Question about 1994 Oldsmobile Cutlass Supreme
1994 Oldsmobile Cutlass Supreme 3.4 liter Twin Cam Overhead Aluminum Head Engine---- About 120,000 Miles---Engine overheated, have installed new radiator, water pump, thermostat, all hoses are good, see no signs of blown head gasket, no water in engine oil, no signs of water in oil filler cap, no water out the tailpipe, engine still runs good. Bottom radiator hose does not get hot, no heat from heater,(blows cold air). I have been getting eratic readings from the temp. guage. It will idle in the normal range--then shot up to the red zone when driving--then drop to normal.I disconnected bottom radiator hose with the engine running, no water circulated out from water pump housing, then I disconnected the top radiator hose at the thermostat housing, no water being circulated. I can not understand why the water pump would not be pushing water thru. The owners manuel says there is a special cooling system filling process on the engine, it has 2 vents, one on the thermostat housing, and a heater hose pipe, I followed the recommended filling process, no success. It seems to me that the cooling system does not have enough water in it. Maybe that is why the heater blows cold air. My other thought is that the engine has a pocket of air trapped in the system, but I do not understand why the water pump is not pushing water thru the system. I know that these engines have had problems with overheating and head gaskets, but I have not been able to see any signs of a leaking head gasket, however I have not done a block test on the engine. Do you have any suggestions as to what the problem could be, I do not want to pull the cylinder heads unless I am sure there is a headgasket problem.
There seems to be an air pocket or no antifreeze in engine block. Try this method disconnect upper radiator hose and pour water directly into hose down into engine block until it full. when its filled reconnect hose and fill up radiator. as the vehicle warms up open bleeder valve on the thermostat housing and release air from system. open slowly and BE VERY CAREFUL WATER WILL BE HOT, bleed until you get a steady stream opening and cosing valve. However if all of this don't work. You may have a bad pump. Good Luck
Posted on Dec 27, 2008
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Posted on Jan 02, 2017
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