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Why is my fan switching on the moment I turn the key?

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I have just bought 2000 Proton Satria, I would like to know if the fans at the radiator to help cool the engine are temperature controlled to switch on or are they supposed to be running from the moment...


yes, they are made that way, if you want to make sure, just wait til it warms and pop the hood, and maybe turn fan switch to low thsat way it will need to start the fan to keep motor cool good luck

Jan 28, 2014 | Cars & Trucks

1 Answer

No power when i turn the key


Sounds like a bad ignition switch or a bad main electrical connection between the battery and the switch. Check all the battery connections and grounds for clean tight connections. Check for power going to the switch.

Oct 23, 2012 | GMC C1500 Cars & Trucks

1 Answer

2003 suburban with a fan that will not turn off after turning off ignition and taking keys out. still blowing


Could be a bad ignition module (key switch) but more likely than not you fried a relay and your fan relay is providing constant hot to your fan. Swap the relay with another one in your system (or with a spare if you have one).

Sep 03, 2012 | 2003 Chevrolet Suburban

1 Answer

Why doesnt the cooling fan come on on my 1993 mercury topaz


You just asked about the one circuit that gives this backyard mechanic nightmares(lol).There is a relay to turn fan on, but whether it is controlled by a simple temperature sensor/switch on the engine, or by your ecu (engine's computer) I don't know.
Until you get a definitive answer from one of our experts here, there is a simple test you can do to make sure fan motor is good. Unplug the connector for motor and check for corrosion in the terminals of the connector. Plug it back in. Look on the thermostat housing or just adjacent to it, for a single wire connector. This is the fan sensor/switch. Unplug it and turn key to on. Fan should start. Be careful of fan blades when key is on: It MAY come on any time key is on. If it doen't come on it may be a bad sensor in the switch-supposed to build resistance as coolant temp. increases, then at certain temp. will turn fan on.
So, fan on? Replace that switch you disconnected. Or, still no fan? Plug sensor back in. Turn key off. Unplug the fan motor again, and use jumper wires from battery to fan terminal connector, just long enough to verify if fan works or not. If fan motor is good, there is a problem with the temp. sensor, or the relay (probably located in fuse box by battery), or the associated wiring, or the computer (IF your fan is controlled by the computer). Then you have just inherited my nightmare. But if fan does not work, you have found the problem. Good luck.

Nov 11, 2011 | 1993 Mercury Topaz

1 Answer

Engine fan turns itself on the moment I turn the ignition key on even when it is very cold. Also the oil gauge shows engine oil as low even when there is enough oil


The engine fan is controlled by a relay and a radiator temperature switch.
Unplug the switch at the radiator, and if the fan still runs, the relay is stuck on.
If you unplug the relay, it should stop. If not, you did not pull correct relay.

Engine oil gauge is for pressure, not level. And pressure should always drop at idle speeds. As long as it is over 40 psi when at higher speeds, then oil should be ok. Normally at idle, the pressure will drop as low as 7 psi.

Jul 11, 2011 | 2001 Audi A4

2 Answers

I turned my car off and something under the hood is still running although all lights and engine is off


The cooling fan can continue to run for a moment or so until the coolant reaches the correct temperature to trigger the switch to turn it off.

Also, sometimes, you can hear the Freon/R134A in the vehicles that have been using the A/C or climate control as it works through the condensor/filter and tubing.

Really nothing else should be working with the switch off at this point.

Good luck

May 15, 2010 | 1996 Volvo 850

1 Answer

Hello, We have a 2006 Sienna. When the ignition


its all electronic and fortune to fix ,cut the solonoid feed wire from the loom the thin one that makes the solonoid click on ,not the big heavy wire and fit another relay using this wire thats wired through the ignition switch so when the ignition is turned off it will isolate the original feed wire to the original solonoid

Apr 25, 2010 | 2006 Toyota Sienna

5 Answers

Cabin fan continues to run when key is out of ignition


Blower relay switch is sticking. Replace a/c heater relay switch located inthe fuse box under the hood.

Oct 07, 2009 | 2004 Saab 9-3

2 Answers

H2 Hummer


Today 11-12-08 my 2003 H2 Hummer would not start. Checked battery it ischarged. Cables tight. Tried to start with portable booster pak. No go. Tridto jump start with my wife's Suburban. Still no go.
When I turn the switch I hear a single click and that is it. No engine turning over. While trying to start with key the headlights go out. Out of ideas, Will take to Chevy garage in am. Will post solution.

Aug 23, 2008 | 2003 Hummer H2

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

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