Question about Mitsubishi Lancer

1 Answer

Radiator fans won't turn on unless ac is running. why does it do that, how can i fix it?

Posted by on

1 Answer

  • Level 2:

    An expert who has achieved level 2 by getting 100 points

    MVP:

    An expert that got 5 achievements.

    Scholar:

    An expert who has written 20 answers of more than 400 characters.

    Hot-Shot:

    An expert who has answered 20 questions.

  • Expert
  • 83 Answers

Radiator fans only need to run when the engine temperature exceeds a predetermined range for the sensor. I would think the AC bypasses the sensor via a separate circuit. The engine temperature would raise if for example the ambient temperature increases on a hot day or if you were clinmbing hills about the mountains, or if the radiator water level was low etc.

Hope this helps somewhat.

Posted on Sep 14, 2008

Add Your Answer

Uploading: 0%

my-video-file.mp4

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

×

Loading...
Loading...

Related Questions:

1 Answer

Radiator blew due to cooling fans not working, replaced radiator fans will not run unless I turn on ac or pull run rly fuse what is going on?


Check the sensor in the bottom of the radiator is connected and working.The water has to get hot before they come on near boiling point,the air con switch over ride s the normal sensor.

Oct 01, 2016 | 2007 Chevrolet Uplander

3 Answers

Radiator fans do not come on unless A/C is on


Radiator fans come on only when engine reaches certain temperature or AC is switched on.

May 10, 2016 | 2003 Buick Park Avenue Ultra

2 Answers

Hyundai Elantra temperature goes up to HI when air is turned on


There is an electric fan that should come on with the AC and run whenever the AC is on,if it doesn't come on it will heat up very quickly. Sounds like a problem with that radiator mounted fan.
The fan is supposed to come on when the engine gets hot enough also.
If so, the AC should be ok at hiway speeds.But you need the fan to work.

Jul 17, 2013 | Hyundai Motor 2003 Elantra

2 Answers

Radiator fans won't come on while van is running


Start the car and turn on the AC to max. Do either of the fans run with the AC compressor engaged? Also, there is a temp sensor for the fan circuit but I don't know exactly where it is located on that vehicle.

Sep 17, 2012 | 2003 Chrysler Town & Country

1 Answer

1997 Honda CRV temperature gauge spikes to Hot


You have to thank the Gauge that shuts down your engine when hot bec. it wont knock...you have to clean your radiator and see if the coolant inside it run through the radiator holes to the engine water jacket to make sure your engine will not over heat...For the fans, find the fan relay...it's under the hood in the fuse box...

Aug 06, 2012 | 1997 Honda CR-V

1 Answer

I have a 1991 MBZ 2.6 Liter. The front has two fans that are in front of the radiator...All of a sudden the fans are running, when the motor is running; Please tell me what the fans are for ,and why they...


The fans are radiator cooling fans. They are temperature controled so when you first start your engine in the morning they should not run - UNLESS you start it with your AC on. If you turn your AC on one of them should start operating and the other one will kick on when your engine starts getting hot.

Aug 29, 2011 | 1991 Mercedes-Benz E-Class

3 Answers

My 2005 chevy impala 3.8l is overheating. had a new thermostat put on it. noticed that only thedriver side fan come on could that be the problem


if you turn on the ac the other fan should come on, However I don't believe that will cure the problem your having since having the ac fan and the ac turned on pretty much cancel each other out, Putting a new thermostat on Just allows the thermostat to open and close at the set temp that's on the thermostat , Not really fixing the problem, ( unless the thermostat is stuck in the closed position would replacement of it help ) what I would suggest is to completely flush your cooling system, and add new antifreeze, antifreeze like oil breaks down, other heating problems can be caused from the car not tuned properly, check the timing , and components associated with the car running properly, ( plugs, rotor and cap, spark plug wires, )

Aug 03, 2011 | 2005 Chevrolet Impala

1 Answer

How did you know when the cooling fans are not working


You may have one conventional belt-driven fan with a thermal clutch and the other electric or, both could be electric on your car.
The cooling fan that operates during non-AC operation (just a running engine) if electric, will be controlled by a thermal switch in the lower radiator tank and may not turn on at all unless the engine is warmed up. The belt-driven fan should be turning at some speed all the time if the engine is running and at much higher speed with a hot engine.
The fan that cools mostly when the AC is operating won't run under normal operation but may turn on in hot weather (or when the engine is under heavier loads) even without the AC operating.
Checking them would require having a warmed-up engine and the AC turned on. Both fans regardless of type should be turning then.

Jun 03, 2011 | 2000 Mercury Cougar

2 Answers

The radiator fan will not turn on unless the air conditioner is on


try to see the connection if still good..replace it if not...and see the fuse if still working

Oct 24, 2009 | 1993 Saturn SL2

3 Answers

Radiator fan stays on all the time and car runs rough


The fan relay may be malfunctioning (the fan relay is what actually switches the fan on and off and gets its signal from the ECM, which in turn gets its signal from the temp sensor) testing/replacing the relay and temp sensor would be the best thing to start with,... unless you notice any additional (non factory) wire attached to the power wires to the fan.  Sometimes folks, in an attmpt to fix  an overheating or fan relay problem, attach a ignition switched positive lead from the fusebox or other switched source to the positive poer lead on the fan,.. making the fan run whenever the ignition is switched on.   

Jun 11, 2008 | 1995 Geo Metro

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

Related Topics:

186 people viewed this question

Ask a Question

Usually answered in minutes!

Top Mitsubishi Experts

yadayada
yadayada

Level 3 Expert

60792 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

21949 Answers

Jeff Turcotte
Jeff Turcotte

Level 3 Expert

6811 Answers

Are you a Mitsubishi Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...