Did any 67-72 have heater hose connection @ radiator? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

weim55 · 10-12-2019, 10:36 AM

My '69 CST20 w/350 has a radiator w/heater hose nipple on the right near the top. I don't believe it's original to the truck. The hose connection is blocked off and the heater uses the water pump and intake manifold connections. Is this correct? Also when I had the water pump off noticed the bypass hole has a factory block off dowel in that bypass hole. Thoughts??

Steve weim55 Colorado

**FirstOwner69** · 10-12-2019, 10:57 AM

My '69 CST20 w/350, A/C and original 4 row radiator does not have a nipple on the radiator. The original water pump didn't have any bypass provisions. However, if you ever change to a Vortec engine you'd need a bypass.

LONGHORN1962 · 10-12-2019, 01:06 PM

Probably a replacement radiator. Some big blocks used the radiator fitting 73 up.

67swb72klb · 10-12-2019, 02:45 PM

I have seen them like that on a few trucks over the years I think they were all 4 core radiators...

**Stocker** · 10-12-2019, 03:32 PM

The outlet hose from my heater core goes to that radiator nipple on my '72 K20 with factory A/C.

**FirstOwner69** · 10-12-2019, 03:35 PM

Quote:

Originally Posted by Stocker

The outlet hose from my heater core goes to that radiator nipple on my '72 K20 with factory A/C.

I seem to recall seeing other '72s and perhaps '71s here on the forum that also had the radiator nipple.

67swb72klb · 10-12-2019, 09:40 PM

Quote:

Originally Posted by Stocker

The outlet hose from my heater core goes to that radiator nipple on my '72 K20 with factory A/C.

My 72 K10 air truck also has it too

**71CHEVYSHORTBED402** · 10-12-2019, 10:12 PM

Quote:

Originally Posted by LONGHORN1962

Probably a replacement radiator. Some big blocks used the radiator fitting 73 up.

Hmm. The return line on my 71 BBC with A/C connects between the heater core and radiator. Seems I saw an image in the assembly manual of both examples, one to the radiator, the other to the water pump.

**Pro299** · 10-12-2019, 10:13 PM

My 72 C10 has a heater hose going to the radiator near the top on the passenger side. Pretty sure it's the original radiator. It's a factory AC truck.

**chewychevy67** · 10-12-2019, 10:25 PM

I believe some did. Here's a thread to help. http://67-72chevytrucks.com/vboard/s...d.php?t=634002

weim55 · 10-13-2019, 02:38 PM

Quote:

Originally Posted by FirstOwner69

My '69 CST20 w/350, A/C and original 4 row radiator does not have a nipple on the radiator. The original water pump didn't have any bypass provisions. However, if you ever change to a Vortec engine you'd need a bypass.

Thank you for responding. Your truck is a twin to mine ('69 C20 350-400-factory AC) so a great reference.

Steve weim55 Colorado

weim55 · 10-13-2019, 02:40 PM

Quote:

Originally Posted by chewychevy67

I believe some did. Here's a thread to help. http://67-72chevytrucks.com/vboard/s...d.php?t=634002

Thank you for the link, good information there! Curious if I can find the same info the 1969 model year somewhere (?)

Steve weim55 Colorado

10-12-2019, 10:36 AM	#1
weim55 Registered User Join Date: Jan 2017 Location: Larkspur, Colorado Posts: 916	Did any 67-72 have heater hose connection @ radiator? My '69 CST20 w/350 has a radiator w/heater hose nipple on the right near the top. I don't believe it's original to the truck. The hose connection is blocked off and the heater uses the water pump and intake manifold connections. Is this correct? Also when I had the water pump off noticed the bypass hole has a factory block off dowel in that bypass hole. Thoughts?? Steve weim55 Colorado

10-12-2019, 10:57 AM	#2
FirstOwner69 Senior Member Join Date: May 2010 Location: Wisconsin & Arizona Posts: 4,852	Re: Did any 67-72 have heater hose connection @ radiator? My '69 CST20 w/350, A/C and original 4 row radiator does not have a nipple on the radiator. The original water pump didn't have any bypass provisions. However, if you ever change to a Vortec engine you'd need a bypass.

10-12-2019, 01:06 PM	#3
LONGHORN1962 Registered User Join Date: Apr 2015 Location: Weatherford Oklahoma Posts: 53	Re: Did any 67-72 have heater hose connection @ radiator? Probably a replacement radiator. Some big blocks used the radiator fitting 73 up.

10-12-2019, 02:45 PM	#4
67swb72klb Registered User Join Date: Dec 2010 Location: livingston co.mi Posts: 2,471	Re: Did any 67-72 have heater hose connection @ radiator? I have seen them like that on a few trucks over the years I think they were all 4 core radiators... __________________ California 65 GTO---Texas 64 burb 283 ---Oklahoma 67 CST SWB BBW wood bed 327 2004r---New Mexico 72 k10 350 350 auto---Georga 72 short step project

10-12-2019, 03:32 PM	#5
Stocker 20' Daredevil (Ret) Join Date: May 2003 Location: Jefferson State Posts: 13,722	Re: Did any 67-72 have heater hose connection @ radiator? The outlet hose from my heater core goes to that radiator nipple on my '72 K20 with factory A/C. __________________ - Mike - 1972 K20 LWB 350/350/205 RIP El Jay

10-12-2019, 10:13 PM	#9
Pro299 Junior Member Join Date: Jul 2014 Location: Huntsville, AL Posts: 75	Re: Did any 67-72 have heater hose connection @ radiator? My 72 C10 has a heater hose going to the radiator near the top on the passenger side. Pretty sure it's the original radiator. It's a factory AC truck.

10-12-2019, 10:25 PM	#10
chewychevy67 Senior Member Join Date: Jan 2010 Location: Here Posts: 5,551	Re: Did any 67-72 have heater hose connection @ radiator? I believe some did. Here's a thread to help. http://67-72chevytrucks.com/vboard/s...d.php?t=634002

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