wierd cooling system problem noise ? - Page 3 - The 1947 - Present Chevrolet & GMC Truck Message Board Network

garyd1961 · 01-25-2019, 09:58 PM

Whatever works, I'm glad you got right. Your way should be really good for an AC truck with the cut-off valve in the line. Here is a picture of mine before I installed a new heater core and plumbed it in. It's still the same except now the water runs through the heater core and back to the pump.

SunSoaked · 01-25-2019, 10:10 PM

I got the same setup as k30. Vortec heads and serpentine drive. I never had any problems. This thread made me think so I did some investigating. The ONLY time I don't have flow thru the block/pump is when the thermostat is CLOSED AND the A/C is ON! That's because I have Vintage Air and it uses a heater block off valve that closes of the heater core when the AC is on. For that one rare occasion, I went ahead and installed a bypass hose (see pic). Kept it simple-less than $5 in parts. Problem solved.

sweetk30 · 01-25-2019, 11:36 PM

sun soaked . . . same rpm intake and arp bolts no less and temp sender in the bypass port .

i guess i am the unlucky guy the first 2 didnt work good and it needed the bypass port direct to the intake .

SunSoaked · 01-25-2019, 11:50 PM

Quote:

Originally Posted by sweetk30

sun soaked . . . same rpm intake and arp bolts no less and temp sender in the bypass port .

i guess i am the unlucky guy the first 2 didnt work good and it needed the bypass port direct to the intake .

I'll say it again... those hubcaps are bad luck. Take them off and send to me.

**The Rocknrod** · 01-31-2019, 07:53 AM

Check out this bypass pic from a 65 with a V8 board member cru_zn_29 owns:

sweetk30 · 01-31-2019, 12:26 PM

nice pic .

i got my 90* and 45* barb fittings the other day . when my new intake shows up and gets installed i will post a few pics of the cleaner install and new intake setup i picked to feed the truck .

**The Rocknrod** · 01-31-2019, 01:30 PM

That engine is a 1965 model 327 (or 283?), using a bypass? Old style heads? Hello?

**Captainfab** · 02-01-2019, 12:00 AM

That factory bypass was used on mostly medium duty trucks back in the day but some light duty trucks came with them also.

Quote:

Originally Posted by The Rocknrod

That engine is a 1965 model 327 (or 283?), using a bypass? Old style heads? Hello?

**The Rocknrod** · 02-01-2019, 06:57 AM

Good info. That's something I never realized, so it's not new for small blocks. Interesting.
I looked at 5 different 60's small block cast steel intakes on eBay they all have the bypass nipple attached. I never noticed that before.

**Captainfab** · 02-02-2019, 12:07 AM

The factory small block thermostat bypass you posted a pic of, actually uses a piece that installs under the thermostat housing which the bypass hoses attaches to, What you were seeing on those 5 cast iron intakes is likely the heater hose nipple.

**The Rocknrod** · 02-02-2019, 05:23 AM

Good info there, thank you,

**Captainfab** · 02-03-2019, 12:43 AM

Post #3 in this thread shows what I am talking about.

http://www.67-72chevytrucks.com/vboa...d.php?t=780199

01-25-2019, 09:58 PM	#51
garyd1961 Registered User Join Date: May 2016 Location: Henderson NC Posts: 975	Re: wierd cooling system problem noise ? Whatever works, I'm glad you got right. Your way should be really good for an AC truck with the cut-off valve in the line. Here is a picture of mine before I installed a new heater core and plumbed it in. It's still the same except now the water runs through the heater core and back to the pump.

01-25-2019, 10:10 PM	#52
SunSoaked Registered User Join Date: Dec 2011 Location: Yuma Arizona Posts: 1,524	Re: wierd cooling system problem noise ? I got the same setup as k30. Vortec heads and serpentine drive. I never had any problems. This thread made me think so I did some investigating. The ONLY time I don't have flow thru the block/pump is when the thermostat is CLOSED AND the A/C is ON! That's because I have Vintage Air and it uses a heater block off valve that closes of the heater core when the AC is on. For that one rare occasion, I went ahead and installed a bypass hose (see pic). Kept it simple-less than $5 in parts. Problem solved. Attached Images

01-25-2019, 11:36 PM	#53
sweetk30 Registered User Join Date: May 2012 Location: horseheads,ny rust belt Posts: 2,794	Re: wierd cooling system problem noise ? sun soaked . . . same rpm intake and arp bolts no less and temp sender in the bypass port . i guess i am the unlucky guy the first 2 didnt work good and it needed the bypass port direct to the intake . __________________ 77-k30lb BIG truck build . 87-k30lb budget beater build . 85-k30lb the plow machine build . 85-c10sb summer fun toy . ----------------------------- HOLLEY SNIPER efi = worst case of p.i.t.a i ever had . EDELBROCK pro flo 4 = best deal going so far . love my setup works great.

01-31-2019, 07:53 AM	#55
The Rocknrod Moderator Join Date: Aug 2011 Location: China Spring, TX Posts: 7,280	Re: wierd cooling system problem noise ? Check out this bypass pic from a 65 with a V8 board member cru_zn_29 owns: __________________ Master Chief, US Navy, Retired 1964 C10 Step-side Short Bed - In Progress 2009 2500HD Duramax LTZ 1948 GMC Panel 1956 Big Window Stepside 1953 5 Window Chevy Stepside 1932 Coupe New Seat Foam for Bench Seats?

01-31-2019, 12:26 PM	#56
sweetk30 Registered User Join Date: May 2012 Location: horseheads,ny rust belt Posts: 2,794	Re: wierd cooling system problem noise ? nice pic . i got my 90* and 45* barb fittings the other day . when my new intake shows up and gets installed i will post a few pics of the cleaner install and new intake setup i picked to feed the truck . __________________ 77-k30lb BIG truck build . 87-k30lb budget beater build . 85-k30lb the plow machine build . 85-c10sb summer fun toy . ----------------------------- HOLLEY SNIPER efi = worst case of p.i.t.a i ever had . EDELBROCK pro flo 4 = best deal going so far . love my setup works great.

01-31-2019, 01:30 PM	#57
The Rocknrod Moderator Join Date: Aug 2011 Location: China Spring, TX Posts: 7,280	Re: wierd cooling system problem noise ? That engine is a 1965 model 327 (or 283?), using a bypass? Old style heads? Hello? __________________ Master Chief, US Navy, Retired 1964 C10 Step-side Short Bed - In Progress 2009 2500HD Duramax LTZ 1948 GMC Panel 1956 Big Window Stepside 1953 5 Window Chevy Stepside 1932 Coupe New Seat Foam for Bench Seats?

02-01-2019, 06:57 AM	#59
The Rocknrod Moderator Join Date: Aug 2011 Location: China Spring, TX Posts: 7,280	Re: wierd cooling system problem noise ? Good info. That's something I never realized, so it's not new for small blocks. Interesting. I looked at 5 different 60's small block cast steel intakes on eBay they all have the bypass nipple attached. I never noticed that before. __________________ Master Chief, US Navy, Retired 1964 C10 Step-side Short Bed - In Progress 2009 2500HD Duramax LTZ 1948 GMC Panel 1956 Big Window Stepside 1953 5 Window Chevy Stepside 1932 Coupe New Seat Foam for Bench Seats? Last edited by The Rocknrod; 02-01-2019 at 08:23 AM.

02-02-2019, 12:07 AM	#60
Captainfab 60-66 Nut Join Date: Mar 2007 Location: Coeur d'Alene, Idaho Posts: 23,246	Re: wierd cooling system problem noise ? The factory small block thermostat bypass you posted a pic of, actually uses a piece that installs under the thermostat housing which the bypass hoses attaches to, What you were seeing on those 5 cast iron intakes is likely the heater hose nipple. __________________ Power Steering Box Adapter Plates For Sale HERE Power Brake Booster Adapter Brackets For Sale '63-'66 HERE and '67-'72 HERE and '60-'62 HERE and "60-'62 with clutch HERE Rear Disc Brake Brackets For Sale. Impala SS calipers HERE Camaro Calipers HERE D52 Calipers HERE 6 Lug HERE Hydroboost Mounting Plates HERE

02-02-2019, 05:23 AM	#61
The Rocknrod Moderator Join Date: Aug 2011 Location: China Spring, TX Posts: 7,280	Re: wierd cooling system problem noise ? Good info there, thank you, __________________ Master Chief, US Navy, Retired 1964 C10 Step-side Short Bed - In Progress 2009 2500HD Duramax LTZ 1948 GMC Panel 1956 Big Window Stepside 1953 5 Window Chevy Stepside 1932 Coupe New Seat Foam for Bench Seats?

02-03-2019, 12:43 AM	#62
Captainfab 60-66 Nut Join Date: Mar 2007 Location: Coeur d'Alene, Idaho Posts: 23,246	Re: wierd cooling system problem noise ? Post #3 in this thread shows what I am talking about. http://www.67-72chevytrucks.com/vboa...d.php?t=780199 __________________ Power Steering Box Adapter Plates For Sale HERE Power Brake Booster Adapter Brackets For Sale '63-'66 HERE and '67-'72 HERE and '60-'62 HERE and "60-'62 with clutch HERE Rear Disc Brake Brackets For Sale. Impala SS calipers HERE Camaro Calipers HERE D52 Calipers HERE 6 Lug HERE Hydroboost Mounting Plates HERE



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