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05-07-2017, 09:30 AM | #1 |
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Join Date: Nov 2005
Location: Indiana
Posts: 93
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Heater Core Outlets. Which is Which ?
I just put a 454 in my 94 GMC Sierra 1500. I didn't hook the heater core outlets up because I didn't have any hose on hand at the time. Now I have the hose, but I didn't know which line went where and if it mattered?
So passenger side goes to? And drivers side goes to? Thanks, I'm finally working out the small electrical gremlins from ditching the TBI and going carb. Posted via Mobile Device |
05-07-2017, 09:43 AM | #2 |
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Join Date: Jan 2006
Location: Smithfield, VA
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Re: Heater Core Outlets. Which is Which ?
Mine has the same core but different engine.
Passenger side outlet connects to the water pump Driver side outlet connects to the block |
05-07-2017, 10:18 AM | #3 |
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Location: Indiana
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05-07-2017, 06:35 PM | #4 |
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Join Date: Nov 2005
Location: Indiana
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I looked at my old radiator and one hose went to the radiator. The new radiator has the same hose barb.
My aftermarket intake has a spot for one hose, and the radiator has the barb. So, which one goes to the radiator? And what one goes to the intake? Thanks Posted via Mobile Device |
05-08-2017, 11:28 PM | #5 |
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Location: Little Rock, Arkansas
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Re: Heater Core Outlets. Which is Which ?
This is how I had my big block setup in a 88 I had. Hope this helps you some.
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1979 Sierra Classic Heavy-half 1996 Silverado x-cab "the daily" |
05-09-2017, 06:25 AM | #6 | |
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Join Date: Jan 2006
Location: Smithfield, VA
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Re: Heater Core Outlets. Which is Which ?
Quote:
Are you sure you're not confusing either a transmission cooler line or an oil cooler line to the radiator? If a radiator has a cooler built in, it will have two ports one on top and a lower one. Mine has 2 coolers, engine oil on one side and tranny on the other. I'll put money on you're confusing an oil cooler line. |
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05-09-2017, 07:50 AM | #7 |
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Re: Heater Core Outlets. Which is Which ?
Some of the 88-94 trucks had one of the heater hoses going to the radiator.
If you buy any kind of factory replacement radiator, you will find a 5/8" barb sticking out of the radiator(between the rad cap and the upper fitting for the trans oil cooler. They supply a cap if you don't use the fitting on the radiator. If the old one was at the radiator, that's where I would put the new one. |
05-09-2017, 08:34 AM | #8 | |
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Join Date: Nov 2005
Location: Indiana
Posts: 93
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Re: Heater Core Outlets. Which is Which ?
Quote:
So the donor truck wasn't running that second water pump hose off of it. |
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05-09-2017, 08:40 AM | #9 | |
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Join Date: Nov 2005
Location: Indiana
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Re: Heater Core Outlets. Which is Which ?
Quote:
My aftermarket 4 core aluminum radiator has the exact same outlets in the exact same spots as outlined above. I took pictures before the swap, but I was more concerned with electrical, so the hoses didn't get documented. UUUGGGHHHH ! |
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05-09-2017, 08:44 AM | #10 | |
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Join Date: Nov 2005
Location: Indiana
Posts: 93
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Re: Heater Core Outlets. Which is Which ?
Quote:
As I said in an above post, I had a separate factory tranny cooler I took out during the swap |
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