Question about 1997 Oldsmobile Silhouette
A year ago we had to replace the radiator, water pump and the thermostat now the temp. gauge in the car is jumping around from cold to 1/2 to 1/4 to hot back to 1/2 or 1/4 etc thought it was an air bubble the antifreeze is turning brown like there is rust in it ... but with everything being new not sure where the rust could be coming from??? anyway we once again replaced the thermostat and it is still doing it so we replaced the radiator cap and nope still bouncing we keep bleeding the system for air bubbles and it is still jumping all over the place we actually overheated twice now while it has been jumping. The hose was not even warm so thought it could be the brand new thermostat we put in it????? scratching our heads trying to figure out why it is jumping all over the place ??????
Posted by Anonymous on
If it's turning brown the head gasket has gone, the brown colour is rust from inside the engine.
Posted on Mar 18, 2017
Thermostat installed up side down will not operate. Don't discount the sensor as being bad or have bad connection. The only true way to know is with a independent thermometer. Most coolant has corrosion protection in it. Radiator might need to be boiled out.
Posted on Mar 18, 2017
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Posted on Jan 02, 2017
SOURCE: 1998 aurora
I have had this problem with my 98 aurora and have replaced all the same components. Temp gauge routinely shows 200 on highway (Fine) but in the city in stop and go will get to around 245. I installed a switch to manually turn on the cooling fans by connecting the ground to pin 86 in the relay for the fan(s). Otherwise the fans will not turn on to 245. This fix works but would like to know an actual solution.
Posted on Jul 12, 2008
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
try doing a flushing out the coolant system the factory 150k mile coolant is really not good once you flush it i recommend using the the regular green and not the dexcool
Posted on Apr 12, 2009
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