heater core replacement?

no way to repair it, you can bypass it but this will leave your heater system inoperative.. to bypass heater core just disconnect both heater hoses at firewall and then add a third piece of heater hosing between the two disconnected from firewall. Here are the instructions on how to get the core out in the diagrams below. This guide can help as well

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


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

step by step how to change heater core some say yoy have to remove dash if so doyou have to take it all the way out what about air bag do you have to disarmed it or just unhook battery or ok just to go ahead with repair pretty knowledgeable just unsure about dash and air bag

anytime there is an airbag involved it's best to disconnect the battery. You'll have to see about puling the dash, i think you do but most of the time if you loosen it an dpull it back a little way you may have engouh room for the heater core. You can go on the site here and buy a 3 day manual for $10 and look it up and print it soyou would have it step by step availability......

When I turn on the A/C or heat I smell that sweet antifreeze smell that I hate to smell "means a lot of work"

Well I smell it every day I drive and I wonder if I'm 100%sure it's bad before I tare it apart.

I don't get a foggy windshield when I turn on the defrosters. I can't find any leaks on the floor.

It looks to me they have the core sealed so it would hold a lot of liquid before it leaks.

What should I do?

How long of a job is it?

Do I have to take the whole dash out with the steering colum?

Thanks

The first thing I would do is top off the anti-freeze and pressure test the cooling system.

I am having the same Issue so far was quoted $600.00 it takes 8 hrs to change FYI good luck with your problem and let me know how it goes I will do the same!

WOW what a job! entire dash an heat/ac duct assy. has to come out Get a manual if attempting on your own! In hind sight would have paid someone rather than diy!

Heater problem
2002 Chevy S-10 V6 Four Wheel Drive Automatic 62500 miles
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how do I get the heater core out

My labor guide calls for 8 hrs with a/c. That means the entire dash has to come out of the truck far enough to get the entire HVAC plenum out from under the dsh. Not a DIY project fo the weak of heart. Need to have the a/c evacuated and then vacuumed down and recharged when done

I need detailed step-by-step instructions on how to replace the heater core.

Remove the HVAC module. See: Heating and Air Conditioning\Housing Assembly HVAC\Service and Repair
Remove the heater core access cover screws.
Remove the heater core access cover.







Remove the heater core from the HVAC module.
INSTALLATION PROCEDURE








Install the heater core to the HVAC module. NOTE: Refer to Fastener Notice in Service Precautions.







Install the heater core access cover. Tighten Tighten the heater core access cover screws to 1.9 N.m (17 lb in) .
Install the HVAC module. Refer to Heater/Vent Module Replacement.

What size bolt that goes in the heater box outside under the hood and where when you replace the heater?

Unfortunately, we don't have that level of detail on any of the procedures or guides. However, from memory they are normally 5/16 socket.

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

If you can, get a picture of what you are dealing with and we may be able to identify the size just by looking at it. However, if the ones you are talking about are those "hidden" bolts, unfortunately you may have to do it by feel because hopefully if this was ever done before the correct size bolts were put back in. Thanks

Just following up on this. Is this the bolt that you are talking about? See the attached.

If it is, then I believe these are 8 or 10mm. However, most people drill a hole in the plastic housing in front of the bolt and then they can get an extension in a more direct line. I circled the location people do this and then they will need to use a sealant of some sort to seal the hole.

Adding to what Kenny said about that particular bolt, ice done that job a couple of times. It's a 10mm bolt. I never bothered putting it back in when reassembling because there are plenty of other bolts to hold it all together. But if you really do want to put it back in there, then do as he says with drilling and using a ratchet with a long extension.

I no that it's more bolts holding it, but I have a rattling sound come from the dash now.

Sorry to hear that. That is the worst when you get something like this done and it is rattling. Unfortunately it is hard to recommend what this could be other then how to try to identify it. The best way I have done these is have someone else drive and I would put pressure around the dash to try and narrow the area it is coming from.

Let us know if there is a way you need us to help. Thanks

Could be a piece of the defrost vent went down into the HVAC box. Try running it on high fan speed while switching the modes back and forth. If it stops then you e probably solved the problem and it'll come out of the floor vent when you go around a corner.

It could also be just the nuts on the metal cover that sits below the steering column. I didn't get that completely tightened the first time once and it made quite a racket.

thanks I found it . It was the flap that goes over the header core that has two screws in it. It was rocking back and forward at the bottom of the box. needed to just put the screws in it. Thanks everyone for your help.

You are welcome. Thanks for the info on that. I am sure that will help others. Please come back to 2CarPros in the future if you need help on other issues. Thanks

2001 chevy silverado how do i change heater core ?

Removal Procedure
Remove the heater/vent module. Refer to HEATER/VENT MODULE .
Remove the heater core access cover screws.
Fig. 14: Identifying Heater Core Access Cover & Screws
Courtesy of GENERAL MOTORS CORP.
Remove the heater core access cover.
Remove the heater core from the heater/vent module.
Fig. 15: Identifying Heater Core
Courtesy of GENERAL MOTORS CORP.


Installation Procedure
Install the heater core to the heater/vent module.
Fig. 16: Identifying Heater Core
Courtesy of GENERAL MOTORS CORP.
NOTE:Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.

Install the heater core access cover.
Tighten
Tighten the heater core access cover screws to 1.9 N.m (17 lb in).
Fig. 17: Identifying Heater Core Access Cover & Screws
Courtesy of GENERAL MOTORS CORP.
Install the heater/vent module. Refer to HEATER/VENT MODULE .


these are some tips from Master technicians that have perform the job

Vehicle: 2001 Chevrolet S10 Pickup
Category/Subcategory: HVAC / Manual HVAC System
Title/Heading: MANUAL A/C-HEATER SYSTEMS - BLAZER, JIMMY, SONOMA & S10 PICKUP / HEATER CORE
Tip: R&R HEATER CORE 2000 S-BLAZER
Current rating is 3.5 (rated by 24 shops) Click to rate tip. Showing 1-12 of 12

Posted By: JakeP. Flag Post For Monitor Review
Shop: JAKES AUTOMOTIVE
Date: 1/7/2008 5:22:14 PM

Put in one of these today. Book gives 8.5 took about 3 hrs. The 98 model is harder to do. I started by taking the hoses loose. Then move the blower resister. Look down in there---unscrew a bolt going the firewall into the blower housing. There is a stud coming through the firewall in the middle. Takes 7/16 socket--take care of that one. Now go to the inside and take the whole dash and put it in the backseat. Scews at the top. A 10mm headed bolt on each side. Drop the column down. Need to do some unplugging. Remove glove box and you got a big electrical connector-use 7mm socket. A vac. connector. Get some slack going for the ant. cable. IMPORTANT-- Take aloose one connector at bcm(plastic box in middle). The one at the top going to dash.I almost pulled it by the roots. After pulling the dash back a little you will see a connector on driver's side with big wires---get it. And get the ant. cable out the back of radio. None of this bad to do. The housing has a 10mm headed bolt at bottom and two screws coming in backwards through the firewall. Undo the bolt. I used a hammer and big screw driver on the other two under there. Yank back-do the core. I could do three of these in one day and I'm getting old. Didn't take pictures sorry. Got a late start on it today and to my surprise finished it. If you think this one is hard better run when a jeep comes in.----jake

Posted By: Tim__G Flag Post For Monitor Review
Shop: JAYS CAR REPAIR
Date: 1/7/2008 6:20:28 PM

Jake.

Great tip.

I remember doing this last year especially the nut inside the case.

I was hoping to do another one so I could get some pictures for our friends.

I am surprised you don't have pictures.


Posted By: Tech1 Flag Post For Monitor Review
Shop: BIRNERS AUTO REPAIR
Date: 11/24/2008 1:29:20 PM

This is first one i did took me 5 1/2 hours thanks for the tips

Posted By: Tech1 Flag Post For Monitor Review
Shop: A AND P AUTOMOTIVE
Date: 2/19/2009 1:07:43 PM

great tip 3 hours thanks mike a & p automotive


Posted By: Tech1 Flag Post For Monitor Review
Shop: DECARLOS AUTO REPAIR
Date: 6/29/2009 11:38:53 AM

THANKS FOR THE VERY GOOD TIP!!!!

TERRY D.

Posted By: Tech1 Flag Post For Monitor Review
Shop: MID CITY AUTO INC
Date: 4/12/2010 1:39:24 PM

not a sucsessful repair if it leaves more broken than it comes.[hammer ,screw driver?]

Posted By: Tech1 Flag Post For Monitor Review
Shop: A C AUTOMOTIVE
Date: 8/11/2010 5:52:56 PM

Hey guys! Take the extra time to remove the lower fasteners at the firewall! Dont be a "HACK" This is the difference between and "Tech" and a "Greaseball". Customers pay good money for a repair done right, don't tarnish your reputation buy short cutting! It only takes an additional 20 minutes.

Posted By: Tech1 Flag Post For Monitor Review
Shop: JOES AUTO SERVICE
Date: 8/11/2010 7:53:36 PM

Yeah, yall quit tearing up stuff and do it right. What's wrong wid ya..!!

Posted By: Tech1 Flag Post For Monitor Review
Shop: DIAMOND AUTO REPAIR
Date: 8/12/2010 5:26:49 AM

Hmmm... You must have broken off the stud that goes from the evap case through the fire wall on the far right side. Only way to PROPERLY remove the nut on that stud is to remove the right inner fender and evap case. Hope your customer enjoys their Blazer with the new "rattle trap" dash installed.


Posted By: Tech1 Flag Post For Monitor Review
Shop: JOES AUTO SERVICE
Date: 8/12/2010 5:37:33 AM

Yep, he should have tore off the whole right side of truck ta get to that one stud.

loss of heat wont get hott. but does get luke warm..i changed thermostat...truck has gage and motor is warming up correctly the line in to heater core is slightly warmer then other line should i flush heater core or replace,,,, also it has red anifreeze i think i put green in it to fill it at previous checking of fluids so i believe it is mixed...

If the car had the factory Dex Cool coolant, you can not mix the green with it. If you did, that is the problem. Have it fulshed immediately and replace it with GO 5 universal coolant. You must flush or it will corrode and clog the engine system.

Let me know what you find.

Gosh ,now it want go through because I don,t have enough characters.I,m just typeing this to get enough characters.my Qustion is gonna be at the end of this .Its just a simple question.I need to replace the heater core in my s10.Can I cut a door in the firewall,instead of removeing the WHOLE DASH! Or am I gonna run into unforseen problems?

No professional would consider that for good reason. You still have to separate the heater box halves, discharge the air conditioning if you have it, and remove the AC evaporator. Do it the right way and don't chop up the truck.

that answers my ?.-------Thanks for your time

Hello. I've read on several forums and gotten good tips to replace the heater core on our S10. My question: Is it necessary to discharge the A/C before taking on this project? Thanks much!!

Hi
No need to discharge AC. Remove acess cove unbolt core and out she comes.
Good Luck
Thanks for donate

Thanks for the quick response!! ;O)