GM water pumps

[T Hergen]

Although it doesn't answer the water pump question, for the heater core
bypass valve try GM #14044414.  One side has 3/4" and the other 5/8" 
fittings.  When vacuum is applied, it cuts the water flow to the heater
core and routes the water back to the return line (others I've seen just
shut the water off).  I spliced the vacuum line into my A/C "max" switched
vacuum port, the same port that actuates the recirculate air door.  Check
TSB #06-12-03 (oct '94) for other mods if you're unhappy with your s-10
A/C performance. 

And now, back to efi...

Tom

On Sun, 23 Aug 1998, Scott Schaaf wrote:

> Try a '90 Chevy G20 van with K (350) engine.  They had a valve in the water
> heater line to bypass the heater core in MAX position.   (This is what's on
> MY van)
> 
>             Good Luck,
>                          Scott...
> 
> ----------
> > From: steve ravet <steve at imes.com>
> > To: diyefi <diy_efi at efi332.eng.ohio-state.edu>
> > Subject: GM water pumps
> > Date: Wednesday, August 12, 1998 10:52 AM
> > 
> > I need to find a water pump that fits a GM smallblock V8, reverse
> > rotation, with a heater core return fitting.  My V8 conversion S-10
> > Blazer sprung a leak in the water pump some time ago.  The motor came
> > from a '91 Caprice.  That car had some kind of system where the hot
> > water can be shut off from the heater core completely.  The water pump
> > doesn't have the usual heater core return fitting.  When I swapped the
> > motor I just teed the heater return into the lower radiator hose.  Now
> > that I have to replace it, I want to get a pump with a return water
> > fitting.  It's a serpentine belt system which means it's also reverse
> > rotation.  Can someone give me an application that uses a reverse
> > rotation V8 water pump with a heater return fitting?  I'm thinking that
> > an early 90's full size truck might be the thing, but the parts guy
> > didn't seem too anxious to let me go digging through stock.
> > 
> > Anxiously waiting,
> > 
> > --steve
> > 
> > 
> > --
> > Steve Ravet
> > International Meta Systems
> > http://www.imes.com
> > steve at imes.com
>