Register or Log In To remove these advertisements. |
|
|
|
Thread Tools | Display Modes |
|
10-17-2003, 12:41 PM | #1 |
Registered User
Join Date: Mar 2003
Location: Northern Illinois
Posts: 2,181
|
Water pump/radiator question
Hi,
I've got a 71 blazer, manual transmission, no A/C. The PO bastardized pretty much everything in the truck, including (I think) the radiator. Right now the heater core has hose going from the intake, and another from the top of the radiator. The port on the side of the waterpump has been plugged. Here's my question -- How was this originally plumbed? The waterpump that NAPA lists for this truck has no port on the side of it for the heater core. Also, they show a 71 radiator that doesn't have a port for the heater core either! What's up with this? Thanks, Brian |
10-17-2003, 01:51 PM | #2 |
Senior Member
Join Date: Jul 2001
Location: Muskegon,MI,USA
Posts: 6,026
|
This is what my radiator man told me. Trucks with ac should have the outlet on the radiator for the heater. This does not always hold true, but I have seen it setup this way on some original installations. With these trucks over thirty years old, a lot of changes have been done to them over the years.
It is not a bad thing to run the heater to the radiator as far as I can tell. Jim |
10-17-2003, 01:55 PM | #3 |
Inline 69
Join Date: Apr 2003
Location: valleysprings,california
Posts: 1,018
|
pics,,,,,71chevy service manual
ok,this is the way your radiator/heater core is "SUPPOSED" to be hooked up, your gonna get replys that say it doesnt matter how you hook it up ,im just saying this is how its "supposed" to be done according to chevrolet,,jeff
|
10-17-2003, 02:06 PM | #4 |
i love summertime
Join Date: Jul 2002
Location: Kelowna BC
Posts: 4,303
|
my truck is non-ac. i had to replace my leaky rad, the truck was set up with one hose going to the rad and other going to the intake. i got a new rad and it didnt have the fitting in the rad for the hose to clamp on. so i pulled the plug out of the water pump and the hose went there. works like a charm. no problems whats so ever.
Derek
__________________
1967 shortbox stepside Chevy, 365 hp 327, th400. GLOVE BOX LIGHTS FORSALE, click link for info http://67-72chevytrucks.com/vboard/s...d.php?t=273724 |
10-17-2003, 02:15 PM | #5 |
Senior Member
Join Date: Sep 2001
Location: Seattle, WA, USA
Posts: 5,817
|
Yes those drawings are right. Later water pumps (and ones for AC) have a port you can use. I run a long water pump right now, and I have no port on the radiator. That's because the radiator was replaced at some point, and the engine (along with the water pump) came out of an '80 pickup which may or may not have had AC.
Since I'm used to this setup I wouldn't change it. Most of the aftermarket radiators that I'd like to use don't have a port on them, and i don't have a problem running a line to the water pump. I think it looks better anyway.
__________________
'69 3/4 ton C20 2wd-350ci/TH400 '69 3/4 ton Custom 20 2wd-350ci/4sp Manual '99 2wd 5.7 Chevy Tahoe Seattle, WA. |
10-17-2003, 02:20 PM | #6 |
Registered User
Join Date: May 2000
Location: Flin Flon, Manitoba, Canada
Posts: 8,855
|
OK i need to ask another related question here. My 350 will be put in the factory V8 location rather than the inline 6 spot. I have a long water pump on this engine and a clutch fan. Am I going to run into clearance problems with a 4 core rad on this? I currently have the small (2 core??) in there but will be swapping it out. It almost looks like it might hit the rad
__________________
My name's Tim and I'm a truckaholic My 56 Chevy shop truck build http://67-72chevytrucks.com/vboard/s...d.php?t=562795 |
10-17-2003, 03:17 PM | #7 |
Registered User
Join Date: Mar 2003
Location: Northern Illinois
Posts: 2,181
|
Thanks everyone! That was just what I needed!
Dubie, go ahead -- hijack away! Brian |
Bookmarks |
|
|