titefd

Greetings, So Im basically done with my LS1 into a volvo wagon, it all seems good, but the temp goes way past 230F with the a/c on at idle, if I turn the a/c off the engine temp wont go down till I raise the engine RPM. I checked the air being pulled by the radiator fan and noticed that its not that hot untill the rpm is raised indicating that there is little or no flow at idle, it has a new volvo radiator, the engine has a 180degree thermostat, the hoses do not collapse. My heater is connected, but the design of the heater valve stops flow in any direction in or out from the heater fittings.( I dont know if this matters) The engine also has a new ac delco water pump. So I have no idea what may be causing the little or no flow at idle?? Thanks

IK

hotrod51

iTrader: (1)

I just had a new 180 thermostat stick on my 6.0 in my 47 chevy pu.
Naturally this happened while at the Streetrod Nationals in Louisville.
I was able to diagnose this quick with an infra-red digital thermometer. Engine side of the thermostat was hot, while the radiator side was cool. Hope this helps.

titefd

what brand was the thermostat?

01WS6/tamu

iTrader: (37)

Bypass the heater shutoff valve, the ls engines are designed to circulate coolant through the heater core as it warms up. Some people have it blocked without any trouble but this would be quick for you to try and may solve your problem. My s10 was doing this when I test fired it prior to being ready to hook up the heater, after that it was fine.

69LT1Bird

iTrader: (1)

Do you have the stock crank pulley or an under drive?

Oscar Will

Look for a heater valve that sits inline on both heater hoses, when shut off it allows flow back to the pump rather than to just block the flow. I've seen some cooling system problems averted with these valves.

titefd

So basically I can get the stock camaro LS1 heater valve ?

Oscar Will

Camaro doesn't use one, try a 1987 Monte Carlo or something like that.

ls1nova71

iTrader: (4)

Are you sure it's full of coolant? If you just filled the radiator up, it might not be full. I've always had to remove the upper radiator hose at the radiator and pour the coolant in that way it fills the entire engine with coolant. My Nova swap did just as you described the first time I started it. Hope this helps.

01WS6/tamu

iTrader: (37)

One other thing that can cause is it if you capped the steam vent tube instead of plumbing it into the cooling system... I think.

titefd

well shouldnt the OEM heater valve from the car that the LS1 actually came from have the feature that there is flow inbetween the two heater outputs even when the heater core is closed off by the valve ?

01WS6/tamu

iTrader: (37)

The factory Ls1 vehicles do not use a inline heater shut off valve. They have constant coolant flow through the heater core.