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Old 03-18-2005, 02:25 PM
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Upper radiator hose

I put a 500 in my 79 GMC. I Used the original caddy radiator, thermostat and caddy hoses.
Is it normal that the upper rad hose is empty and lacking coolant? the rad is full and does not leak. The engine runs at a steady 220 and doesnt usually go above that unless sitting at idle for quite some time.

Im use to sqeezing sbs and being able to feel coolant within the hoses

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Old 03-18-2005, 03:16 PM
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There should be water in the hose. What thermostat is in there? Is the thermostat working properly? While 220 is not outrageous, it does sound higher than it should be. Is there anyway to bleed the system of air?
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Old 03-18-2005, 03:50 PM
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this is a freshly rebuilt 500, it has a new OEM thermostat rated at 195 and am using all cadillac hoses and radiator. I also had the thing pressure tested prior to instalation. If the engine is cold and i fill the radiator to the top it will just dump the excess into the overflow after it has warmed up. If I do add coolant its not much at all...maybe 15-20oz
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Old 03-18-2005, 07:51 PM
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The upper radiator hose should be hot to the touch and pressurized once the engine is warmed up to operating temp. If the hose never gets hot it's because there is no water flowing through it, probably caused by a faulty thermostat or a large air pocket in the motor. It shouldn't run at 220 sitting at idle, especially if it has a 195 degree thermostat in it. Try bleeding the cooling system again with the radiator cap off and the heater on full high. An air pocket would explain your t-stat not opening and high temperature reading, as a temperature sender will not work properly in an air pocket.
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Old 03-21-2005, 07:35 AM
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In my spare time this weekend I messed with this a bit. Took the thermostat out (was not upside down)and I replaced it with a new one. when it got to 195 the upper hose got preasure but now its running at 230 degrees.
Turned the heater on but the temp didnt even budge.... I guess its time for a new water pump.
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