Chevy

Chevrolet Repair Questions? Ask a Chevy Mechanic for Answers ASAP

Ask an Expert,
Get an Answer ASAP!

Chevy

No Comment Added

Customer Question
No Comment Added
Submitted: 10 years ago.Category: Chevy
Ask Your Own Chevy Question
Answered in 6 minutes by:
11/3/2007
Chevy Mechanic: Bob, Auto Tech replied 10 years ago
Bob
Bob, Auto Tech
Category: Chevy
Satisfied Customers: 4,087
Experience: Plus 40 years GM, over 30 certified with Chevrolet, ASE certified Master Tech. (Expired, Retired)
Verified

REMOVAL & INSTALLATION

See Figures 1, 2, 3, 4, 5, 6, 7, 8 and 9

  1. Disconnect the negative battery cable.

  2. Position a drain pan under the radiator, open the drain cock and drain the cooling system to a level below the heater core.

Plug the heater core tubes to avoid spilling coolant in the passenger compartment during removal.

  1. Disconnect the heater-to-engine coolant hoses from the core tubes on the firewall, in the engine compartment.

Click image to see an enlarged view
Fig. 1: Exploded view of a common heater core and case assembly


Click image to see an enlarged view
Fig. 2: If necessary, loosen and remove the under dash cabin light retaining bolt


Click image to see an enlarged view
Fig. 3: With the bolt removed, the light and housing may be repositioned out of the way


On some early model vehicles, the cabin light mounted under the dash may interfere with cover removal. If necessary, loosen the retaining bolt and reposition the light housing with the wiring attached.

  1. From the passenger compartment (under the dash) remove the heater core rear case cover-to-cowl screws, then remove the cover from the vehicle.

On a few of the early model vehicles covered by this guide, some of the heater core cover screws may be partially/fully covered by the dashboard. Be sure that all are removed before attempting to remove the cover. If necessary, unbolt and reposition all/part of the dashboard for better access.

  1. Remove the straps or brackets from each end of the heater core.

  2. Carefully remove the heater core from the cowl and case.

To install:

  1. Insert the heater core into the case, taking care not to damage the tubes as they are inserted through the cowl.

  2. Install the straps or brackets to the ends of the heater core and secure using the retaining screws.

  3. Install the heater core rear case cover and secure using the retaining screws.

  4. If moved for access, reposition and secure the dash mounted cabin light and housing.

  5. Connect the heater-to-engine coolant 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 temperatures and check for leaks.

Click image to see an enlarged view
Fig. 4: Loosen and remove the rear case cover screws


Click image to see an enlarged view
Fig. 5: Remove the rear case cover for access to the heater core


Click image to see an enlarged view
Fig. 6: Loosen and remove the core strap/bracket retainers


Click image to see an enlarged view
Fig. 7: Remove or reposition the straps/brackets so the core can be removed


Click image to see an enlarged view
Fig. 8: Most cores are retained by straps/brackets on both ends; don't forget to loosen all retainers


Click image to see an enlarged view
Fig. 9: Carefully withdraw the heater core from the case

Ask Your Own Chevy Question
Ask Bob Your Own Question
Bob
Bob
Bob, Auto Tech
Category: Chevy
Satisfied Customers: 4,087
4,087 Satisfied Customers
Experience: Plus 40 years GM, over 30 certified with Chevrolet, ASE certified Master Tech. (Expired, Retired)

Bob is online now

A new question is answered every 9 seconds

How JustAnswer works:

  • Ask an ExpertExperts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional AnswerVia email, text message, or notification as you wait on our site. Ask follow up questions if you need to.
  • 100% Satisfaction GuaranteeRate the answer you receive.

JustAnswer in the News:

Ask-a-doc Web sites: If you've got a quick question, you can try to get an answer from sites that say they have various specialists on hand to give quick answers... Justanswer.com.
JustAnswer.com...has seen a spike since October in legal questions from readers about layoffs, unemployment and severance.
Web sites like justanswer.com/legal
...leave nothing to chance.
Traffic on JustAnswer rose 14 percent...and had nearly 400,000 page views in 30 days...inquiries related to stress, high blood pressure, drinking and heart pain jumped 33 percent.
Tory Johnson, GMA Workplace Contributor, discusses work-from-home jobs, such as JustAnswer in which verified Experts answer people’s questions.
I will tell you that...the things you have to go through to be an Expert are quite rigorous.

What Customers are Saying:

I was having a terrible problem with the wheel bearings on my 98 Chevy Cavalier and I suspect that using this website saved me plenty of time and money.

Todd LRochester NY

Wonderful service, prompt, efficient, and accurate. Couldn't have asked for more. I cannot thank you enough for your help.

Mary C.Freshfield, Liverpool, UK

This expert is wonderful. They truly know what they are talking about, and they actually care about you. They really helped put my nerves at ease. Thank you so much!!!!

AlexLos Angeles, CA

Thank you for all your help. It is nice to know that this service is here for people like myself, who need answers fast and are not sure who to consult.

GPHesperia, CA

I couldn't be more satisfied! This is the site I will always come to when I need a second opinion.

JustinKernersville, NC

Just let me say that this encounter has been entirely professional and most helpful. I liked that I could ask additional questions and get answered in a very short turn around.

EstherWoodstock, NY

Thank you so much for taking your time and knowledge to support my concerns. Not only did you answer my questions, you even took it a step further with replying with more pertinent information I needed to know.

RobinElkton, Maryland

< Previous | Next >

Meet the Experts:

GM Tech (Cam)

GM Tech (Cam)

Chevy Technician

15,289 satisfied customers

GM Grand Master Technician 2007. 14 years experience.

Gary

Gary

Chevy Technician

9,357 satisfied customers

15 years GM master tech

Tim&#039;s Auto Repair

Tim's Auto Repair

mechanic

8,866 satisfied customers

Have owned a repair shop for 25 yrs.

Dave Nova

Dave Nova

Chevrolet Technician

7,092 satisfied customers

ASE Master Certification. GM World Class Certification

John

John

Master A.S.E Automotive technician

4,071 satisfied customers

A.S.E MasterTechnician A1-A8 w/L1,38 years experience General Motors Master Technician

Don - Mo Lurch

Don - Mo Lurch

Auto Mech / Electronics

2,918 satisfied customers

Chevrolet Cert., Heavy Line Mech, Race Shop Owner, Mobile Electronics.

Ron Z.

Ron Z.

- Chevy Tech -

2,734 satisfied customers

18+yrs experience. State Inspector and Chevy Diagnostics

< Previous | Next >

Related Chevy Questions
My water from the radiator is mixing in with my engine oil.
My water from the radiator is mixing in with my engine oil … read more
kwiggins29059
kwiggins29059
Associate Degree
219 satisfied customers
I'm getting ready to deal with a clogged heater core on an
Hi, I'm getting ready to deal with a clogged heater core on an 08 Chevy Uplander. Takes very long time of driving for any warm air to come out, and even then barely warm. Two shops said its the heater… read more
Mechanic01
Mechanic01
1,659 satisfied customers
Have a 2000 chevy suburban. changing the heater core. do you
have a 2000 chevy suburban. changing the heater core. do you have a diagram showing all the attachment bolts for the HVAC unit to the firewall so I can undo them and pull it away from the firewall? Ri… read more
Lou P. master tech
Lou P. master tech
Mercedes Benz master tech
Bachelor's Degree
649 satisfied customers
No heat in my 90 1500 Chevy Silverado. flushed radiator, new
no heat in my 90 1500 Chevy Silverado. flushed radiator, new hoses, new thermostat. … read more
Gary
Gary
Chevy Technician
Vocational, Technical or Trade Scho
9,357 satisfied customers
I need to replace the heater core on my 2004 chevy caviler
I need to replace the heater core on my 2004 chevy caviler … read more
roy
roy
Associate Degree
3 satisfied customers
Need to replace heater core. Whats the easiest way to get to
need to replace heater core JA: Okay, I'll connect you to the mechanic to go over that information regarding your Chevy. Before I do, is there anything else you want him to know? Customer: whats the e… read more
Edward Clayton
Edward Clayton
Associate Degree
1,033 satisfied customers
Radiator fan motor does not run when engine gets hot. I
radiator fan motor does not run when engine gets hot. I checked voltage on the connector and there was no voltage being supplied to the fan motor … read more
baddad1
baddad1
technician
High School or GED
5 satisfied customers
I need my engine rebuilt. Cracked the radiator and
I need my engine rebuilt. Cracked the radiator and overheated the engine. Lost power and won't run now. … read more
rpmdiag
rpmdiag
High school
7,267 satisfied customers
New engine, new starter, radiator, distributer ,coil, map
new engine, new starter, radiator, distributer ,coil, map sensor in '1993 Chevy Silverado K2500 7.4L 4L80E trans, setting code 42.. Also new ignition module … read more
Cesar Jimenez
Cesar Jimenez
Owner/CEO
Vocational, Technical or Trade School
84 satisfied customers
At the bottom of the radiator there is a pump or something
at the bottom of the radiator there is a pump or something that has coolant lines that lead up to the end of the exhaust manifolds. the lines are leaking coolant. just need to know what the thing is s… read more
Cesar Jimenez
Cesar Jimenez
Owner/CEO
Vocational, Technical or Trade School
84 satisfied customers
My son needs to replace his heater core but I have a
My son needs to replace his heater core but I have a question normally when your heater core leaks or goes out it leaks on the inside of the car well the leak is on the outside of the engine is that n… read more
GM Bob
GM Bob
Automobile Technician
High School or GED
1,002 satisfied customers
My heater core has been disconnected and I would like to
Hi my heater core has been disconnected and I would like to reattach the hoses … read more
Gary
Gary
Chevy Technician
Vocational, Technical or Trade Scho
9,357 satisfied customers
I had a new heater core installed in my 99 Blazer - i only
I had a new heater core installed in my 99 Blazer - i only get hot air when it set to 82 degrees other wise i only get cold air … read more
Chad Farhat
Chad Farhat
Owner
Associate Degree
4,393 satisfied customers
Coolant leak passenger side heater core box. Not sure how
and the guy didn't tell me when I should top up and gas jockey put concentrate instead of dexcool … read more
heavy_chevy_396
heavy_chevy_396
Vocational, Technical or Trade Scho
2,518 satisfied customers
The engine overheats. And have replaced radiator cap. 2005
The engine overheats JA: Have you checked the coolant? Have you checked for a leak in the cooling system? Customer: Yes, and have replaced radiator cap JA: What is the make/model/year of your car? Cus… read more
TIM MOHR
TIM MOHR
SHOP OWNER
Master's Degree
8,037 satisfied customers
Oily fluid right side cab behind heater core 1984 chevy. All
oily fluid right side cab behind heater core 1984 chevy … read more
roy
roy
Associate Degree
3 satisfied customers
Heater core failed, it's leaking into the passenger side
I haven't fixed it yet. It happened yesterday after my AC quit. I live in Louisiana so not having AC is tough … read more
David Craig
David Craig
OWNER/MECHANIC
Associates
4,388 satisfied customers
Engine overheated and blew radiator. Replaced radiator and
engine overheated and blew radiator. Replaced radiator and put in new thermostat. engine will idle 20 min or so to get up to temp, Starts to overheat (boiling water in upper rad hose while lower hose … read more
Gunvir Singh
Gunvir Singh
1,817 satisfied customers
Disclaimer: Information in questions, answers, and other posts on this site ("Posts") comes from individual users, not JustAnswer; JustAnswer is not responsible for Posts. Posts are for general information, are not intended to substitute for informed professional advice (medical, legal, veterinary, financial, etc.), or to establish a professional-client relationship. The site and services are provided "as is" with no warranty or representations by JustAnswer regarding the qualifications of Experts. To see what credentials have been verified by a third-party service, please click on the "Verified" symbol in some Experts' profiles. JustAnswer is not intended or designed for EMERGENCY questions which should be directed immediately by telephone or in-person to qualified professionals.

Disclaimer: Information in questions, answers, and other posts on this site ("Posts") comes from individual users, not JustAnswer; JustAnswer is not responsible for Posts. Posts are for general information, are not intended to substitute for informed professional advice (medical, legal, veterinary, financial, etc.), or to establish a professional-client relationship. The site and services are provided "as is" with no warranty or representations by JustAnswer regarding the qualifications of Experts. To see what credentials have been verified by a third-party service, please click on the "Verified" symbol in some Experts' profiles. JustAnswer is not intended or designed for EMERGENCY questions which should be directed immediately by telephone or in-person to qualified professionals.

Show MoreShow Less

Ask Your Question

x