Heater hose routing - The 1947 - Present Chevrolet & GMC Truck Message Board Network

KEH · 06-06-2003, 05:50 PM

Would someone please tell me the best way to hookup my hoses for a 350 motor. On the previous motor I think the supply line came from the intake beside the thermostat, and the return to the top of the radiator.

I've seen some though that come off the water pump. And also some which have a crossover, which I'm not sure if I need, or where it should go either (the hole on the vertical face of the manifold is only 5/8").

Thanks,
Confused

**Stocker** · 06-06-2003, 07:19 PM

Quote:

Originally posted by KEH On the previous motor I think the supply line came from the intake beside the thermostat, and the return to the top of the radiator.

That's how it is on my 72, with the heater valve in the supply line, which then goes to the lower heater core pipe.

KEH · 06-06-2003, 08:48 PM

Thanks Stocker.

Do I need to have a bypass hose? Why do some use them & some not?

Gordo · 06-06-2003, 10:01 PM

I believe the return line goes into the radiator if the truck had a/c, without a/c it returned into the water pump.

**Stocker** · 06-07-2003, 10:35 AM

Hmm, forgot to mention mine has factory A/C. KEH, sorry, I don't know about the bypass hose.

KEH · 06-07-2003, 02:46 PM

Thanks. I guess I'll not worry about a bypass, unless I hear otherwise.

06-06-2003, 05:50 PM	#1
KEH Better late than never Join Date: Dec 2001 Location: Columbus, IN Posts: 324	Heater hose routing Would someone please tell me the best way to hookup my hoses for a 350 motor. On the previous motor I think the supply line came from the intake beside the thermostat, and the return to the top of the radiator. I've seen some though that come off the water pump. And also some which have a crossover, which I'm not sure if I need, or where it should go either (the hole on the vertical face of the manifold is only 5/8"). Thanks, Confused __________________ 1970 C/10 SWB Stepside

06-06-2003, 08:48 PM	#3
KEH Better late than never Join Date: Dec 2001 Location: Columbus, IN Posts: 324	Thanks Stocker. Do I need to have a bypass hose? Why do some use them & some not? __________________ 1970 C/10 SWB Stepside

06-06-2003, 10:01 PM	#4
Gordo Registered User Join Date: Jan 2001 Location: Killingworth, CT. USA Posts: 3,378	I believe the return line goes into the radiator if the truck had a/c, without a/c it returned into the water pump. __________________ 1971 C10 swb stepside 350/700R4/3.73posi (retired as of 4/22/03) 1998 S10 short bed 2002 S10 Blazer 1942 Oldsmobile 1958 Massey Harris Pony 1951 Wife Killingworth, Connecticut May those who love us, love us, any of those who do not love us, may God turn their hearts. And if God is unable to turn their hearts, may he turn their ankles so we may know them by their limping. A man who works with his hands is a laborer; a man who works with his hands and his brain is a craftsman; but a man who works with his hands and his brain and his heart is an artist.

06-07-2003, 10:35 AM	#5
Stocker 20' Daredevil (Ret) Join Date: May 2003 Location: Jefferson State Posts: 13,498	Hmm, forgot to mention mine has factory A/C. KEH, sorry, I don't know about the bypass hose. __________________ - Mike - 1972 K20 LWB 350/350/205 RIP El Jay

06-07-2003, 02:46 PM	#6
KEH Better late than never Join Date: Dec 2001 Location: Columbus, IN Posts: 324	Thanks. I guess I'll not worry about a bypass, unless I hear otherwise. __________________ 1970 C/10 SWB Stepside



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