How JustAnswer Works:

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

Ask lazydog76 Your Own Question

lazydog76
lazydog76, Chevy Technician
Category: Chevy
Satisfied Customers: 203
Experience:  10 years exp professional, ase master, gm tech
15905188
Type Your Chevy Question Here...
lazydog76 is online now
A new question is answered every 9 seconds

How to replace a heater core in a 2001 Blazer S10 4WD 4door

Customer Question

How to replace a heater core in a 2001 Blazer S10 4WD 4door LT? I just replaced the thermostat…still have cool air blowing through the vent.
Submitted: 5 years ago.
Category: Chevy
Expert:  lazydog76 replied 5 years ago.

Hi, i will assist you in your problem

what is the temp running on the temp gauge. is the top radiator hose and heater hoses getting hot.

Customer: replied 5 years ago.
Temp stays at just shy of 210. I had it in the shop which the guy said if it isn't the thermostat it is the heater core...So the cheaper 1st fix was the thermostat...just got it back and I still have cool air blowing.
Expert:  lazydog76 replied 5 years ago.
ok, first lets check to make sure that the heater hoses that attatch to the engine and to the heater core are hot or very warm to touch, there are 2 hoses lets make sure that you check them both.
Customer: replied 5 years ago.
You will have to give me a moment to start the truck and get it warm...it is 10 degrees here in WI...and I have been researching online for a bit and the truck has been off. I take it that the two hoses at the top of the engine that go into the firewall of the truck cabin are the hoses to check? Sorry...am pretty good with a wrench but no expert when it comes to this part of the truck. Smile thanks for the help thus far.
Expert:  lazydog76 replied 5 years ago.
wow 10 deg, its 60 here in alabama, but yes the hoses are 2 black hoses that are attached on the passenger side of the engine and run to the firewall.
Customer: replied 5 years ago.
Ya...wow...think I need heat...you bet!!! OK the hose close to the passanger door is hot and the the hose toward the driver side is cool...not cold...but very cool.
Expert:  lazydog76 replied 5 years ago.

ok , if one is hot and the other is cold, this is a stopped up heater core, this is a very common thing. flushing out would give you heat probly for the remainder of the season but it will stop up again.

let the engine cool down and take the lines off of the engine and place a garden hose in the hose closest to the drivers side and turn on the water, this will back flush the heater core. reassemble and make sure to top off the antifreeze.

 

or remove the dash assy to gain access to the hvac box and remove and replace the heater core.

 

also i recommend to flush the cooling system and refill with 50/50 antifreeze and water mix.

Customer: replied 5 years ago.

 

Wow...that is it!!! Thanks!!! I am a bit pissed at the shop I go to then. I asked them to take the first step in fixing this...which we agreed the thermostat was step 1 $100.

 

If that did not take care of it then step 2 heater core at $1,000. There was no mention of step 1.5...flush the system. This just saved me big bucks...next step was to dump this POS and buy a new truck $30,000...was not looking forward to that!!!

 

I was looking online at Auto Zone...I see part number 394195 new heater core for $47.99...is that the part I need?

 

Other problems I have with this truck which I have received help is the Wheel Bearings in the front, the dumb oil lines that are seeping, and a low voltage on the alternator.

Expert:  lazydog76 replied 5 years ago.
im not sure on the autozone part number but they should have it in stock. WOW 1000 dollars is a lot of money for heater core replacement, i would find another shop to do my work.
lazydog76, Chevy Technician
Category: Chevy
Satisfied Customers: 203
Experience: 10 years exp professional, ase master, gm tech
lazydog76 and 12 other Chevy Specialists are ready to help you
Customer: replied 5 years ago.
OK...one last question...I never flushed my coolant before...I am sure it is easy but could you walk me through it?
Expert:  lazydog76 replied 5 years ago.

sure, purchase coolant flush at a local parts store, and 2 gallons of antifreeze. drain the radiator fluid into a container, the drain is located at the bottom of the rad. on the drivers side.

refill the system with the cleaner and water, run the engine till hot and make sure the rad is full of water, follow directions on the flush container as to how long to run engine.

then after this process drain again.

refill with water only and repeat the same process as above except don't add any more cleaner, do this until the system is clear.

then drain once more and then refill with 1 gallon of antifreeze and then top off with 50/50 antifreeze.

 

 

most flush cleaners will have a step by step directions on the container.

Customer: replied 5 years ago.
Do I add anything to the reservoir? or will the 50/50 mix fill as needed from the overrun? I know...sounds dumb...
Expert:  lazydog76 replied 5 years ago.

yes add the 50/50 mix to the res. and also be careful because the engine will be hot after running, be sure to let cool to a safe working temp. before opening the cap or drain plug.

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 L Rochester NY
< Last | Next >
  • 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 L Rochester 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!!!! Alex Los 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. GP Hesperia, CA
  • I couldn't be more satisfied! This is the site I will always come to when I need a second opinion. Justin Kernersville, 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. Esther Woodstock, 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. Robin Elkton, Maryland
 
 
 

Meet The Experts:

 
 
 
  • Tim's Auto Repair

    mechanic

    Satisfied Customers:

    7641
    Have owned a repair shop for 25 yrs.
< Last | Next >
  • http://ww2.justanswer.com/uploads/TI/tim37857/2011-10-28_23053_S6301814.64x64.JPG Tim's Auto Repair's Avatar

    Tim's Auto Repair

    mechanic

    Satisfied Customers:

    7641
    Have owned a repair shop for 25 yrs.
  • http://ww2.justanswer.com/uploads/DT/dt69nova/2012-6-15_234154_pic1.64x64.jpg Dave Nova's Avatar

    Dave Nova

    Chevrolet Technician

    Satisfied Customers:

    6870
    ASE Master Certification. GM World Class Certification
  • http://ww2.justanswer.com/uploads/ggrote1/2009-06-27_031011_me.jpg Gary's Avatar

    Gary

    Chevy Technician

    Satisfied Customers:

    5404
    15 years GM master tech
  • http://ww2.justanswer.com/uploads/testedtuff/2009-09-26_170108_pictures.jpg John's Avatar

    John

    Master A.S.E Automotive technician

    Satisfied Customers:

    4071
    A.S.E MasterTechnician A1-A8 w/L1,38 years experience General Motors Master Technician
  • http://ww2.justanswer.com/uploads/RO/rodcuda/2011-7-25_224114_Donhoff1.64x64.JPG Neal's Avatar

    Neal

    Chevy Mechanic

    Satisfied Customers:

    2306
    Shop Owner and Mechanic on multiple makes.
  • http://ww2.justanswer.com/uploads/goodwrench9124/2008-11-09_220838_dscf0007.jpg goodwrench9124's Avatar

    goodwrench9124

    ASE Certified Technician

    Satisfied Customers:

    2041
    Ase Master Certified, GM Master Certified Tech. Awarded GM Top performer, Hybrid certified
  • http://ww2.justanswer.com/uploads/DR/drivefast1971/2012-1-12_172422_0009051tQKh.64x64.jpg Ron Z.'s Avatar

    Ron Z.

    - Chevy Tech -

    Satisfied Customers:

    1912
    18+yrs experience. State Inspector and Chevy Diagnostics
 
 
 

Related Chevy Questions