Question about Ford Fiesta

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Does the engine cooling fan run continually

Or come in when engine warms up

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Fan runs on temperature. Late models run a higher temperatures to older models and have a common engine and A/C condenser fan. What has caused you to focus on the cooling fan?

Posted on May 11, 2014

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No the cooling fan should run continuously.

Posted on May 11, 2014

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It does both.

There was a time, but it has been a very long time (the majority of visitor on this site would have no recollection) since IC engine cooling fans were rigidly mounted and and continuously spun by the engine front crankshaft extension. In more recent decades including rear drive and more recent transverse engines, however, fans, still driven by the crank shaft, have been coupled to the water-pump-impeller drive half shaft by and attached, co-rotating viscous clutch assembly from the rear of which the clutch drive half shaft is joined rigidly to the water pump (impeller drive) half shaft. A pulley comprising a sheave mounted circumferentially on said water pump/clutch drive combined drive shaft, and similar, vibration-damper fitted sheave on crankshaft, and joining pulley belt transfers crankshaft rotation to water pump & fan rotation. Mounted along axis at front of clutch is a helical bimetallic spring (sometimes erroneously called a thermocouple) which expands outward when heated, contact inward with cooling, causing clutch hub internal viscous clutch tighten and loosen, respectively, the clutch\'s grip on its drive shaft, with the effect that by variation of grip, slip, and release by clutch, fan speed quickens and slows to meet the cooling demands of the engine. So, as cold engine is started and begins to run, the coupled clutch-fan assembly is in released-high slippage (declutched) mode allowing fan speed (and fan air draw and exhaust) to be minimal relative to engine turning speed. As engine runs and coolant pump circulated coolant circulates in closed loop within block, gradually warming along with block temperature as heat is sunk to the block, thence to coolant, by combustion chamber fuel burn in the engine head(s). As engine block, and coolant within, heats to operating temperature, coolant in contact with thermostat as front, top of block, releases heat to the thermostat, causing it to open. With thermostat open, hot coolant that "returns" to radiator displaces relatively cool, reserve coolant within, which, in turn, "escapes" at radiator bottom outlet and flows into coolant pump where it joins in circulation through the engine block under coolant pump pressure. As reserve fluid in radiator heats, radiator cooling fins release heat to the air streaming though them under impetus of vehicle forward movement, thus warming the air that contacts the fan clutch thermal clutching coil, causing slippage of clutch to decrease and clutch-fan assembly rotation to speed until it matches engine rotation speed (and engine heating velocity), even approaching engine when no air flow is impelled through radiator except that which is draws by the non-slipping, rotating fan. Thus be controlling fan speed-up and slow-down, the clutch allows the engine to be prime mover in its own temperature regulation, both for warming and for cooling.

Posted on Jan 01, 2015

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No, the only way one of the fans should run all times is if you have the AC on all the time.
Please, a little more info about your car could be helpful next time.
such as Year model, std/auto trans, does is have two cooling fans, etc.....

Posted on May 11, 2014

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Posted on Jan 02, 2017

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SOURCE: 1995 Saab 900 SE Convertible 2.5L V6 runs rough

Most likely air flow metre. Had same problem analysed and replaced and runs perfectly. Not cheap!

Posted on Jun 24, 2009

badealer888
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SOURCE: Engine cooling fan runs after key is removed from ignition

This is normal. It may run for a few minutes especially in hot weather.

Posted on Jun 18, 2009

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SOURCE: engine cooling fan runs all of the time

the fan relay is bad

Posted on Mar 06, 2009

SOURCE: Cooling fan continues to run too long with engine off.

The thermostat switch need to be check and change.

Posted on Feb 02, 2010

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freetek
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SOURCE: 1991 honda accord lx cooling fan

Some vehicles have sensors that can control the electric fan with the ignition off to keep the heat buildup that naturally occurs right after turning off the engine. This can prevent hard starting that can happen with a hot engine. If it is doing this an abnormal amount, the sensor that is operable with the ignition off may be failing. Before turning off the ignition, check to see if the engine temperature is pushing the 'red zone;' if it is, then the fan operation may be normal but your engine may be running hot.

Posted on Feb 05, 2010

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1 Answer

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It is easier to cool a warm engine that to cool an engine at almost over heat condition. So manufacturers run the fan as soon as the engine gets to operating temperature and that gives the cooling system more control of the heat in the system

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I have reno megane 04 my fan continues running when my car is not running i have had the air presureit has just happened again sensor replaced bu


Many cooling systems are designed to let the cooling fan continue to run even after shutting down the engine...however, this should only last for a minute or so...your owners manual may help. If the fan never stops when turned off this is probably a faulty resistor...may need a good mechanic to confirm which...Hope this helps.

Jul 09, 2012 | Cars & Trucks

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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

1 Answer

The cooling fan won't come on. I have power to the fan but it won't come on.I put power directly to the fan motor and it turns on. I have put a new fan relay and still nothing.


Is the engine running hot? The cooling fan won't come on unless the engine temperature rises to a point for the sensor to activate the cooling fan. Did this happen also back in warm weather, or has it just started now in the winter?

Chances are it simply hasn't warmed up enough to kick the fan in. It may well be running while you're driving, but you'd never be aware of it.

Jan 16, 2011 | 1986 Cadillac Eldorado

1 Answer

95 toyota corolla 1.8 engine, cooling fan works but only when you disconnect the fan switch, or by pass the fan relay, it's not overheating, but it's causing the coolant to overflow the resivor. Replaced...


Check the engine main relay, the radiator fan relay no. 1, 30A CDS and FAN fuses, and the ECT (engine coolant temperature) sensor for proper function. For the ECT, there should be continuity when the engine is cold (200F).

Jan 12, 2011 | Toyota Corolla Cars & Trucks

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

2 Answers

Fan continues running after turning off ignition


HI. This will, generally, be the result of the cooling fan switch.

The cooling fan switch on most electric fans monitors coolant temperature signals from the engine control computer. When the engine is cool, the switch opens to keep the fan from spinning. When the engine is warm, the switch closes, thus, turning the fan on for cooling.

I would advise to Inspect the cooling fans(thermal switch),wires and connections. Cooling fan switch problems are often caused by faulty wiring or loose or corroded connections rather than the failure of the switch itself. If the wires or connections are bad, replace them. If you think the switch is defective, it should be tested.

The electric fan cooling switch, or thermal switch, can be tested by placing the element in a bucket of water. Heat the water to approximately 207°-216°F (97°-102°C) and connect the switch leads to an ohmmeter(make sure to keep the switch leads out of the water). The switch should have no continuity until the temperature reaches this level. Let the water cool off below 207°F (97°C) and the switch should lose continuity. If the switch has no continuity at any temperature, replace it.

NOTE_The thermal switch is located on the top of the radiator, usually on the passenger side.


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Dec 16, 2009 | 1998 Volvo C70

1 Answer

My engine fan won't turn off. It runs until the battery dies. Is there anything I can check or do about this?


I suspect the cooling fan relay is stuck and letting the battery power continue to "flow".
Locatye the relay in th engine compartment fuse box ans feel if it is warm and then pull it out. the fan should stop running. If it does, replace that relay with an exact relay of the same voltage/amperage.(see your local auto parts store).

Jul 16, 2009 | 2001 Jeep Grand Cherokee

2 Answers

Car over heating when stopped in traffic but not when movin


Hi. the first test will be to open the hood and inspect the cooling fans. check to see if the fans are activating in intervals during the running cycle. if you don't see any fan rotation at all, this will confirm cooling fan failure and you will need to replace the fans or fan relay. Now, if the fans are running and the car is continuing to run hot when stopped, i would move to the next inspection point. the next problem spot will be a faulty water pump or faulty thermostat


If these two devices are malfunction in any way, it will cause the symptoms you are experiencing. at this point. the first thing is to make sure those fans are actually working.


Please rate and have a great day:)

Apr 28, 2009 | BMW 318 Cars & Trucks

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