Replacing the heater core on an 88-94 OBS Chevy 1500

We replaced the heater core on the 1990 GMC K1500 GMT400.
Heater core: GM Genuine Parts 15-60059 Heater Core www.amazon.com/dp/B000C9DE2A/...
Foam tape: 1" x 3/8" www.amazon.com/dp/B08DDHHWN1/...

[@c50ge]

Through the glove box pull the blower motor and carefully clean the evaporator core. Many of these are filled with debris from leaves and dirty. There are several good videos on KZbin to show you how. Will drastically improve your air flow for heat and ac.

[@irishuwould5185]

I need to do that. I paid 1350 for a whole new ac in my 94 and the air flow isn’t strong at all. I hope that will fix the issue. I’m sure it hasn’t been cleaned, but who knows. I bought it back in February.

[@OBSKEV]

@@irishuwould5185any updates on that? Exact problem I have everything was replaced but the evaporator core.

[@irishuwould5185]

@@OBSKEV mine was filled up with leaves and all kinds of stuff like I figured it would be. I cleaned the evap and rinsed it down good. The air flow is better I will say.

[@OBSKEV]

@@irishuwould5185 Dope. Before cleaning it out would it blow cold or no? Mine isn’t blowing cold. A/C lines get ice cold though.

[@irishuwould5185]

@@OBSKEV yea it was cold but it froze up and I had to turn the ac off and just let the fan blow. The coils would freeze over cuz it was clogged. It still does that but just takes longer now.

[@IamDerick]

Thanks for the walk through, a towel is useful on the Pax side floor in case there is residual coolant in old core. Cheers.

[@laughingCoffin88]

Omg this is so much easier than I anticipated, the last one I did was with my buddy on his Sonoma, 2003 I believe and it's behind the entire dash ugh 😩

[@Deadpool-ODST]

Exactly what I was just thinking. It's getting cold so I need to get too it.

[@m.scottmunger4685]

That was an excellent lesson. Not a whole lot of confusing side bar b.s. explanation. Thanks

[@danialbargas5405]

Man great detail s and the walk through and everything very very good education video

[@cbcarper9681]

What are the best videos and very well done thank you

[@davidblackburn9182]

Thank you for simple straightforward video

[@jennaleigh5379]

Thank you for this comprehensive video!

[@Vcoldduck]

Great video very helpful.

[@paradiseranch2421]

Excellent tutorial, thank you!

[@cjcartello]

Excellent video.

[@xXShadowRejectsXx]

I wish all cars were this easy lol. I daily a 94 and have never replaced mine. Always heard it was easy to swap, now I know haha. I changed the one on my dad's 2nd gen dodge and had to require the help of my buddy to maneuver the dash out of the way, it was not very fun lol

[@lonewulf5150]

Thanks for the video it helped me out. 👍

[@stevenpowell5240]

Thank you so much! That helped!

[@alvarochavez1190]

Good video, 👍

[@claygreen4723]

Love the info on your videos. I'm replacing my interior and you've saved me a LOT of headaches! While the dash is out I'm gonna change my heater core since it's been leaking and has the underside of the carpet wet.

[@aronsaleaf4726]

I was at my woman's the other day, saw a canal flowing from my passenger door, I was so confused then had the disgusting sad realization and I was partially heart broken ngl, if it wasn't the daily id rig it but I'm gonna have to put my nose on the grindstone to fix er up

[@cavalierliberty6838]

This is one of the few jobs that is easier on the vortec trucks. Even still, this is super simple.

[@pamelaveilleux4015]

For the original core versus market core tip, does it applies to to a chevy celebrity? Is it the same type of clip that I'll find underneath?

[@garystoddard4141]

third reason because i just want tooo great video

[@kevinshaw8]

Just to make sure I was buying the right part- Does your truck have A/C? It seemed like there might be two different ones available depending on that

[@SuburbanRanch]

@Kevin Shaw I’m not sure if it is a/c dependent but the truck does have a/c

[@landenwolever1016]

Is this the same as the evaporator? I’ve seen the terms used interchangeably just want some clarification.

[@SuburbanRanch]

@Landen Wolever No, the heater core is different than the evaporator

[@my89scottsdale67]

Evaporator refers to the air conditioning (cold air) system I believe

[@israeldiaz2217]

To remove the evaporator core do we need any extra special tools to get it out I need to replace evaporator core but shops are asking for to much $ I need help , help pls any suggestions thank 😃

[@SuburbanRanch]

@Israel Diaz Sorry, we haven’t done that job before. Hopefully someone else can help!

[@irishuwould5185]

I think you have to remove the dash, I’m not sure. Maybe that’s why it’s big money.

[@fauxque5057]

If you are handy there is a way to replace the evaporator from the engine compartment. No dash removal necessary. Unlearned how by watching a few YT videos. I know this is a 2 year old comment but other people will see this comment in the future.

[@Surfmagic13]

That screw on the back bend was a SOB!!

[@lukehelpmetakethisdangmaskoff]

I have the 96 POS Chevy.

[@lhirsch1]

Did you flush the lines to prevent (or minimize) gunk from getting into the new core?

[@SuburbanRanch]

We drained the antifreeze and replaced with fresh antifreeze, but no flush.

[@matthewlara8746]

I have 95 Chevy suburban K1500 I’ve done new AC compressor, relay, resistor, blower motor and etc. ALL OEM PARTS I just did my heater core and now my climate control panel lights turn off when I turn the headlights on and it’s blowing straight heat even when set on HIGH AC. PLEASE HELP!!

[@SuburbanRanch]

@Matthew Lara Kind of sounds like something isn’t wired correctly, but not really sure on this.

[@niklasacuna4193]

Do you have to recharge AC after replacing?

[@SuburbanRanch]

@Niklas Acuña the AC is not connected to the heater core so the answer is no.

[@my89scottsdale67]

Might want to top off your coolant though

[@kr1ck3t81g]

Hello Suburban Ranch..will this heater core fit a 94 gmt-400 c/k 1500 ,5.0, v8 chevy pickup ..just wondering, indeed to replace mines 👍

[@SuburbanRanch]

@L Gonzalez Should be the same part, but check the parts catalog or RockAuto before ordering!

[@kr1ck3t81g]

Ok thanks brother

[@snoopy95520]

My heater core hoses were connected the opposite way from the way of the video so which is the correct way?

[@SuburbanRanch]

@Adrian Contreras The hoses in the video are connected correctly.

[@extraordinaryincome3142]

Would anyone be able to tell my why my truck has no hoses running to the heater core at all?also no belt on my ac compressor

[@SuburbanRanch]

@ExtraOrdinaryIncome My guess is it broke and they did a manual delete. I would guess the heater core leaks as well.

[@Vonjey19]

Wait when did u unhook the hoses im done

[@SuburbanRanch]

@von jey We had one off already because we were doing the valve seals at the same time. It’s the same process as the one we showed though

[@lamarmunson5922]

Is it the same with a 89 2500 350 tbi??

[@SuburbanRanch]

Yes, same heater core on a 1989

[@my89scottsdale67]

Hey I have the same truck

[@paulpasternak2026]

Nice work The gm core fitting and after market not saves me time

[@paulpasternak2026]

Lol except the advance auto here in New Orleans got me a non gm one with an extended clip included in the box for 50$ Took under an hour to change. Thanks for the vid, I'd have never found all the screws not in a million years

[@brucecoulda1596]

Will it make a mess when i pull the hose? I'm going to be using my old bosses shop so I'd be nice to know lol

[@SuburbanRanch]

We drained the radiator first, but yes, there will be some additional antifreeze in the core

[@dennisweber7803]

I have a 94 Silverado that act like the heater control isn’t working have you ever changed one

[@SuburbanRanch]

@Dennis Weber Sorry no, never changed a heater control

[@dennisweber7803]

@@SuburbanRanch Thanks

[@TheMexcutioner]

@@dennisweber7803 Check if the vent actuator is operating correctly, its behind the center of the dash, slightly towards the passenger side. I replaced damn near everything until i found out it was that haha

[@kennethkehoe677]

Do you have to have the foam?

[@SuburbanRanch]

@Kenneth Kehoe I think the foam is a good idea

[@GMCGLORYGARAGE]

Do these heater cores tend to leak antifreeze? I have a leak and though it was the hose but I checked and no holes and even bought a new clamp same issue maybe this is my issue?

[@SuburbanRanch]

Is the leak inside the cab?

[@GMCGLORYGARAGE]

Its under the hood on the firewall side not in the cab where the heater core hoses connect

[@GMCGLORYGARAGE]

I keep leaking where the hoses are supposed to connect to the heater core tubes

[@SuburbanRanch]

It’s either the hose or the core! The hose is much easier to replace, I’d start with that.

[@GMCGLORYGARAGE]

Okay thank you so much I’ll try that

[@custercole5]

Lol it’s cold in here

[@chomper4x4]

Where is the heater bypass control valve?

[@SuburbanRanch]

@bob oh stephens I’m not sure we didn’t mess with it. Maybe someone else can help with the location.

[@fauxque5057]

I believe that it's controlled with a blend door. You are just redirecting air flow and not bypassing the flow of anything other than the air. And wait till you get the pleasure of replacing the blend door actuator for the heater core. The truck has 3 actuators but that heater core door is the worst. It only has 2 screws. One isn't all that bad, the other is that bad

[@greyghost293]

I hate working on cars. Not sure why I keep doing it.

[@SuburbanRanch]

lol we have all been there before!

[@yourboidavis921]

Great video but them Amazon parts won’t last u long, autozone or orileys has original oem parts u can buy that will last longer

[@SuburbanRanch]

@Yourboidavis The part linked is a GM Genuine part we confirmed that.

[@jaxjax5322]

I buy parts in lmc truck and classic industries and not all the parts they send are GM 😏

[@Vonjey19]

Fhkk ya intro lol