Water Pump Question - The 1947 - Present Chevrolet & GMC Truck Message Board Network

soule64 · 08-23-2010, 01:01 PM

I was hoping someone might know off-hand which port is pressure and which is the return on an LS engine water pump. I finally got my AC working this weekend (Vintage Air) - works great at idle, but when under load it starts blowing warm air. My Classic Air did the same thing on the '68 and it ended up being the heater hoses being hooked up wrong. I was thinking this might be the same problem, but before I start spilling fluid everywhere I would ask.

glock35ipsc · 08-23-2010, 10:33 PM

Heater hoses? The 5/8" is supply, the 3/4" is return.

*C-10 simplex* · 08-23-2010, 10:46 PM

Why did the factory do this?

______________________________________________________________________________________
Luck, timing, consistency, and persistence are EVERYTHING----especially when pouring concrete.

soule64 · 08-24-2010, 10:15 AM

Quote:

Originally Posted by glock35ipsc

Heater hoses? The 5/8" is supply, the 3/4" is return.

Thanks. Looks like I did it again - I installed the shutoff valve on the 3/4" side. Dang it. I should know better than that...

glock35ipsc · 08-23-2010, 10:51 PM

Do what?

08-23-2010, 01:01 PM	#1
soule64 Registered User Join Date: Feb 2008 Location: Huntsville, AL Posts: 197	Water Pump Question I was hoping someone might know off-hand which port is pressure and which is the return on an LS engine water pump. I finally got my AC working this weekend (Vintage Air) - works great at idle, but when under load it starts blowing warm air. My Classic Air did the same thing on the '68 and it ended up being the heater hoses being hooked up wrong. I was thinking this might be the same problem, but before I start spilling fluid everywhere I would ask. Last edited by soule64; 08-23-2010 at 01:02 PM.

08-23-2010, 10:33 PM	#2
glock35ipsc Next project: 1970 K10 Join Date: Feb 2004 Location: Fort Collins, Colo 80524 Posts: 6,684	Re: Water Pump Question Heater hoses? The 5/8" is supply, the 3/4" is return. __________________ *Bob* 1970 Chevy K10 LWB "Goldie" 350/TH350 *next project!!* 1981 Chevy C10 LWB 355/TH350 - My son's truck LS SWAP FORUM! Tons of LS swap info here! PLEASE CLICK HERE TO SUPPORT THE GREATEST BOARD ON THE NET! CLICK HERE FOR THE FAQ INDEX by KRUE

08-23-2010, 10:46 PM	#3
C-10 simplex Account Suspended Join Date: Dec 2008 Location: indisclosed Posts: 1,515	Re: Water Pump Question Why did the factory do this? ______________________________________________________________________________________ Luck, timing, consistency, and persistence are EVERYTHING----especially when pouring concrete. Last edited by C-10 simplex; 08-23-2010 at 10:47 PM.

08-23-2010, 10:51 PM	#5
glock35ipsc Next project: 1970 K10 Join Date: Feb 2004 Location: Fort Collins, Colo 80524 Posts: 6,684	Re: Water Pump Question Do what? __________________ *Bob* 1970 Chevy K10 LWB "Goldie" 350/TH350 *next project!!* 1981 Chevy C10 LWB 355/TH350 - My son's truck LS SWAP FORUM! Tons of LS swap info here! PLEASE CLICK HERE TO SUPPORT THE GREATEST BOARD ON THE NET! CLICK HERE FOR THE FAQ INDEX by KRUE

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