HVAC module as necessary.
Install the HVAC module assembly to the vehicle. NOTE: Refer to Fastener Notice in Service Precautions.
Install the mounting nuts and the screws to the HVAC module.
Tighten

Tighten the mounting screws to 4 N.m (35 lb in) .
Tighten the mounting nuts to 9 N.m (80 lb in)


http://www.2carpros.com/forum/automotive_pictures/248015_24_2.jpg



Connect the electrical harnesses and the ground connections.
Install the HVAC module drain hose.
Install the instrument panel carrier.
Install the accumulator.
Connect the heater hoses.
Install the auxiliary battery.
Fill the cooling system. Refer to Draining and Filling Cooling System.

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Sunday, December 14th, 2008 AT 2:22 AM
Tiny
LARRY
  • 2000 CHEVROLET SILVERADO
  • 41,700 MILES

Would like to replace the heater core in this truck

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Thursday, November 16th, 2017 AT 12:47 PM (Merged)
Tiny
ASEMASTER6371
  • EXPERT
  • 25,476 POSTS

Here are some pictures of the core. The instrument cluster must be removed to gain acess to the case assembly. It pays 6.5 hours in the book plus evac and charge the ac.

Roy

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Thursday, November 16th, 2017 AT 12:47 PM (Merged)
Tiny
WOLFENPIXELS
  • MEMBER

Ok remove dash and instrument panel as suggested. Then Service Information
Home Publications Number Search New Bulletins Bulletin Search Feedback Help

2000 Chevrolet C Silverado - 2WD | Sierra, Silverado,
Heater Core Replacement
Removal Procedure
1. Drain the engine coolant. Refer to Cooling System Draining and Filling in Engine Cooling.
2. Recover the refrigerant. Refer to Refrigerant Recovery and Recharging.
3. Remove the heater/vent module. Refer to Heater/Vent Module Replacement.
4. Remove the heater core cover screws.

Object Number: 363771
Click here for detailed picture of above image.
5. Remove the heater core cover.

Object Number: 363772
Click here for detailed picture of above image.
6. Remove the heater core.
Installation Procedure

Object Number: 363772
Click here for detailed picture of above image.
1. Install the heater core.

Object Number: 363771
Click here for detailed picture of above image.
2. Install the heater core cover.

Notice: Refer to Fastener Notice in Cautions and Notices.
3. Install heater core cover screws.

Tighten
Tighten the screws to 1.6?N m (14?Lb?In).
4. Install the heater/vent module. Refer to Heater/Vent Module Replacement.
5. Recharge the A/C system. Refer to Refrigerant Recovery and Recharging.
6. Refill the engine coolant. Refer to Cooling System Draining and Filling in Engine Cooling.
2. If equipped remove the auxiliary battery. Refer to Battery Replacement in Engine Electrical.
3. Disconnect the heater hoses. Refer to Heater Hoses Replacement.
4. Remove the accumulator. Refer to Air Conditioning Accumulator Replacement.
5. Remove the instrument panel carrier. Refer to Instrument Panel Carrier Replacement in Instrument Panel, Gauges and Console.
6. Remove the HVAC module drain hose.

Object Number: 499156
Click here for detailed picture of above image.
7. Disconnect the electrical harnesses and the ground connections as needed.

Object Number: 363009
Click here for detailed picture of above image.
8. Remove the mounting nuts and the screws from the HVAC module.
9. Remove the HVAC module assembly from the vehicle.
Installation Procedure

Object Number: 363009
Click here for detailed picture of above image.
1. If you are replacing the HVAC module, transfer the components from the old HVAC module as necessary.
2. Install the HVAC module assembly to the vehicle.

Notice: Refer to Fastener Notice in Cautions and Notices.
3. Install the mounting nuts and the screws to the HVAC module.

Tighten
Tighten the mounting screws to 4?N m (35?Lb?In).
Tighten the mounting nuts to 9?N m (80?Lb?In).

Object Number: 499156
Click here for detailed picture of above image.
4. Connect the electrical harnesses and the ground connections.
5. Install the HVAC module drain hose.
6. Install the instrument panel carrier. Refer to Instrument Panel Carrier Replacement in Instrument Panel, Gauges and Console.
7. Install the accumulator. Refer to Air Conditioning Accumulator Replacement.
8. Connect the heater hoses. Refer to Heater Hoses Replacement.
9. Install the auxiliary battery. Refer to Battery Replacement in Engine Electrical.
10. Fill the cooling system. Refer to Cooling System Draining and Filling
hope that helped and yes im a gm mechanic:)

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Thursday, November 16th, 2017 AT 12:47 PM (Merged)
Tiny
GJCON4
  • 2000 CHEVROLET SILVERADO

Heater problem
2000 Chevy Silverado 6 cyl Four Wheel Drive Manual 155500 miles

DO I NEED TO COMPLETELY REMOVE THE DASH TO REPLACE THE HEATER CORE IN A 2000 SILVERADO PU V6 4.3 NO AC.

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Thursday, November 16th, 2017 AT 12:47 PM (Merged)
Tiny
GJCON4
  • MEMBER

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Thursday, November 16th, 2017 AT 12:47 PM (Merged)
Tiny
ULLOAJOSE97
  • 2000 CHEVROLET SILVERADO
  • 100,000 MILES

I need to get my heater core changed

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Thursday, November 16th, 2017 AT 12:47 PM (Merged)
Tiny
BILLYMAC
  • EXPERT
  • 2,240 POSTS

We charge labor from flat rate manual. How ever hours it say's the job is. Then we add parts and sales tax.

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Thursday, November 16th, 2017 AT 12:47 PM (Merged)
Tiny
MTBELCHER
  • 2000 CHEVROLET SILVERADO

Heater problem
2000 Chevy Silverado V8 Four Wheel Drive Manual 140000 miles

yes I was neding to find out how to go about removing and replacing the heater core in my chevrolet truck. I wasn't sure if I nedded to start by removing the dash or where. Appreciate your help
tracy belcher

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Thursday, November 16th, 2017 AT 12:47 PM (Merged)
Tiny
BLUELIGHTNIN6
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Thursday, November 16th, 2017 AT 12:47 PM (Merged)
Tiny
TURKEY2
  • 2000 CHEVROLET SILVERADO
  • 75,000 MILES

I have a 2000 Chevy Silverado 1500 with a 5.2 auto that I m having heating problems. Last summer I think I may have added some green antifreeze to the Dexcool that was in it. I had to change out the water pump, thermostat, and radiator. I flushed out the whole system several times and also the heater core. I didn t change the heater core because when I hooked the water hose to it there was lots of water came out and it seemed clean. I didn t go back with the Dexcool simply because of the hype you see on the internet about it and I ve been using green for nearly 40 years without any problems. I used the Wal-Mart brand that says it compatible with either one but it is green. I mixed half with water like I should and the temp did fine all summer. Now that the outside temp had cooled down for winter it won t get above 175 deg and it takes forever for it to get to that. I change out the thermostat and didn t change anything. Checked to temp of the motor with a thermometer and it read the same as the gauge. The heater core is working fine cause when it finely get up to the 175 it heats pretty good. The hose going into the top of the radiator from the motor is hot and the bottom hose going to the water pump is cold. I cut two pieces of cardboard an put them in front of the radiator and it worm up to normal temp but it still took forever. The thermostat must be working because when the gauge got to the right temp it didn t get any hotter. Do you have any idea?? Nelson

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Thursday, November 16th, 2017 AT 12:47 PM (Merged)
Tiny
HMAC300
  • EXPERT
  • 49,757 POSTS

What temp is the thermostat? It shold be a 195 degree stat. You probably have aone taht is 160 or so

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Thursday, November 16th, 2017 AT 12:47 PM (Merged)
Tiny
IWH
  • 2000 CHEVROLET SILVERADO

Heater problem
2000 Chevy Silverado 6 cyl Two Wheel Drive Automatic

How to change heater core

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Thursday, November 16th, 2017 AT 12:47 PM (Merged)
Tiny
DR LOOT
  • EXPERT
  • 2,313 POSTS

Is not an easy operation you will need to purchase yourself a manual and follow the instructions, and if you run into any trouble during the operation let me know I will answer your question

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Thursday, November 16th, 2017 AT 12:47 PM (Merged)
Tiny
SPNHRG
  • 2000 CHEVROLET SILVERADO

Heater problem
2000 Chevy Silverado V8

I have a 2000 chevy silverado 2500hd series Does the whole dash need to come out and the refrigerant need to be drained from the a/c to remove and replace the heater core. I know all other coolants need to be drained, just never seen one where the a/c condensor had to be removed.

Also if you have any pictures or diagrams on this I would really appreciate you sending them along with your answer.

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Thursday, November 16th, 2017 AT 12:47 PM (Merged)
Tiny
BLUELIGHTNIN6
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Thursday, November 16th, 2017 AT 12:47 PM (Merged)
Tiny
TOMAS60
  • 2000 CHEVROLET SILVERADO

Heater problem
2000 Chevy Silverado V8 Four Wheel Drive Automatic 175000 miles

Do you have to remove a/c refridgerent to change out heater core

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Thursday, November 16th, 2017 AT 12:47 PM (Merged)
Tiny
BMRFIXIT
  • EXPERT
  • 19,460 POSTS

1st step in directions on how to remove and replace heater core is (Recover the refrigerant (on A/C equipped vehicles only)).
So to answer your question is yes
good luck
let me know if need more help

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