v6,v4 etc
state it perfectly

For mine, the fan comes up first. Mine is 4plugs.

@uboma

does yur fan work all throughout when drive or switch off something?
double cell radiator or single cell

more detail
sir
thanks

Engine first, no matter the number of cylinders (including viscous fan coupling, except the mechanical locked fan like PAN XN1 engine in 504 & 505).

Electric and Viscous fan would spin 30 minutes later or so depending on the coolant temperature or with A/C on.

Ikenna

@ Ikenna351

any effect ,if fan come first or last



more detail
below question

does yur fan work all throughout when drive or switch off something?
double cell radiator or single cell

thanks

enquirydon: @uboma

does yur fan work all throughout when drive or switch off something?
double cell radiator or single cell

more detail
sir
thanks

As I turn on the ignition, the fan comes up. But as I try to start the car, the fan stops and engine starts after which the fan continues rolling. I will have to take note when next I'm driving to tell whether the fan works all through or not. I have a single cell radiator.

@uboma

great expression
u are welcome

Engine comes up first in mine, den when the engine gets hot,prolly spanning a period of 5/10 mins, the fan would den come on, work for like 1 min, den go off again...(Dis would repeat itself constantly) I guess dis is as a result of the vehicle thermostat, if ur thermostat has been removed, ur fan would rotate constantly...

@austin4real
my Friend car (Toyota Camry) thermostat has been removed but engine come first and later on the fan start up within 10minutes

enquirydon: @ Ikenna351

any effect ,if fan come first or last

A lot.

1. If your radiator fan comes on first before engine starts or while starting the car at very cold outside temp expecially in the morning, the fans will place heavy load on the Alternator motor. That will make the Alternator motor to drag the Alternator pulley. Because the Alternator pulley is driven by Crankshaft pulley via Auxiallialy belt, the Alternator pulley will cause drag to the belt and the crankshaft will have to work a little bit harder to drive the dragging Alternator pulley, so that it doesnt stall. This will cause severe friction on the crankshaft journals or other lubricating parts in the engine, since the oil is cold and not warm enough to lubricate those parts well. Over labouring the engine when its cold will cause severe friction inside the engine, which with time will become prononced. Thats why cars with climate control system dont switch on the A/C compressor while cranking the engine, even though the A/C button is on. The compressor will start spinning few seconds after the engine has started running, depending on the outside temp. Those electric fans carries so much load. If you want to comfirm what am saying, if your fans are connected to spin constantly, disconnect them at night, start the car, switch on the headlight, go inside the car, have someone connect the fans back, as soon as they start spinning (especially at the speed 2 for Peugeots/highest speed for other brands), you will see the headlights and instrument cluster lights dim and would go brighter when you disconnect them, even with the engine running. Just like what your starter does to the battery while cranking the engine.

2. Another effect is the over cooling of your engine at cold temperature. When you start your car in the morning and wheather is very cold, the fans need to stay off for the engine to warm up faster, so that the engine oil will warmp up faster too and start its lubricating job properly. But with the fans on, the fans will be pushing or sucking the cold air from the radiator and spreading on already cold engine, making it difficult for the cold engine to warm up. Its like pouring very cold water on Ice. Thats why it takes ages for temp gauge of cars with constant spinning fans to rise to the middle of the gauge (normal operating temp for the engine), which make the engine suffer before the gauge finally indicates normal temp.

3. Antother effect is the fan lifespan is shotten. The radiator fan motor is not designed to spin constantly and on high speed or speed 2. Doing that makes them die sooner than expected. Even their bearings too. For example, yoir A/C blower. If you are laways leaving it at speed 4 or full speed, then the blower bearing or motor will give up soon. So doing such connection will make your fans die over and over, no matter how many times you replace them.

Etc.

Ikenna

@ Ikenna351, your post is very informative.

It's the engine even on a V8 auto. The fan only comes on later.

great

This has given me thought. Now I know its normal for car engine to start first and the fan later, buy Mr Ikenna and others, how do I know that the thermostat of my car has been removed? thank you all, cheers!

more idea

Ikenna351:
Engine first, no matter the number of cylinders (including viscous fan coupling, except the mechanical locked fan like PAN XN1 engine in 504 & 505).

Electric and Viscous fan would spin 30 minutes later or so depending on the coolant temperature or with A/C on.

Ikenna

Hello Sir. I am curious about the integrity of my Lexus' radiator fan. When I start it early in the morning at idle and put on the AC, the radiator fan does not spin and sometimes I even wait till the temperature guage go beyond half guage but the radiator fan won't come on. It is until I drive the car, that the fan start working. Should this be?