Is heater core part of coolant bypass in Chevy 350.

30

Asked by Jan 29, 2015 at 05:55 PM about the Chevrolet C/K 10

Question type: Car Customization

I have a new (to me) 1965 Chevy C10 pickup that seems to be cobbled together. The
heater core just sprung a leak, and in disassembly I discovered that the heat control lever
Bowden cable doesn't connect to anything, there is no diverter flap or heater control
valve. It would be easiest for me to add a heater control valve that just limits or shuts off
the coolant going through the heater core.

I'm unsure if this is safe for the engine - it occurred to me that the heater core (not having
a valve) might be an essential part of the coolant bypass.

The engine isn't what I expected, the stamped letters on the front passenger side of the
block are "CKL" which I think means it is a 1973 350 from Impala, L-65. But I think is is
coupled to a 2-speed Powerglide. Sheesh.

Anyway, considering this engine, is it safe to interrupt the hoses going to the heater core?

Thanks!

11 Answers

50,765

You could just hook the 2 heater hoses together. It will require and adapter and a couple of clamps or you can loop the hose together at the engine thus requiring just 2 hose clamps. Won't hurt a thing, but you won't have any heat.

30

Thanks, Bob. I do have a new heater core, though, and what I'm hoping to do is to be able to control the heat. I just don't know if it's safe for the engine to do it by adding a shutoff valve.

50,765

Pretty sure they used heater water control valves many moons ago in the SB Chevy. Now you got me curious so I will do some investigating.

30

Thanks Bob!

30

These are the two hoses that go to the heater core. Pointing with finger and thumb.

1 of 1 people found this helpful.
50,765

I think the really old small blocks had a short bypass hose from the water pump to the intake manifold and they used a heater water control valve. According to a Hot Rod Mag. article I skimmed the newer small blocks are internally bypassed.

50,765

http://www.hotrod.com/how-to/engine/1404-coolant-bypass-hose-really- neccesary/ article is mainly about big blocks, but the small block is mentioned early in the article.

1 of 1 people found this helpful.
30

Bob, I see where they mention it, does make it sound like the bypass is internal, so I should be able to put the valve inline with the heater hoses. Should I feel confident regarding this?

1 of 1 people found this helpful.
50,765

I would feel confident, but it is not my money or truck. If it were me I would try it thinking it is 95% going to work just fine. Just keep an eye on the temp gauge when you first drive it. I'm in for 95%, but I am just a guy on the internet from Kansas that knows a little about cars. Let me know how it goes.

1 of 1 people found this helpful.
Best Answer Mark helpful
30

Bob, I put it all together and just did a test drive with the heater valve "off" and the engine, based on the temp gauge, seemed to warm up as normal, no spiking. Seems like it's fine! Thanks again.

1 of 1 people found this helpful.
50,765

Glad it worked out for you!

Your Answer

C/K 10

Looking for a Used C/K 10 in your area?

CarGurus has 313 nationwide C/K 10 listings and the tools to find you a great deal.

ZIP:

Chevrolet C/K 10 Experts

  • #1
    CaptPKelly
    Reputation
    770
  • #2
    Rowefast
    Reputation
    370
  • #3
    F_O_R
    Reputation
    360
View All

Related Models For Sale

Used Chevrolet C/K 1500
888 listings starting at $3,195
Used Chevrolet Silverado 1500
2,082 Great Deals out of 181,985 listings starting at $1,898
Used Ford F-150
2,191 Great Deals out of 182,389 listings starting at $1,000
Used Chevrolet Camaro
413 Great Deals out of 31,803 listings starting at $2,395
Used GMC Sierra 1500
763 Great Deals out of 67,982 listings starting at $1,350
Used Chevrolet S-10
6 Great Deals out of 1,283 listings starting at $1,800
Used Chevrolet C/K 2500
203 listings starting at $6,499
Used Ford F-100
164 listings
Used Chevrolet Blazer
3 Great Deals out of 1,152 listings starting at $950
Used Chevrolet Corvette
241 Great Deals out of 22,125 listings starting at $2,500
Used Dodge Ram 1500
402 Great Deals out of 10,683 listings starting at $1,500
Used Chevrolet Impala
578 Great Deals out of 34,582 listings starting at $1,250
Used Ford Mustang
751 Great Deals out of 42,448 listings starting at $1,300

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use.