How to hook up heater core? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

smackmatic · 12-13-2009, 03:17 PM

Swaped a the 250 for a 305 tpi engine into my 67, during the summer. Now its geting cold out and I cant figure out where the heater core hooks up to. this engine has no fiting on the water pump. The tpi has been removed, and it has a manifold where I could hook up some fittings, but im not sure which ones. Anyone have any experience with this type of thing?

haysonj · 12-13-2009, 04:30 PM

I took mine off one of the tapped holes in the head then returned it to the inlet side of the water pump. I get more then enough hot air and I don't have the hose on top of the motor.

smackmatic · 12-13-2009, 05:06 PM

Looks like there is a temp sensor in the side of the head, but its kind of close to the header. I guess the heater core return is to the manifold? I just need to find a supply. There are 3 tapped holes in the intake that I have pluged off. There is one on each side of the thrmostat, and one close to the firewall on the drivers side of the engine. Would any of these feed coolant to the heater core?

haysonj · 12-13-2009, 06:17 PM

Your supply has to come off the engine either at the manifold or a head. In order to get circulation it has to return either to the suction side of the water pump or directly to the radiator.

truckguy_69 · 12-15-2009, 09:21 PM

The supply on my 92 camaro is on the back side of the block or the head. i get back to where it is once i find my repair book for it.

12-13-2009, 03:17 PM	#1
smackmatic Registered User Join Date: Nov 2005 Location: DE Posts: 76	How to hook up heater core? Swaped a the 250 for a 305 tpi engine into my 67, during the summer. Now its geting cold out and I cant figure out where the heater core hooks up to. this engine has no fiting on the water pump. The tpi has been removed, and it has a manifold where I could hook up some fittings, but im not sure which ones. Anyone have any experience with this type of thing?

12-13-2009, 04:30 PM	#2
haysonj Registered User Join Date: Dec 2007 Location: Santa Maria, Ca. Posts: 1,423	Re: How to hook up heater core? I took mine off one of the tapped holes in the head then returned it to the inlet side of the water pump. I get more then enough hot air and I don't have the hose on top of the motor. __________________ 69 Chevy 4x4 383 Power

12-13-2009, 05:06 PM	#3
smackmatic Registered User Join Date: Nov 2005 Location: DE Posts: 76	Re: How to hook up heater core? Looks like there is a temp sensor in the side of the head, but its kind of close to the header. I guess the heater core return is to the manifold? I just need to find a supply. There are 3 tapped holes in the intake that I have pluged off. There is one on each side of the thrmostat, and one close to the firewall on the drivers side of the engine. Would any of these feed coolant to the heater core?

12-13-2009, 06:17 PM	#4
haysonj Registered User Join Date: Dec 2007 Location: Santa Maria, Ca. Posts: 1,423	Re: How to hook up heater core? Your supply has to come off the engine either at the manifold or a head. In order to get circulation it has to return either to the suction side of the water pump or directly to the radiator. __________________ 69 Chevy 4x4 383 Power

12-15-2009, 09:21 PM	#5
truckguy_69 Registered User Join Date: Apr 2007 Location: washington Posts: 95	Re: How to hook up heater core? The supply on my 92 camaro is on the back side of the block or the head. i get back to where it is once i find my repair book for it.



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