Cooling water flow
Thread Starter
Racer
Joined: Sep 2005
Posts: 279
Likes: 1
From: montrose colorado
Cooling water flow
Hi All, Can anyone explain the reason that GM started putting the cooling system thermostat in the lower rad hose (suction of pump) instead of the discharge of pump (upper rad hose). Also the fill tank does not go directly to the rad but tee's in to one of the heater core lines. It seems the thermostat being on the suction of the pump, with no obvious way to see water that is getting hot in the motor, would not open at the correct temp. The electric water pump I installed on my ls2 has the thermostat relocated to the top or discharge of the pump.
My ls2 has always been hard to prime the pump when changing out the coolant. Seems it has to heat cycle a couple of times before it will start to circulate correctly.
Any thoughts???
Donald
My ls2 has always been hard to prime the pump when changing out the coolant. Seems it has to heat cycle a couple of times before it will start to circulate correctly.
Any thoughts???
Donald
Melting Slicks
Joined: Sep 2005
Posts: 2,670
Likes: 134
From: merritt island fl
C1 of Year Finalist (stock) 2019
2016 C1 of the Year Finalist
2015 C2 of the Year Finalist
Actually the thermostat does see hot coolant via the heater return line. Gets it on the back side, though, requiring a different design thermostat. That's why your ordinary old chevy thermostat won't work properly if you try to use one.
