Chevy 4.3 thermostat replacement

External Since: Dec 19, 2008 Posts: 1

Hello, on a 1991 Chevy pickup, 4.3 engine, does anyone know if the
thermostat spring faces up or down?? It has reverse flow water pump.
Thanks, Tim

External Since: Oct 30, 2007 Posts: 203

wrote:
> Hello, on a 1991 Chevy pickup, 4.3 engine, does anyone know if the
> thermostat spring faces up or down?? It has reverse flow water pump.
> Thanks, Tim

Down.
As a rule the heat slug gets installed facing the engine. Regardless of
where it's mounted. That way as the engine temperature rises it will
open. Install it backwards and you will probably overheat long before it
opens.

--
Steve W.