Question about 1990 Chevrolet Suburban

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Replace the heater core - 1990 Chevrolet Suburban

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If you don't live in a place where you need the heat, you can bypass the heater core all together. Take both hoses loose from the heater core, which should be located to the left of your evaporator (the black box that mounts to the firewall and connects to your a/c accumulator. (the aluminum thing) by taking two hose clamps and a spark plug socket, you can combine the two lines together, which bypasses the heater core. I would recommend shortening the line coming from the radiator before connecting. The spark plug socket will serve as a connector or modifier to go between the smaller line and the larger.

Posted on Oct 17, 2008

  • Mr D 427 Oct 17, 2008

    If you are going to replace the heater core, you are going to want to make sure you have some free time. The task itself is by no means easy. There are three nuts on the outside firewall that need to be loosened first and formeost to even begin the process. These bolts are located around the evaporator box (a.k.a. black thing connected to the aluminum accumulator) the first will be to the top right of the box, if you have a factory under hood lamp, this nut will be on a stud directly below it. The next will be directly below the box and to the right, and the last will be to the left side beneath the box. If you can see one, you will see the other. (Note: The bottom two studs are located in a position where you may not see them topside of the vehicle. I loosened the inner fender well to access them from the bottom due to space constraints. Be careful when loosening the nuts not to torque too hard. Bear in mind that the studs are likely factory and could potentially have rust rot. I snapped one of the three in the removal process.) Once you have removed these nuts, you are ready to start on the inside.



    The first step here is to remove the glove box. With this out of the way, you will have access to the heater core/ air control box.(ACB) Start removing the duct work (note: If you have a console, you may wish to loosen or remove it to allow easier access to duct work.) There are three screws that allow the removal of the main juncture. This will be on the left as you are looking into the glove box area. If your vents work well, It is not necessary to remove the ductworking that goes beneath the dash to operate the driver vents, it will come apart seperatley from the junction duct. If not, this is the perfect opportunity to use some ductape to seal up any gaps that cause a loss of air preassure. Once the ductworking is out of your way, you will have the clearance necessary to remove the heater core. To the right hand side of the ACB (air control box) There will be a bolt, its head size will be a ten millimeter and it will be serving as a cable/ wire hanger. Remove this bolt before trying to remove ACB. Once removed, I would recommend pulling the corner of your carpet back to allow easier removal of ACB. (note: It will be sticky at first, but jiggle it a little and it'l come loose.) Once you have removed the ACB from the firewall, its time to disconnect those cables and lines. There will be three vaccum lines attached to the ACB, one on the left and two in the middle. They are easy to remove, but do so with attention to detail as to the way the lines go on. They have small loops in the connector part of the line that allow for a more secure connection. Once you have removed the vaccum lines, remove the control cable assembly as well. It will be connected with 3 screws, head size 1/4. (If you have a driver that allows interchanging heads {i.e. phillips, regular, hex) use the driver without any bit. It is the perfect size. Once you have removed all connecting items from the ACB, you will be able to completely remove it from the vehicle. I reccomend using caution when doing this as the old heater core will likely still have some anti freeze in it.



    Now you're on the home stretch. Hope you kept that driver handy as it will be needed for around twenty more screws. Where the ACB meets the firewall, there are four screws. Looking at this section from the top, two of the screws are on the right hand side over the encasment for the heater core and two are hidden beneath the foam strip on the left. ONce these are removed, you will see several screws on the left side of the box. You will need to remove all of them. Once these are removed it will allow you the necessary clearance to disconnect the vaccum from the door it controls from the inside.( Note: the vaccum is the saucer looking thingy, and the one in the middle is the one I'm referring to.) Once you remove this screw, which i believe is either a 3/8 or 7/16, you will need to remove the mechanism that opens and closes the heater door. Its fairly simple. There will be a clip that attaches this mechanism to the vaccum door operating mechanism. open the clip, without breaking it, move the mechanism out of the way, and remove the rod. After this has been done, you should be able to seperate the heater core assembly from the box. There will be a spring loaded clip that holds the heater core in on its left side and a crossmember on its right side. The clip is held in by one screw, the corssmember by two. Take these off, remove the old heater core and put the new one in its place. Be sure to properly secure the spring and the crossmember, as you will be unable to remount the ACB to the firewall if the heater core is in the wrong position.



    I'm sure that you will be able to put everything back together so the only thing further I can advise is that when you go to remount the ACB to the firewall, make sure you line up all the holes. Use that ten millimeter sized bolt to hold the ACB in place while you line the rest up. After this, its just putting humpty dumpty together again.

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1 Answer

Can hear water when running.


can be clogged heater core,try inspecting the heater core.

HEATER CORE REPLACEMENT


If its clogged it can be cleared with the use of Garden hose p[ump.The water has to be turn into the heater hose line and then water has to be removed out via the pump.

==========

For complete step by step procedure,refer heater core flushing and other help links mentioned below.


======

Click the link below:-----

------------

How to Flush Heater Core?

http://schematicsdiagram.blogspot.com/2011/12/how-to-flush-heater-core.html

------------

How to replace heater core on Chevy Astro?

http://schematicsdiagram.blogspot.in/2012/03/how-to-replace-heater-core-on-chevy.html

-----------

Replacing heater core for grand marque?

http://schematicsdiagram.blogspot.in/2012/03/replacing-heater-core-for-grand-marque.html

------------

How to replace heater core for All car models?

Click the link below:---

http://technoanswers.blogspot.com/2011/11/how-to-replace-heater-core-for-all-car.html

-------------

How to replace heater core on Buick Regal?

http://howtobyme.blogspot.in/2012/02/how-to-replace-heater-core-on-buick.html

-------------

How to Remove Heater Core on 2008 Honda Odyssey?

http://howtobyme.blogspot.com/2011/12/how-to-remove-heater-core-on-2008-honda.html

------------

Honda Heater Core Replacement?

http://howtobyme.blogspot.com/2011/12/honda-heater-core-replacement.html

------------

How to replace heater core on Mitsubishi magna?

http://technoanswers.blogspot.in/2012/02/how-to-replace-heater-core-on.html

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How to replace heater core on Mitsubishi eclipse?

http://technoanswers.blogspot.in/2012/02/how-to-replace-heater-core-on_10.html

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These will help.

Thanks.

Nov 28, 2012 | 2000 GMC Jimmy

1 Answer

Can you bypass the heater core


For heater core replacing procedure. I suggest you to go through this related help links.Its all complete step by step procedure: ----How to replace heater core for All car models?

Click the link below: ---

http://technoanswers.blogspot.com/2011/11/how-to-replace-heater-core-for-all-car.html

--------------
How to Flush Heater Core?

http://schematicsdiagram.blogspot.com/2011/12/how-to-flush-heater-core.html

---------------
How to Remove Heater Core ?

http://howtobyme.blogspot.com/2011/12/how-to-remove-heater-core-on-2008-honda.html
Heater Core Replacement?

http://howtobyme.blogspot.com/2011/12/honda-heater-core-replacement.html

------------
To replace heater core?http://technoanswers.blogspot.in/2012/02/how-to-replace-heater-core-on.html------

How to replace heater core?http://technoanswers.blogspot.in/2012/02/how-to-replace-heater-core-on_10.html
How to replace heater core on Buick Regal?

http://howtobyme.blogspot.in/2012/02/how-to-replace-heater-core-on-buick.html
----------This will help.Thanks.

Feb 04, 2012 | 2000 Lincoln Town Car

4 Answers

Heater core leaking through floor vents.


Bad heater core you will need to replace it. About a 2 hour job, very easy to do:


Remove the HVAC module assembly. Refer to HVAC Module Assembly Replacement.
Remove the HVAC filter cover.
Remove the heater core/evaporator tube seals from the module.
Remove the heater core cover screws (1).
Remove the heater core retaining screws (1).
Remove the heater core retaining straps.
Remove the heater core.
Remove the rubber seals from the inlet/outlet pipes of the heater core.

Installation Procedure

Install rubber seals to the outlet/inlet pipes of the heater core.
Install the heater core to the module.
Install the heater core retaining straps.



Install the heater core retaining screws (1).
Install the heater core cover.



Install the heater core cover screws (1).



Install the heater core/evaporator tube seal from the module.
Install the HVAC filter cover.
Install the HVAC module assembly. Refer to HVAC Module Assembly Replacement.

May 19, 2011 | Cadillac DeVille Cars & Trucks

2 Answers

How to replace 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.
  • 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.

Dec 11, 2010 | 1997 Chevrolet Lumina

2 Answers

Replace rear 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.
  • 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.

Dec 07, 2010 | 2003 Chevrolet TrailBlazer

2 Answers

Replace 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.
  • 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.

Dec 04, 2010 | 1995 Oldsmobile Cutlass Ciera

2 Answers

Heater core replacement


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.
  • 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

How 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.
  • 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.

Nov 28, 2010 | 1984 Ford F 250

2 Answers

Heater core replacement


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.
  • 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.

Nov 27, 2010 | 1994 GMC Sierra

2 Answers

How do i replace 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.
  • 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.

Nov 26, 2010 | 1985 Cadillac DeVille

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