Question about Oldsmobile Cutlass Supreme

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Had the water pump replaced in Feb. ever since the fans are not spinning or working very well. The thomostat starts climbing when stopped in traffic.

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  • altimira2002 Jul 31, 2009

    Not at all

  • altimira2002 Jul 31, 2009

    No not at all. Never had a problem with my AC or heat prior to replacing the water pump. Returned to the repair shop told me it was electical problem come back another day. I have checked the fuses all working fine.

  • Curt Downs May 11, 2010

    Are the cooling fans working sometimes, or not at all?

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  • Master
  • 3,113 Answers

Replace fan sensor or relay

Posted on Aug 13, 2009

  • honeymokey
    honeymokey Aug 13, 2009

    Replace fan sensor or relay

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2002 lincoln. Ls v8.. burning smell?? Tried to run hot after 15min drive at a red light but when i took off went back to half way? Keeps running hot??


Engine is too hot which is burning oil and road dirt off the engine. Sounds like a bad thermostat or a water pump problem. The radiator may be partially blocked too.

Feb 21, 2016 | Cars & Trucks

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Cooling system health and diagnosis for 90's Mercedes.


This is listed under the 300 series but fits most 90's Mercedes Benz cooling systems.
The first thing most people notice about there Mercedes benz is the the temperature needle climbs or sneaks towards the red in there car. This is not uncommon. Is it wrong or bad for the vehicle? The plain answer is no.
First lets talk about what is going on. The motor heats the water, the thermostat holds most of the water back to keep the block a more constant temperature. The water pump is always pumping while the motor is running so none of the hot water goes the wrong way backwards into the radiator or coolant overflow tank. The radiator is cooling off the coolant by either driving, viscous fan or the electric fan or fans your Mercedes has up front when stopped or slowed. When the thermostat reaches its set temp around 85-95 it fully open until the block fills with cooler water then shuts again, filling the radiator with hot water to be cooled. All in all pretty simple system to keep the block cool and evenly heated to keep stresses down.
Now some do not like the fact there system goes so close to red. Well one contributor is the Air conditioning system. When that compressor kicks on it basically is just a pump that transfers heat out of the car into the engine compartment making the cooling system work harder.
Another cause of climbing heat systems is a failed thermostat closed or open that keeps the system water hot in the block or hot throughout the system. Best fix is to of course replace it. Just follow the top hose unbolt it from the block and insert the new unit with proper gasket and direction and its good to go.
A bad or failing water pump can limit water circulation so if your car doesnt cool off after replacing the thermostat its the next to replace. Kind of not a simple Do It Yourself job with all the belt and pulley issues that may come up due to age. Not impossible just not easy.
Leaks in the system can cause boiling and rising temperatures so look around. The coolant tank small hose to the radiator on either end is normally the first, or even the winshield washer deicer or heater core lines. Cap can go bad but you will normally see a bad gasket on it if it fails.
Radiators can become clogged with scale after years and years of service with limited flushes and not adding distilled water. Sometimes the plastic cracks and just need replaced.
Ok now there are some external parts to the coolant system that directly effect it.
The viscous fan, it can lose the oil it has internally and not spin enough to cool. The rule is with the engine running if you can stop it easily with a rolled up newspaper replace it.
The engine temp sensor is normally 2 wire sensor near the front of the engine close to the intake normally. When it goes bad it will not let the electric fans come on when needed. If your having issues, cheap fix replace it.
The last piece of the system is the electric fan/fans. These have alot of integrated systems to look at if they do not work so just be careful. First there fuse is not in the fuse box. It is a aluminum strip fuse normally located on the firewall inboard of the brake booster in a tootsie roll sized container. When it goes out the fans do not come on. First without the A/C on operation is as follows 105 fans kick on low speed kick off at 95. So as you can see the needle will easily climb close to red in traffic again stay calm this can be normal. When the A/C is engaged (in a system with proper charge and working order) the high speed fan operation will happen independent of engine temp. This is because all the heat being transfered by the compressor as noted earlier.
I hope this sheds some light on some cooling system woes of anyone. This may apply to alot more vehicles but is specific to Mercedes. Operation of the coolant system is similar no matter what car you drive (unless its electric or air cooled of course).
Thank you.

on May 21, 2010 | Mercedes-Benz 300-Class Cars & Trucks

2 Answers

R reg toyota previa over heats. had new pressure cap n tested the head gasket so both of them are fine. is it likely to be the water pump? as its worse wen Im startin n stopping but seems fine wen Im...


It appears that you have a viscous fan hub driving the fan or should I say failing to drive the fan. The fix is to replace it . If you have electric fans then there is a problem in the temp sensor system and the fans are not cutting in on temperature The problem you state is indicated by the fact that when driving there is sufficient air through the radiator to remove the heat from the radiator ..but when driving slow there is no air flow because the fan is not drawing air through the radiator and the temperature climbs until over heat is reached . Typical indicators of fan speed problem is overheating at stop sign/lights, slow heavy traffic driving, slow up hill driving, and rapid cool down as road speed is increased , the faster the speed the cooler the motor

May 15, 2014 | Cars & Trucks

1 Answer

Over heats in stop and go traffic


There are a couple of things you can check.
  1. Check to see if your cooling fans are coming on when the car is starting to overheat. If the fans do not come on, first check to see if the fuse is bad. If the fuse is bad, replace it. If the fuse is good, your coolant temperature sensor is bad and you should replace that. The coolant temperature sensor threads into the back of the radiator and is very easy to replace.
  2. If your fans are working fine, you should have your water pump checked. If your water pump has seized, it won't be circulating your coolant through your engine resulting in an overheating condition.
Good Luck!
~Brandon

Jun 01, 2011 | 2003 Chevrolet Impala

1 Answer

My 2002 Avalanche's air conditioning quits blowing cold air when in stop and go or stopped traffic. The air still blows out, but it is very hot air. Sometimes if I turn it off and then turn it on once my...


You may want to have your fan clutch checked. If the fan on your water pump does not spin very hard when the vehicle is idleing than it doesn't draw air through the condenser and that air keeps the condenser cooler plus it keeps the pressure down on the high side of the ac system. leave comment.

Jun 28, 2010 | 2002 Chevrolet Avalanche

1 Answer

Engine runs between normal and upper normal temp


Don't run the car without a thermostat. It helps the car to reach operating temps quickly. also helps burn off blow by gasses by keeping the temps up and steady. check your radiator level once driving a few miles. Their may have been some air pockets that purged and need to be replaced with additional fluid.

Jun 27, 2009 | 2002 Dodge Stratus

3 Answers

1996 Rodeo overheating


Check to see if there is water in the oil...If there is water in the oil then it could have a head gasket problem..Did you ever replace the thermostat? If it is stuck then it would also cause overheating...Excessive exhaust backpressure because of a clogged catalytic converter could also cause overheating..Also check belt tension and condition. A loose belt that slips may prevent the water pump from circulating coolant fast enough and/or the fan from turning fast for proper cooling...Another thing it could be is a faulty Water pump -- Any wobble in the pump shaft or seepage would call for replacement. In some instances, a pump can cause an engine to overheat if the impeller vanes are badly eroded due to corrosion or if the impeller has come loose from the shaft. The wrong pump may also cause an engine to overheat. Some engines with serpentine drive belts require a special water pump that turns in the opposite direction of those used on the same engine with ordinary V-belts... Also check the Fan -- With mechanical fans, most overheating problems are caused by a faulty fan clutch, though a missing fan shroud can reduce the fan's cooling effectiveness by as much as 50% (depending on the fan's distance from the radiator) which may be enough to cause the engine to overheat in hot weather or when working hard.

Dec 16, 2008 | 1996 Isuzu Rodeo

1 Answer

Temp Guage Rises While in Traffic Stop and Go


it seems to me that your fan is not working properly ,check the relay first you might get lucky.if not i would start looking for a bad connection or in replacing the fan

Nov 23, 2008 | 1994 Pontiac Grand Prix

1 Answer

Radiator Electric Fan Motor on a 2003 Buick Century won't come on when temp gets high


I have a 1997 Buick Century with the same problem. Both my fans work if the A/C is
on as they should. If your turn off the A/C the passanger side fan will not come on
and at an idle the coolant in the radiator will boil, you can hear it in the overflow tank.
If you are driving there is enough air flow thru the radiator that the coolant doesn't
boil and the car doesn't overheat. I have replace the water pump, the thermostat.
and the ETS or engine temperature sensor mounted just above the thermostat in
the thernostat housing, to no avail, I still have the same problem. The only other
thing is the coolant level sensor in the radiator, which I haven't replace yet due
to the fact you have to pull the radiator in order to replace it, which is a major
undertaking. I have a low coolant indicator on all the time on the dash so I have
a pretty good idea the coolanat level sensor is bad. The coolant level is not low
so that sensor is not working as it should. I hope this may help with your problem.
To test you fan raise the hood when it is cold and top off the radiator and fill the
overflow tank to the cold mark. Start the car and let it idle with the A/C off and
see if the drivers side fans comes on. It will have to get to operating temp
before the fan will come on. If it doesn't come on replace the radiator low coolant
sensor on the passanger side of the radiator. If that doesn't fix the problem
replace the thermostat and the Engine Temperature Sensor at the thermostat
housing with an A/C Delco Engine Temperature Sensor. Good Luck..

Sep 26, 2008 | 2001 Buick Century

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