Question about 1997 Oldsmobile Silhouette

2 Answers

Temp gauge in car goes all over the place from cold to 1/2 to 1/4 to hot back to cool etc.

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 ??????

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  • Oldsmobile Master
  • 1,381 Answers

If it's turning brown the head gasket has gone, the brown colour is rust from inside the engine.

Posted on Mar 18, 2017

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  • Oldsmobile Master
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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

  • 1 Answer

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

  • 740 Answers

SOURCE: engine overheating-----1994 Olds Cutlass Supreme 3.4 liter v/6

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

  • 58 Answers

SOURCE: 2000 olds sillouette van. over heating. replaced

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

  • 103 Answers

SOURCE: 1999 Oldsmobile Cutlass V6 Overheating Problem

Head gasket ? Internal leak ???

Posted on Jul 27, 2009

wracefans24
  • 1985 Answers

SOURCE: 1999 Oldsmobile Bravada Heating Problem

when engine is cold remove radiator cap and check coolant level,sounds like it is really low and has an air pocket in it.

Posted on Dec 11, 2009

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2 Answers

Can a year-old water pump that doesn't leak or make noise just stop pumping ?


The impeller could break loose from the shaft. You would have to remove the pump to find out for sure.
Could be a blockage in one of the passages too.

Apr 13, 2015 | Cars & Trucks

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I have a 02 Grand caravan that has new radiator, termostat, one new fan. the temp gauge goes up to max hot the drops right back down in seconds. what could be the problem?


it could be you have an air lock in the cooling system
remove the rad cap from the rad, start the engine and let it run until the coolant drops (add to fill it back up) or until the coolant boils out of the rad spout.

maybe pull the heat sensor. -replace it OR clean it off, reinstall it.

Mar 12, 2015 | 2002 Dodge Grand Caravan

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Overheating?


Thermostat temperature senecer needs to be replaced

Nov 24, 2012 | Cars & Trucks

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Hi have a 2004 freestar I changed radiator-, water pump , thermostat, engine coolant if I drive on flat street my van runs good temp is normal but if I go uphill the gauge goes up to almost red once I...


Sounds like a faulty temp guage/r a strange malfuntion in a sensor to me as well, only doing it when it going up hill really makes no sense for the way the cooling system works so I doubt that its actually running hot, which is likely why he asked about the gurgling noise, it would force water back into the resivoir if it was running hot assuming that the thermostatic radiator cap is working properly.

Sep 14, 2011 | 2004 Ford Freestar

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Driving with air on gauge goes up and runs hot to red line. flip to heat gauge goes down. start car up after sitting for hours,let idel for 1hour with air on ok,start to drive with air on gauge goes up and...


Did you flush the radiator when you replaced thermostat too? Sounds like it's clogged and the coolant is not circulating as it should. It probably needs to be rodded out or replaced by now.
Check your cooling fans for proper operation. Make sure the outside of the radiator & condensor are clean, and not full of bugs & debris...I hope this helps.

Aug 06, 2011 | 1997 Honda Civic

1 Answer

1998 Saturn Wagon 2 For the last few months my car cooling system seems to be running hotter than normal per the dash gauge. For years and even the the summer the temp gauge would never get over 1/4. I...


I would do a sniff at the tail pipe to make sure you are not pumping coolant out the exhaust pipe.
sound more like a bad gasket than a bad water pump to me.

Jan 27, 2011 | Saturn SW2 Cars & Trucks

1 Answer

The high temp gauge will max out and then back to normal. Also the heat will not work then kick in all of a sudden.


Let me guess...When the temp gauge goes hot, the heater goes cold, and vice versa? Check your coolant level first in the radiator (when the engine is COLD) and also in the overflow reservoir. ONLY use a 50/50 mix of coolant and water, using the same COLOR coolant that is already in the radiator (if it's green, buy green, if it's orange/red, buy orange/red). Next thing to have checked/replaced is the thermostat which is inside the cooling system of the engine. Finally, and the most expensive, have the water pump checked/replaced.

I would put my money on low coolant level in the radiator. As the engine heats up, the coolant will "surge" through the system as the water pump tries to **** air through the system due to low coolant level. If the coolant isn't flowing, the heat can't escape the engine block and it starts to overheat.

Dec 19, 2010 | Chevrolet Monte Carlo Cars & Trucks

1 Answer

Tempature gauge still goes to h


, ckeck the upper hose to see if it is hot , than ckeck the bottom hose , is it cool , the temp sould be about the same .if it is super hot on top and cold at the bottom hose , the raditor may be blocked, and the coolant is not flowing. you can try to flush the radiator . look to see if there metal shaving in the coolant . if there is the radiator is breaking down. this happen to me , my car would over heat change radiator car is a,ok easy fix . radiator barn .com

May 30, 2009 | 1996 Mazda 626

1 Answer

Coolant system


Hello there,

Either an air bubble, the thermostat or the water pump.
  • Air bubble (pocket) - Just because the radiator is full, doesn't mean the engine is. When an air bubble circulates through an engine it will cause the temp gauge to swing from hot (when water is in contact with the sensor) to cold ( when air is in contact). The less water, the hotter the engine. Easiest fix - add water.
  • Thermostat - Keeps water circulating in the engine separate from the water in the radiator until it gets to a certain temperature. At that point, it opens and allows the hot engine water and the cooler radiator water to cycle. Hot to radiator, cool to engine. As the cooler water flows over the thermostat, it closes, allowing the cycle to repeat. If it opens at the wrong temp, or not at all, your engine will overheat. Water will begin to boil. Steam will make the temp gauge swing erratically.
  • Water pump - If the water pump is failing (sometimes the impeller will come of the shaft), the water will not circulate. Same results.
Troubleshoot:
  • First and foremost: BE SAFE!!! Wear safety glasses. Start this with the engine cool. When you look in the radiator, do it from an angle and as far away as possible.
  • Have a hose or a couple two liter bottles full of water.
  • Take off the radiator cap. (Do not take off if engine is hot)
  • Is the water level low? If so, top it off.
  • Make sure the transmission is in either PARK or Neutral and set the parking brake.
  • Start the engine.
  • Observe the water level in the radiator. If it drops, top it off again.
  • At first it should do nothing. The water in the engine is still cool. The thermostat is closed. As the water in the engine heats up, the thermostat will begin to open. When it does, you will notice the water level begin to surge up and down.
  • Check your temp gauge. If the gauge getting close to the 'Red Zone', the thermostat should have begun cycling before now. Go back to the radiator and check it.
  • When (if) the thermostat finally opens all the way, the water will start moving as it cycles through the system. You will be able to tell the difference.
  • If you see the water flowing, the water pump is ok.
  • If the water does not start to move and the gauge is getting close to 'Red', shut the engine down and let it cool. Do not put your face near the radiator. If the thermostat suddenly let go, The hot water, driven by steam, could erupt out of the filler hole. Replace thermostat. Rerun this test. If results are the same, replace water pump.
  • Does the water level drop at this point (air bubble)? If so, top it off while it's circulating. Adding cold water will close the thermostat. Be prepared to wait through the cycling two or three times.
  • Check the temp gauge again. Has it leveled off?
  • When you don't need to add water any more, put the cap back on. Observe the temp gauge for a few more minutes. has it stopped the erratic behavior? If so, it was an air bubble and it's gone. If not, replace the thermostat.
Let me know how it goes. If you have any other problems, click the ASK button.

Remember: Good thing come to those who Rate.

Mike

Jul 28, 2008 | 1998 Saturn SL

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