Question about Ford Fiesta
Or come in when engine warms up
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
No the cooling fan should run continuously.
Posted on May 11, 2014
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
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
The thermostat switch need to be check and change.
Posted on Feb 02, 2010
Testimonial: "Excellent Solution! My frustration is cured. This has annoyed me for two winters. One previous attempt produced no result. Thank you. "
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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