Heater core today!! - The 1947 - Present Chevrolet & GMC Truck Message Board Network

dwaite72lnghrn · 11-07-2004, 08:50 PM

I changed the heater core today. A few pictures of the change out. New heat core from GMC Paul next to the old unit and the empty spot. It took me about 2 hours, I also had to epoxy one of the mount screws back on that I b roke about 14 years ago.

gr8scott51 · 11-07-2004, 08:55 PM

So that's the a/c type. I didn't realize you had to drop the inner fender for that one, too. Jewels took some nice pics of the non-a/c unit about the same time I changed mine. They should both be in the FAQs.

**Stocker** · 11-07-2004, 09:41 PM

I replaced my A/C type heater core several years ago. Luckily for me (?!?) I can't recall much about the procedure except that it seemed like a big PITA. Then again, I know for sure I didn't drop the inner fender. Might have made the job a bit easier!

skokie · 11-07-2004, 11:31 PM

I was doing that this sat and had to stop in my tracks cause my blower moter gasket is shredded. One I get the new one I can put it all back together.

dwaite72lnghrn · 11-07-2004, 11:33 PM

I changed the blower relay on the box today also. It's nice to have a high setting again.

Swbman · 11-07-2004, 11:33 PM

I just changed the one in my 71 suburban about a week ago,since it has ac all I had to do was pull the inner heater core box located under glove box,about five barrel screws have to be removed under the hood around the ac dog house, the only time you have to remove the right fender is when its a non ac truck,theres I believe one or two bolts that can only be removed with the fender lowered or removed.

meathead95 · 11-08-2004, 02:22 PM

got a pic of the blower relay switch? i dont have high on my blazer and maybe thats why.

dwaite72lnghrn · 11-08-2004, 09:55 PM

This is an airconditioner blower relay. top and side. It mounts to the right side of the inside heater box.

meathead95 · 11-09-2004, 04:02 PM

cool it will make a difference in how hard the air blows correct? can i get it at autozone or where?
thanks
keith

dwaite72lnghrn · 11-09-2004, 07:48 PM

My relay would make a sound like a spring snapping when I put the switch to HIGH. The first and second position worked fine. It really hepls the defrost the windsheild. I got it through GMC Paul when I ordered the heater core. I don't think you should have a problem getting it at AutoZone or NAPA. I didn't try there, had to wait for a core anyway.

bouncytruck · 11-09-2004, 08:10 PM

I'm having the same problem with my heater - only low and mid, no high. I changed the resistor out this weekend but it didn't fix the problem. My next step was going to be the switch, but it sounds like I should change this relay out first. THANKS!

Brainchild · 11-09-2004, 09:08 PM

boy this must have been bad carma or something.I had to do mine today.It blew and fogged the whole inside of the truck,and the taste was terrible

Someone had torched a couple of holes in the fenderwell though so the bottom bolts were a snap.

It's an AC cab,with a non AC heaterbox,go figure

Took me 45 minutes including the trip to autozone

11-07-2004, 08:50 PM	#1
dwaite72lnghrn Registered User Join Date: Jun 2002 Location: central pa Posts: 1,525	Heater core today!! I changed the heater core today. A few pictures of the change out. New heat core from GMC Paul next to the old unit and the empty spot. It took me about 2 hours, I also had to epoxy one of the mount screws back on that I b roke about 14 years ago. __________________ 72 longhorn c30 502BB/th400/fact air/4.11rear/ custom camper 72 bug(the better half's) under reconstruction 2009 HHR aqua blue 71 GMC k20 350/sm465 2009 Chevy hd3500 6.6 Victory Red crew cab dually Dave & Jeanne

11-07-2004, 08:55 PM	#2
gr8scott51 Registered User Join Date: Mar 2003 Location: Bremerton, WA Posts: 1,839	So that's the a/c type. I didn't realize you had to drop the inner fender for that one, too. Jewels took some nice pics of the non-a/c unit about the same time I changed mine. They should both be in the FAQs. __________________ Silence is golden, duct tape is silver. - Scott

11-07-2004, 09:41 PM	#3
Stocker 20' Daredevil (Ret) Join Date: May 2003 Location: Jefferson State Posts: 13,692	I replaced my A/C type heater core several years ago. Luckily for me (?!?) I can't recall much about the procedure except that it seemed like a big PITA. Then again, I know for sure I didn't drop the inner fender. Might have made the job a bit easier! __________________ - Mike - 1972 K20 LWB 350/350/205 RIP El Jay

11-07-2004, 11:31 PM	#4
skokie Registered User Join Date: Oct 2003 Location: San Jose Ca. Posts: 3,339	I was doing that this sat and had to stop in my tracks cause my blower moter gasket is shredded. One I get the new one I can put it all back together. __________________ RIP to my son Dylan. 5/17/2002 - 8/18/2018 If you want to know more about rare forms of pediatric cancer or if you want to help fund pediatric cancer research, please check out the website for the non-profit I started. https://slothforpedcancer.org 68 build thread http://67-72chevytrucks.com/vboard/s...d.php?t=223234

11-07-2004, 11:33 PM	#5
dwaite72lnghrn Registered User Join Date: Jun 2002 Location: central pa Posts: 1,525	I changed the blower relay on the box today also. It's nice to have a high setting again. __________________ 72 longhorn c30 502BB/th400/fact air/4.11rear/ custom camper 72 bug(the better half's) under reconstruction 2009 HHR aqua blue 71 GMC k20 350/sm465 2009 Chevy hd3500 6.6 Victory Red crew cab dually Dave & Jeanne

11-07-2004, 11:33 PM	#6
Swbman Senior Member Join Date: Mar 2004 Location: Tulsa,Oklahoma Posts: 606	I just changed the one in my 71 suburban about a week ago,since it has ac all I had to do was pull the inner heater core box located under glove box,about five barrel screws have to be removed under the hood around the ac dog house, the only time you have to remove the right fender is when its a non ac truck,theres I believe one or two bolts that can only be removed with the fender lowered or removed. __________________ 1961 BUICK LESABRE 1968 CHEVELLE SS 396 1969 BUICK RIVIERA GS 1971 2 WHEEL DRIVE BLAZER 1971 4X4 BLAZER 1971 SHORTBED CHEYENNE FLEETSIDE 1971 SHORTBED 4X4 FLEETSIDE ** ...My Ebay

11-08-2004, 02:22 PM	#7
meathead95 computer illiterate Join Date: Jan 2001 Location: Des Moines, IA Posts: 6,446	got a pic of the blower relay switch? i dont have high on my blazer and maybe thats why. __________________ 72 2wd blazer 72 swb 4x4

11-08-2004, 09:55 PM	#8
dwaite72lnghrn Registered User Join Date: Jun 2002 Location: central pa Posts: 1,525	This is an airconditioner blower relay. top and side. It mounts to the right side of the inside heater box. __________________ 72 longhorn c30 502BB/th400/fact air/4.11rear/ custom camper 72 bug(the better half's) under reconstruction 2009 HHR aqua blue 71 GMC k20 350/sm465 2009 Chevy hd3500 6.6 Victory Red crew cab dually Dave & Jeanne

11-09-2004, 04:02 PM	#9
meathead95 computer illiterate Join Date: Jan 2001 Location: Des Moines, IA Posts: 6,446	cool it will make a difference in how hard the air blows correct? can i get it at autozone or where? thanks keith __________________ 72 2wd blazer 72 swb 4x4

11-09-2004, 07:48 PM	#10
dwaite72lnghrn Registered User Join Date: Jun 2002 Location: central pa Posts: 1,525	My relay would make a sound like a spring snapping when I put the switch to HIGH. The first and second position worked fine. It really hepls the defrost the windsheild. I got it through GMC Paul when I ordered the heater core. I don't think you should have a problem getting it at AutoZone or NAPA. I didn't try there, had to wait for a core anyway. __________________ 72 longhorn c30 502BB/th400/fact air/4.11rear/ custom camper 72 bug(the better half's) under reconstruction 2009 HHR aqua blue 71 GMC k20 350/sm465 2009 Chevy hd3500 6.6 Victory Red crew cab dually Dave & Jeanne

11-09-2004, 08:10 PM	#11
bouncytruck SKINNY TIRES RULE! Join Date: Sep 2001 Location: Bothell, WA Posts: 11,049	I'm having the same problem with my heater - only low and mid, no high. I changed the resistor out this weekend but it didn't fix the problem. My next step was going to be the switch, but it sounds like I should change this relay out first. THANKS! __________________ bouncytruck 1972 K5 The Hauler 1994 K1500 Suburban The Daily2010 Kia Soul Wife's Ride2014 Fiat 500L

11-09-2004, 09:08 PM	#12
Brainchild Still drivin' a Rat Rod Join Date: Sep 2004 Location: Monett Missouri Posts: 4,925	boy this must have been bad carma or something.I had to do mine today.It blew and fogged the whole inside of the truck,and the taste was terrible Someone had torched a couple of holes in the fenderwell though so the bottom bolts were a snap. It's an AC cab,with a non AC heaterbox,go figure Took me 45 minutes including the trip to autozone __________________ Rusty Member #13872 Instead of saying.....you are a discomfort in the back of my front.....one should be able to say...... you are a pain in the a$# 71 GMC LWB 49 Chevy 85 Chevy G20 Check out my website



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