Question about 1998 Oldsmobile Silhouette

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98 Olds van, how does the high/low cooling fan work?

My 98 olds van runs great when driving down the road. Back ups or sitting and waiting the temp goes up. After checking the high setting on the cooling fan is not kicking on, have replaced 2 relays. no difference. The fan kicks off. Replaced the fan but that didn't work. the high setting wouldn't kick on with the new fan either. Put a new head gasket on it already. Any ideas? My husband is getting pretty frustrated.

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Stephen

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  • Oldsmobile Master
  • 21,873 Answers

I'm showing three fan relays in the wiring diagram.
The fans are powered by two 30amp maxi fuses. The relays and fan motors are grounded thru the engine computer. The computer takes input from the coolant sensor and the ac control to decide when fans are needed. You would need to know if the computer is grounding the relays, and if not, why not. You may need a scanner to monitor computer output.

Posted on Jun 28, 2013

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5 Related Answers

Curt Downs

  • 1779 Answers

SOURCE: 1994 Cutlass Ciera Runs Hot

If coolant can be detected inside the car, you need to replace the heater core. After it's replaced, the low coolant light should not come on after the heater core is replaced, and the system refilled. If it does, you need to check further. Go w/ the heater core for now, as it will fog up the inside of the car, and become a safety issue.

Posted on Nov 12, 2008

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Anonymous

  • 18 Answers

SOURCE: 92 Olds 98-kills when warm-restarts after cool down

the coil could be breaking down when it gets hot, if it starts after it cools off replace the coil

Posted on May 21, 2009

ourhowse

Dar

  • 2007 Answers

SOURCE: 1991 Oldsmobile Cutlass Ciera idles high

Change your idle control sensor, but first make sure your throttle linkage isn't sticking.

Posted on Jun 03, 2009

roniecon

Ronny Bennett Sr.

  • 6927 Answers

SOURCE: My 2003 Oldsmobile Silhoutte Van overheats when

They should kick in at 218 to 220 degrees,but then they should go off by them selves ,make sure there is no air in the cooling system,and maybe change the coolant sensor,and thermostat,if this problem persist,the radiator would most likely be the problem,if the cooling fans are coming on,it is important they cut off on there own also,this means the engine(radiator)are cooling down,if the cooling fans do not cut off,there is still another problem

Posted on May 10, 2010

Anonymous

  • 2 Answers

SOURCE: died while driving down road-replaced crank

My 1997 Buick Lesabre Custom died on me when I was on the road. Turns over easy without start?

Posted on Mar 09, 2011

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1 Answer

2000 BMW 528i running hot


is the cooling fan cutting in ? run the engine whilst stationary with the hood up , give it a little gas 2000revs and wait for the temp gauge to rise ,the cooling fan should be heard cutting in , and off again once cooled the engine temp down ,this may take 10-15 mins but you have to be sure the fan is cutting in or you may cook the engine

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Engine overheating


it indicates that the fan is not drawing air through the radiator at idle
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if it has electric fans check relays , fuses and coolant temp sensor unit

May 19, 2017 | Oldsmobile Intrigue Cars & Trucks

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I have a '98 Olds Silhouette cooling fans work when A/C is on but will not come on even when temp is above normal operating temp if A/C is off


Just saw your second posting, so the temp is still above normal. Could the sensor
that controls the fan be not reading the heat properly ? The antifreeze/coolant
issue could still be relevant, so I will re-post that info. Tho.
Electric cooling fans will sometimes come on after a vehicle is parked,
(It actually heats up when stopped), but not when it is rolling down the road
because the movement is applying some cooling effect to the engine.
\
If the engine is not actually overheating, then the fans may be working
normally. Also, make sure your water/antifreeze mix is correct by using a
specific gravity tester. It is a tube with 4 or 5 balls, some of which will float
to give you a reading. Contrary to popular belief, More is not better when it
comes to antifreeze/coolant. It needs water to work properly. Too strong a
mix will actually make your vehicle run cold so that the temp sensors and
heater will not function properly. The engine will not achieve proper operating
temperature and may actually damage some of the components by running
it cold, affect timing, spark, etc. This could also cause the symptoms you
describe. The engine would not actually reach the proper heat threshold
until you added the extra demand of the AC heat transfer. But the first criteria
would be whether the engine is actually overheating / or in normal range .
It may be that the colder weather is allowing the sensors to come on a little
later, warming the engine and heater components a bit more than they would
in warmer weather. Would be good to know what the actual coolant temp is.
Could check that with a guage, and also check to see what temp thermostat
you are using. 195 degrees in the winter would be better, 165/180 or so in the
warmer months

Nov 30, 2011 | 1998 Oldsmobile Silhouette

1 Answer

'98 olds silhouette van, cooling fans work when a/c is on but will not work at all when a/c is off


But is the engine overheating ?
Electric cooling fans will sometimes come on after a vehicle is parked,
(It actually heats up when stopped), but not when it is rolling down the road
because the movement is applying some cooling effect to the engine.
\
If the engine is not actually overheating, then the fans may be working
normally. Also, make sure your water/antifreeze mix is correct by using a
specific gravity tester. It is a tube with 4 or 5 balls, some of which will float
to give you a reading. Contrary to popular belief, More is not better when it
comes to antifreeze/coolant. It needs water to work properly. Too strong a
mix will actually make your vehicle run cold so that the temp sensors and
heater will not function properly. The engine will not achieve proper operating
temperature and may actually damage some of the components by running
it cold, affect timing, spark, etc. This could also cause the symptoms you
describe. The engine would not actually reach the proper heat threshold
until you added the extra demand of the AC heat transfer. But the first criteria
would be whether the engine is actually overheating / or in normal range .

Nov 27, 2011 | 1998 Oldsmobile Silhouette

1 Answer

Hey, I'm working on a 2004 Ford Freestar van with a coolant problem. There is no consistency, it happens at low and high speeds. While driving the temp gauge goes from its normal running position,...


do you have access to a good scanner (that reads engine parameters like engine temp?)-your gauge could be bad, you might have an intermittent problem with the cooling fan (connector?), your thermostat could be hanging open or closed, or you might have air in the cooling system.

Sep 05, 2011 | 2004 Ford Freestar

1 Answer

I have a 94 mustang with an electric fan. The fan works perfectly when i start the car and its cold. when the temp of the water gets up to about 185 the fan kicks on . it can idle all day and the fan works...


is the car running hot? some cooling fans never come on going down the road because the air comjng through the front of the vehicle keeps the car cool enough that it doesn't need to come on. but if it is overheating then you may want to check the cooling fan relay.

Jul 19, 2011 | Ford Mustang Cars & Trucks

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The cooling fan on my 2001 ford escort SE will not work normally


Check the coolant temperature with the car stopped. At idle with the hood up keep the thermometer in the coolant. Confirm if the coolant is not overheating but the engine is!!

Run the A/C keeping the thermometer in the coolant and allow the fan to kick on.

If with the A/C on the engine doesn't overheat then it confirms that the low speed on the fan motor is not working. Read the description of the Taurus where the low speed is used for normal operation when temperature is required but the high speed is activated when the A/C is on. The circuit is simple.

In your case the low speed has to be activated for the A/C to go into the high speed. The fact that the high speed is working and low speed is not indicates the low speed of the fan is defective.

Other problems such as the thermostat or plugged cooling system(radiator clogged) could be the root problem!

Hope this helps?
2010-09-05_004249_03_focus_cooling_fan_resistor-3xudhdxidxafwe4mdbsnm14c-4-0.jpg

dual_speed_fan_diagram-3xudhdxidxafwe4mdbsnm14c-4-2.jpg

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1 Answer

Cooling fan


i have lexus ls400 with 250k miles no problems with this car what so ever but, i incounter one problem my temperature gauge to increase to the high reading then goes back down to normal in the middle. no leaksfrom the hoses, no smelling of coolant. replace theromostat. What is the problem? the coolant fan never comes on, is this the problem?

Thanks,
Jeffery

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