Question about 2000 Oldsmobile Alero

1 Answer

Radiator coolant fan

Why does my radiator fan run only when the air conditioner is on?

Posted by on

Ad

1 Answer

  • Level 1:

    An expert who has achieved level 1.

    Corporal:

    An expert that hasĀ over 10 points.

    Mayor:

    An expert whose answer gotĀ voted for 2 times.

    Problem Solver:

    An expert who has answered 5 questions.

  • Contributor
  • 13 Answers

Some car designs only have one radiator fan as opposed to 2 fans. Typically the second smaller fan is specifically for the AC when its turned on. But with the larger single fan design, its turns on when the AC is on regardless. Now if the fan doesnt come on at all at any other time... like to prevent the car from overheating, you may want to check the Engine Coolant Temperature Sensor. Its located on the engine and easy to replace. Can be tricky to find. They only run 20 bucks thankfully.

Posted on Jun 19, 2009

Ad

6 Suggested Answers

6ya6ya
  • 2 Answers

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

Hi,
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.
New users get to try the service completely Free afterwhich it costs $6 per call 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.
Goodluck!

Posted on Jan 02, 2017

Ad
  • 1861 Answers

SOURCE: Radiator fan

You should check the 30 amp "RDI" fuse and the 7.5 ECU-IG fuse. Both fuses are critical to the operation of the fan system. The RDI fuse sends power to the fan #1 relay. The A/C amplifier turns on power to the fan #1 relay, this is why your fan works on A/C.

Now, with no cooling fan under "normal conditions" (A/C off), you need to have a good fan #2 relay, and a good water temp switch. This switch is on the engine, near the thermostat housing (I think); with a single plug, with a white with a blue trace wire going to it. Remove this wire from the sender, and jump it to ground (anywhere on the metal of the engine) with the key on (engine OFF). If the fan starts, you need a new water temp sending unit. If not, then consider a new fan #2 relay. This system is pretty simple.

Posted on Sep 24, 2008

  • 1596 Answers

SOURCE: 95 grand am radiator fan only runs with AC on

Cooling Fan Temp Sensor is the First thing You Check (with what you have described) Cooling Fan Should ALways come On When The A/C is turned On as A/C Adds A Load to Engine, If Temp Sensor is Faulty it Will Not Give GROUND Signal to ECM >For COOLING FAN >RELAY to Give ground and turn ON The Fan.
There ARE 2 temp Sensors that Serve Different Purposes 1 is for Dash READING GAGE & Or TEMP LIGHT the Other is For ECM or Fan Relay (SAME Thing) you Said>""can disconnect the sensor and fan continues to run" < This Leads me to think you Changed the Wrong One. Not Questioning your Skills Just Here to Help.
TEMP SENSOR FOR 3.1L V6 is Located upper RH rear of engine compartment, near exhaust system. Temp SENSOR for 2.3L Engine is Located in LH rear of engine compartment.
I Hope this Helps Lead you to a NON-OVERHEATING Pontiac.
Good Luck and Have A Great Evening. rejakwilson

Posted on Feb 04, 2009

  • 76 Answers

SOURCE: 2001 honda accord, air conditioner is not working,

one fan is for the a/c it will cycle on when the a/c is turned on the other fan should be linked to the temperature sensor. check your fuses if you haven't already. then check your temp sensor. i'm not sure on a honda but most newer cars have multiple sensors so you will have to find out which on is for the fan. also you need to find out if the fan is controled by a pcm as some new model cars have almost everything controled through the powertrain control module

Posted on Mar 07, 2009

  • 366 Answers

SOURCE: Radiator fan stays on and engine runs hotter.

check thermostat,stays closed

Posted on Apr 01, 2009

  • 246 Answers

SOURCE: 2002 Land Rover Freelander radiator and air fan not working

there is a module mounted on the fan shroud that is a common problem. but as always, check fuses, connectors and grounds!

Posted on Feb 17, 2010

Add Your Answer

Uploading: 0%

my-video-file.mp4

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

×

Loading...
Loading...

Related Questions:

2 Answers

The radiator fans stopped working on my 1993 colt vista. what is the problem?


Unless you are in a very hot climate, with no air con working the radiator fan does not normally come on.

Sep 29, 2014 | 1993 Plymouth Colt Vista

2 Answers

Over heating and blowing cold air from heater


Possibly leaking head gasket. Easiest way to check would be to fill radiator full, start engine and watch coolant level in the radiator cap opening. The top radiator hose will become hot when thermostat begins to allow coolant flow through the radiator. You may have to top off the coolant. Still with the radiator cap off watch for water belching out of the radiator neck. If coolant does belch out of the radiator cap neck, refill with water. If it belches out coolant again it would be combustion gassed forcing the coolant out of the radiator.


This process should take about 1/2 hour to diagnose if it is a head gasket leaking combustion gasses into the coolant.


The radiator fan may run once car is shut off to cool engine compartment to prevent gasoline in fuel lines from vaporizing which would cause a condition called "vapor lock". A car won't start if fuel lines are vapor locked.

Good luck, I hope this helps you to figure out the problem.

Apr 17, 2014 | 2005 Buick Rendezvous

2 Answers

Cooling fan runs intermittently and causes the engine to run hot


The cooling fan isn't causing the engine to run hot, it's electrical and cannot heat an engine. It is turning on in response to your engine running hot. Check coolant level and age, if it's still running hot then check the thermostat - it could be stuck closed. If the thermostat is fine and coolant level is full, it could be partially clogged radiator or head gasket problem (a sure sign of bad head gasket is that your coolant keeps disappearing with no leaks).

Apr 02, 2014 | 1998 Lincoln Mark VIII

2 Answers

Radiator electric fan not working


May be a clogged radiator, air in the coolant line, low coolant? fan relays?

Mar 30, 2014 | Pontiac Firebird Cars & Trucks

2 Answers

2002 ford windstar sel overheating


first check coolant level in radiator coolant level sound low.if coolant overflow jug empty.coolant sysyem low, when add coolant to coolant overflow jug coolant level should stay at full cold mark.if coolant level okay,engine overheat while sitting or moving in slow traffic either coolant fan relay or fuse could be bad.or engine coolant temperature sensor could be bad. coolant sensor turn on cooling fan at certain temperature.hot wire check to make sure cooling fan motor not bad or short in wires.if all is good have pcm check it controls fan relay to through the coolant temperature sensor signal when coolant get hot.

Nov 04, 2012 | 2002 Ford Windstar

2 Answers

I have a 2000 Dodge Durango 5.2L that recently overheated. I replaced the old radiator (had a crack) with a new 4.7L...she still overheats. I viewed that the cooling fan wasn't spinning...I chec


check for low coolant level make sure coolant system been bleed from air.make radiator full coolant and coolant reservoir on the full cold mark.if all is good the cooling fan relay could be bad or the engine coolant temperature sensor could be faulty.

Sep 18, 2012 | 2000 Dodge Durango

1 Answer

Overheating


CHANGE THERMOSTAT AND RADIATOR PRESSURE CAP.CHECK COOLANT LEVEL.MAKE SURE YOU HAVE 50/50 ANTIFREEZE AND WATER.MAKE SURE COOLING FANS COMING ON WHEN ENGINE REACHES 190 DEGREES.TO SEE IF COOLANT FANS RUNNING TURN ON CAR AIR CONDITIONER TO SEE IF FANS RUN IF NOT CHECK COOLING FANS FUSES.IF FUSES GOOD I AM LOOKING AT A FAULTY COOLANT TEMPERATURE SENSOR.IF ALL IS GOOD.NO LEAKS AT RADIATOR HOSES + HEATERS HOSES. NO LEAKS AT WATER PUMP WEEP HOLE OR GASKET.NO LEAKS AT RADIATOR.LAST RESORT CHECK ENGINE OIL. IF LOOKS LIKE MILK SHAKE YOU HAVE LEAKING HEAD GASKET.THAT WILL CAUSE ENGINE OVERHEATING.

Jun 23, 2010 | 2000 Cadillac Seville

2 Answers

Radiator cooling fan is not running


try replacing your fan temperature sensor

Aug 26, 2009 | 2000 Chevrolet Venture

Not finding what you are looking for?
2000 Oldsmobile Alero Logo

231 people viewed this question

Ask a Question

Usually answered in minutes!

Top Oldsmobile Experts

yadayada
yadayada

Level 3 Expert

76630 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22219 Answers

Jeff Turcotte
Jeff Turcotte

Level 3 Expert

8514 Answers

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

Answer questions

Manuals & User Guides

Loading...