2000 blazer heater core removal
 

hey all.

well i just got my power steering fixed and i do beleive my heater core went out.

symptoms: when heat is on a nasty smell which i do beleive is the dex cool coolants and there's smoke coming out of the vents. but i wanted to know if anyone had any helpful hints on getting the dash out or maybe a online pdf i can print off or really anything. thnks all

Justin.





"2000 blazer. 4.3 vortek v6 2wd, aftermarket ecm tcm. flowmaster dual exhaust no cat. 2 12 inch infinity subwoofers, 1500watt bazooka amp,"

RE: 2000 blazer heater core removal
 

Hi bama, sounds like your right. if yours is similiar to mine it would take about 3 hours taking your time and thinking as you go. i,m not sure if the methods are the same between the different years so maybe someone else can help with procedures good luck

RE: 2000 blazer heater core removal
 

I just did this yesterday so its really fresh in my mind.

remove kickpanels
remove 4 bolts (5/8) on steering wheel. drop it down in the seat.
remove 1 bolt on each end of dash at base (10mm)
unclip underdash harnesses
remove dash speaker grills and dash vent, remove 4 screws in them ( two in center, one in each speaker opening).
dash will swing forward
unclip wire harnesses behind dash.
pull out dash

there are a bunch of 7mm hexheads around the heater core compartment
open it, replace core, reassemple.

re-install is reverse.

its actually really easy, just reall scary the firstime.

RE: 2000 blazer heater core removal
 

In regard to removing the "black box" around the heater core; make sure you remove ALL the screws, there are a couple on the left side that can be hard to find. I suggest using a flashlight to look around the edge and make sure you get them all. Then pull gently in a tugging fassion; pull, let loose, pull, let loose, as the seal can make it kinda not want to come loose, just be delicate with the seal. after you get the box off there are five screws for the core itself, 2 on each bracket and one that holds the bracket that holds the pipes in place. BE SURE you re-install the pipe bracket securely or you may damage the core when you reinstall the hoses.

2000 blazer hearet core removel
 

other sites and videos are showing taking the radio out insterment cluister out etc. is all this required?

almost there!
 

I'm at the removing the black casing part, just taking a smoke break.
So to get this correct, I do NOT need to remove the WHOLE entire core box with the core inside? (Meaning no need to go engine side and remove all the bolts?). So far I think I removed 5 little gold 5.5 mm bolts that hold the top half of the casing on. The far one behind the glove box was a B****...one click on the wrachet...ugh!

PS I have a 2000 blazer ls, with AC (even though it doesn't work).

There are way too many different instructions for different models to do this. It'd be cool if they could be sorted by year/options....holy.

On a good note, my dad is a mechanic and so far I haven't called him for help! I love this forum!

i just got done two days ago. you need to losen the box enough to be able to lean it back to get the old core out. there is one bolt coming from the engine compartment that is behind the air conditioning stuff. It took me for ever to find it. the easiest way to get to it is split the heater coer box by removing enough of the the 5.5 mm bolts that will allow you to reach through . there is a large square hole in the fire wall that gives access. if you do it this way make sure all the damper doors work properly after to put the box back together.

Yea i figured it all out, broke two engine side bolt at bottom of casing, oh well! I didnt realize i was missing so much heat before! It gets HOT now, love it!

Flush out that nasty dex cool too and go with the green stuff. You may be replacing your manifold gasket next.

Dexcool wouldn't be at fault for a LIM gasket failure. Happens just as often on the green juice (which now has more in common with Dexcool than it ever used to). Educate yourself on the subject (read that entire thread).

i would take the evap core out of it and try to clean it out as much as possible, i did it to mine, and theres a bolt down under the blower resistor, pull the resistor and look thru the hole with a light u will see the nut or bolt

Sorry I tend to beleave what many mechs. have told me over the 10 years I've own my blazer. Dexcool has caused my heater core and radiator to clog up and many other peoples cars I know as well. GM coming out with Dexcool was one of the worst mastakes they made besides moving over seas. I hope my Blazer last me forever cause it's the last GM i'll ever own.

Ok, so instead of educating your self on the subject you choose to be a FUD spreading lemming. Good for you! Anyone else that wants to actually be informed on the subject can read the thread I linked to and respond there for further discssion on the subject. I am just stating the facts of the matter here. This thread is a bout a heater core problem.

Oh and before you get more bent out of shape over my post, do yourself a favor and read the post I linkedam to then respond there if you still believe your mechanic. By the way, FUD == fear, uncertainty, & doubt.

So a while later and now with snow I've realized my 4x4 won't kick in now... :(
All the lights work, but it won't engage when I press the button. So, does anyone know exactly where all the connections are for this and where I should look? I really really really, don't want to have to take the whole dash off again, specially now that it's cold out.

PS a reminder: I have a 2000

Dash removal ?
 

So I have most of the dash out but it's hung up on the e-brake cable so I can't get a clean access to the black housing.

pretty old thread, but are you talking about the ebrake release? if so, reach up under the dash, and you can push back, and the cable will come out of there, kinda like how a brake cable is held onto a bike brake lever.

I have a 96 chevy blazer 4.0L and has very little heat. I ran a coolant systen clearer and a flush. Flushed system 3 times, and changed thermostat....I have now NO heat, i repeat "NO" heat at all...any ideas? I plan to try to flush out the heater core out first. Any ideas with out an air compressor?

Did you burp the system by running the vehicle without the radiator cap until there were no air bubbles? You cant get heat if you have air trapped in there. Also be sure you have enough coolant thats a start lol.

old thread good info.
 

two hours in to this project can't get dash out. not sure why. it is a little loose but it is not coming all the way out. not sure if i am missing something, i have looked around with my inspection camera but cannot find anything yet.thankfully I am doing it in a heated garage since its snowing out. this truck has a date with some donuts and I do not intend to miss it.

btw mine is a 98 zr2

I was at a big name mechanic and got a quote for the heater core and they told me it was an 8 hour job, which is 16 hours if I do it. Is this an accurate estimate or are they trying to scare me off of the job. btw its a 01 Jimmy

It is somewhat time consuming, not overly difficult though. Dash needs to come out. Removing the steering column, and center console makes that a lot easier.


I would think anyone that's at least somewhat mechanically inclined could get it done within 8 hours.