| |
Click on image for the lowdown. 
====
| | |
7 members (TUTS 59, Bill Hanlon, Otto Skorzeny, 50Chevy3100, cmayna, UnclePaddy, 1 invisible),
129
guests, and
3
robots. | | Key: Admin,
Global Mod,
Mod | | | Forums66 Topics128,042 Posts1,055,509 Members48,424 | | Most Online14,466
Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
Lots of work on Brad's part ... pure enjoyment (and references) for you!
| | THANKS!
For helping keep this great
old truck web site
on the Internet for over 30 years! and not clogged down
with Ads!  Again, thanks!
| | | | Joined: Feb 2008 Posts: 217 Shop Shark | | Shop Shark Joined: Feb 2008 Posts: 217 | I got a shorten water pump from Jim Carter to fit my 235 that will be going into my 46 1/2t. The pump has two threaded openings for fittings just above the radiator hose outlet. Now I know one must be for the heater but whats the other one for? Someone educate me on which opening goes to where please.
Thanks,
Rick........ | | | | | Joined: Apr 2009 Posts: 164 Shop Shark | | Shop Shark Joined: Apr 2009 Posts: 164 | on my 261 one is for the heater and the other goes to the thermistat housing, and on my 235 its plugged. | | | | | Joined: Sep 2001 Posts: 29,269 Bubba - Curmudgeon | | Bubba - Curmudgeon Joined: Sep 2001 Posts: 29,269 |
On my 261 water pump there was an extra hole/fitting on the water pump and an extra hole/fitting on the thermostat/outlet housing.
I have seen the holes used in a different ways:
1. Plugged (and not used)
2. Used for extra heater lines in school buses.
3. Used to heat an intake manifold that is not attached to an exhaust manifold.
4. A line is run from the pump to the thermostat housing (the engine might warm up more slowly but this gets fluid flowing into the head before the thermostat opens - a hole in the thermostat does this but allows less volume through and the engine would warm up more quickly).
| | |
|
|
| |
