Question about 1996 Oldsmobile Cutlass Supreme Coupe

1 Answer

1996 Cutlass Supreme-Temp shows hot even after engine rebuilt

At approx. 90,000 miles temp gauge showed engine was running hot. Coolant levels would be noted to be low and would be topped off 1-2 times a week, which would fix problem temporarily. There was no leakage of fluids noted on the ground, no smell of coolant, no steam from the engine. Only indicator something was wrong was that the temperature gauge would run up to hot, stay up for a few minutes then drop down to the normal range. Sometimes temp gauge would vacillate up and down during drive. No heat inside car until after them gauge would drop back down into the normal range.
These are the things we have done that have not seemed to fix the
Replaced thermostat- twice, Replaced water pump, replaced heater inlet valve and intake manifold gasket. Bled the coolant system multiple times.
In 12/08 we were driving on the interstate, engine ran hot and this time temp gauge did not drop into normal range. Head gasket blew, warped heads and water was found in the oil. Had engine totally rebuilt by a mechanic. Seemed okay for a couple of weeks but now temp gauge is running up and down again. Have had engine checked out after the recurrence by certified mechanics who cannot find the problem. These mechanics reported excellent work by the original mechanic and did not feel that work done by him was faulty in any way. All gaskets were replaced during original rebuild. Again, no noticible loss of fluids on ground or in engine compartment. No indication of water in oil at this point.
Help! I rely heavily on my car and commute approximately 60 miles a day to get to work. Thanks in advance.

Posted by on

  • Eric Heifetz
    Eric Heifetz May 11, 2010

    First and foremost. WHERE IS THAT COOLANT GOING YOU ARE ADDING 1-2 times a week. It doesnt evaporate. Have you ever placed the cooling system under pressure manually ? #2 Are the electric radiator cooling fans turning on ?



1 Answer

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points


    An expert that got 20 achievements.


    An expert that got 10 achievements.


    An expert that got 5 achievements.

  • Oldsmobile Master
  • 3,828 Answers

Is the temp gauge sender new
or the engine cooling fans spinning fast enough
air in the heating pipes ? bleeding

Posted on Feb 28, 2017


6 Suggested Answers

  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

A 6ya expert can help you resolve that issue over the phone in a minute or two.
Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
The service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
Good luck!

Posted on Jan 02, 2017

  • 193 Answers

SOURCE: Overheating Intrigue

Check your coolant level and see if it is down. If you have checked heads you will notice your engine oil beginning to turn milky white.

If you want a more complete check for cracked heads, plug all spark plugs, and if you can get a coolant pressure tester, pump it up to 12 or 13 psi and then crank the engine over. Watch for water to spray out of one of the cylinders.


Posted on Nov 23, 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

  • 115 Answers

SOURCE: Overheating and Heat doesn't work

Sounds to me like air trapped somewhere in the coolant's path. You said there's a warm spot on top of the engine. This makes me think of possibly a cracked intake manifold or cylinder head. Did it overheat right before this started? I would have the coolant system 'back flushed' and if the problem is still there, I'd next do a compression test (with the radiator cap off).and check to see if there are air bubbles in the radiator while testing. Good luck, please let me know what you find.

Posted on Jan 18, 2009

  • 3854 Answers

SOURCE: My 1999 Oldsmobile Cutlass V6 is running way hot.

Make sure the antifreeze is a 50/50 mix and you may want to replace the temperature sensor. The temperature sensor is on the manifold just in front of the thermostat housing and make sure there is no air in the cooling system. Idle the car and place the heater on high to cycle the coolant through the entire system, with the radiator cap on the first click letting any fluid expansion to follow in to the over flow tank and when the engine cools. The radiator will pull the coolant from the over flow tank, once all the coolant has been cycled and no air in the system. Tighten the radiator cap to the second click and that should help you burp the coolant system. As for the temperature running hot could be a faulty sensor, so replace it and it not that expensive and take under 15 min to replace. Good luck friend. 

Posted on Jul 15, 2009

  • 103 Answers

SOURCE: 1999 Oldsmobile Cutlass V6 Overheating Problem

Head gasket ? Internal leak ???

Posted on Jul 27, 2009

Add Your Answer

Uploading: 0%


Complete. Click "Add" to insert your video. Add



Related Questions:

1 Answer

My 2002 a-6 3.0 suddenly started running rough-engine light is on and blinks at 45mph. runs doggedly

Check oil and coolant levels (at the radiator cap) first. Run fault codes to find which sensor triggered the engine light . The light is to tell you that the engine is in danger of failure so do not dismiss the light as not important.. Hot smells mean that the engine is very hot and you may not have any coolant in the system to activate the temp light or gauge.

Dec 08, 2013 | Audi A6 Cars & Trucks

1 Answer

1997 Olsmobile gauge is showing hot, but the car never over heats.

the coolant temp sensor is probably going bad the spring get's week inside.

Aug 01, 2010 | 1997 Oldsmobile Cutlass Supreme

1 Answer

Whats an engine switch for a oldsmobile 1983 cutlass

there are a few switches for the engine, the coolant temp switch, this controls the temp gauge on the dash, then the coolant fan switch that turns on the fans when engine is hot and then the oil preasure switch that lights the oil light on dash when oil preasure is low, hope this helps.

May 28, 2010 | 1983 Oldsmobile Cutlass Supreme

1 Answer

1997 Mazda 626 (2.0 liter): The check engine or malfunction light came on and will not go off. Since this light came on, the heater/defrost will not blow warm air. Temp guage shows hot after car has been...

sounds like the head or head gasket is blown. your cylinders may be getting coolant in them which will not only cause the motor to lockup, but also cause bent rods and valves. check your oil dipstick and transmission dipstick to see if it looks like water or coolant is presant, also check the coolant to see if it smells like gas or has any kind of oil in it, if so, your head is likely blown.

Dec 05, 2009 | 1997 Mazda 626

1 Answer

1995 cutlass supreme. There are two cooling fans.

it will come on but only when the engine is very hot and the first fan cant cool it down that fast,, its turned on by a difrent heat censor so the engine needs to be realy hot to set the second fan running and it may even then only run for 30 seconds till the engine temp drops off,,, as long as the car is running in the normal heat range dont worry about it,,, if its cooking way up in the red,,,,,now worry about it,,fast too,,

Nov 10, 2009 | 1995 Oldsmobile Cutlass Supreme

1 Answer

Heat goes hot than cold on its own. Engine is at temp.

check your coolant level, if it is to low air gets in the system, may need to bleed air out if it has run low, there is a brass bleeder screw by the thermostat.

Oct 26, 2009 | 1996 Oldsmobile Cutlass Supreme Coupe

1 Answer

Jetta water temp gauge shows temp with engine off and engine cold

try replacing the sending unit, It is easy but did it when the car is cold

May 22, 2009 | 1996 Volkswagen Jetta

1 Answer

97 Hyundai Lantra. Temp gauge shows engine very hot

If the replacement thermostat is good, and installed properly, then the temp sensor might be bad. I hate to tell you ($$$$$) but waterpump could be bad (more expensive)

Feb 21, 2009 | 1997 Hyundai Elantra

1 Answer

Engine overheats when heater pipes connected

I think you could be right about there being air trapped in the system.
Or the heater core(radiator) is plugged.
Either way you need a pressurized radiator coolant pump to put the coolant in without air being trapped.
Although,i have seen it done by jacking the vehicle up high enough that the radiator was now higher than the heater core level, and then the coolant was put in.
But this is dangerous to try.

Jan 29, 2009 | 1999 Ford Escort

Not finding what you are looking for?
Cars & Trucks Logo

139 people viewed this question

Ask a Question

Usually answered in minutes!

Top Oldsmobile Experts


Level 3 Expert

78919 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22326 Answers

Jeffrey Turcotte
Jeffrey Turcotte

Level 3 Expert

8836 Answers

Are you an Oldsmobile Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides