The 1947 - Present Chevrolet & GMC Truck Message Board Network







Register or Log In To remove these advertisements.

Go Back   The 1947 - Present Chevrolet & GMC Truck Message Board Network > 47 - Current classic GM Trucks > The 1973 - 1987 Chevrolet & GMC Squarebody Pickups Message Board

Web 67-72chevytrucks.com


Reply
 
Thread Tools Display Modes
Old 07-29-2014, 09:49 PM   #1
jd21476
Registered User
 
jd21476's Avatar
 
Join Date: Aug 2013
Location: San Diego, CA
Posts: 236
Are my heater core lines routed correctly?

The shop that did my tranny swapped my heater core for free when it blew. Now I'm not getting any heat (not that I need it right now) because I think they routed my lines backwards. What do you think?
Attached Images
 
__________________
1973 Chevy K20
jd21476 is offline   Reply With Quote
Old 07-29-2014, 09:53 PM   #2
MountainGoat1966
Registered User
 
Join Date: Jan 2010
Location: northern arizona
Posts: 259
Re: Are my heater core lines routed correctly?

In theory, it should work fine.
The heater core and engine both each have a 5/8" and 3/4" fitting, and the hoses really won't interchange due to the size difference.
The line going to the radiator could be moved to the water pump (it's a return line) and the fitting at the radiator securely plugged off.
I would check the air vents and vacuum lines to make sure the air gets to the heater core when it should.
__________________


"Off the grid and on the seven day weekend plan"

"One person cannot know everything, but between all of us, there isn't much we don't know."

Last edited by MountainGoat1966; 07-29-2014 at 09:56 PM. Reason: brain fart
MountainGoat1966 is offline   Reply With Quote
Old 07-30-2014, 04:38 AM   #3
donut
Registered User
 
donut's Avatar
 
Join Date: Aug 2009
Location: S.C.
Posts: 1,593
Re: Are my heater core lines routed correctly?

Check to see if it's getting warm to the heater core. You could have trapped air in it. If the HC is warm and coolant flowing ok, they may have forgotten to connect the blend door.
__________________
'86 C-30 dually, 454/tbh400
'73 K-20 350/350/205 (sold )

I'm kinda like duct tape- no real purpose, but handy to have around.
donut is offline   Reply With Quote
Old 07-30-2014, 08:34 AM   #4
bnoon
Registered User
 
Join Date: Jul 2012
Location: Des Moines IA
Posts: 1,250
Re: Are my heater core lines routed correctly?

The coolant lines wouldn't matter one bit. Someone either broke or forgot to hook up the blend door vacuum line (or worse yet, it could have been broken inside the box when it was apart). Good luck! Oh, and go get a refund on that "free"!!!
__________________
- 1981 Sierra 454, NV4500 swap
- 2006 Z06, 25k miles
- 1973 Nova - Project CarNova Virus on Youtube
bnoon is offline   Reply With Quote
Old 07-30-2014, 05:54 PM   #5
cadillac_al
Registered User
 
Join Date: Oct 2013
Location: Maine
Posts: 2,354
Re: Are my heater core lines routed correctly?

The advantage of the heater hose on the radiator is that, when the engine is cold you can take the radiator cap off and you can watch the heater core flow. If it's flowing then it should be getting hot.
__________________
76 Chevy K20
76 GMC K15
77 Chevy C10
77 Chevy K10
cadillac_al is offline   Reply With Quote
Reply

Bookmarks


Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT -4. The time now is 07:05 PM.


Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2024, vBulletin Solutions Inc.
Copyright 1997-2022 67-72chevytrucks.com