LT1 Based Engine Tech 1993-1997 LT1/LT4 Engine Related

heater hose connections on water pump

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Old Apr 22, 2005 | 11:07 AM
  #1  
89305rs's Avatar
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heater hose connections on water pump

Ok i checked shoeboxes website and found the coolant line diagram but it didnt show where to connect the lines to. Now there are 3 nipples coming from the waterpump. What do they all go to? I would figure two are for heater core lines but what is the third for??. Could somebody clarify this for me? I need to know what line comes off the waterpump and goes where.
Old Apr 22, 2005 | 11:14 AM
  #2  
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Re: heater hose connections on water pump

Originally Posted by 89305rs
Ok i checked shoeboxes website and found the coolant line diagram but it didnt show where to connect the lines to. ....
It does when I look at it.

The radiator hose diagram shows the third hose.
Old Apr 22, 2005 | 11:30 AM
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Re: heater hose connections on water pump

Ok it is working for me now.
Old Apr 23, 2005 | 08:36 AM
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Re: heater hose connections on water pump

The 3rd hose is the 'bypass' hose' goes to radiator [or oil cooler if so equipped'']
See:
http://shbox.com/1/lt1_water_pumps.jpg
Showing the difference between the various LT1 pumps.[ Note that the F body pump is the only one with the 3rd hose.]
The upper left in the pic is the 5/8 hose, the lower left is the 3/4 hose, and the smaller one on the right is the bypass hose.
If you need a pump, and are doing a swap[it's in an S10 right?] to use a regular radiator, get a B or Y body pump.Note in the pics that they do not have the bypass hose. Makes a swap a lot simpler.

On:
http://shbox.com/1/heater_hoses_93-94.jpg
#7 is the 5/8 hose # 12 is the 3/4 hose.
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