Mitsubishi Lancer Fan doesn't shut off when the car shuts off
Car doesn't overheat or anything, but the fan seems to fun excessively, whether the car has been running long or not and even if the car is shut off it will run for maybe 30 seconds. One guy at an oil change place suggested the fan relay switch. Does this sound right? Also, where is it located? Under the hood? Under the dash? Anybody know where to find a schematic? Would be great if you could email me directly, too. firstname.lastname@example.org
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Sensors do not always throw codes if they are close to normal parameters, needs to be checked with a scan tool and thermometer.
There is usually a high and a low speed fan relay, as well as a separate A/C fan relay (also high) Your High speed fan relay could be bad, or the fuse for it.
Engine idle surging usually means the coolant is boiling and there is no longer liquid in the throttlebody causing it to go to a high idle because it thinks the engine is cold. Warm coolant closes a valve lowering the idle on most Japanese makes of that year.
Also, sometimes Thermostats stick half open and do not allow enough flow. AND sometimes in neglected cooling systems Water pump Vains are eroded by electralosis causing low coolant flow as well. And a Clogged radiator can also cause this, as by the time the fans run on high it's to late.
The fan is controlled by a thermal "something" This item senses temprature and turns the fan(s) on and off as need be. IF it is on all of the time, Look for sensors in the water system, on the engine, usually up high... You can disconnect one at a time while shut down, and the fans should stop when you get the correct one. Other designs use a relay, but more failure happens at the thermal transducer...
It's probably a bad fan switch. There are two sensors in your cooling system. One is the one that your dashboard reads, the other is the one that turns your fan on and off. If your fan switch is bad, it will make your fan stay on too long or when it doesn't need to be on. Good luck.
the cooling fan should come on about 105-107C and shut off about 95-97C
does the car overheat just sitting running not moving
but if the car overheats on the highway then it's not the fan
check the fan operation run the car till the gauge is over half and watch the fan
if the fan woks then check coolant level if that's ok then try a thermostat
If the car is not running hot,the cooling fan relay is stuck.find the cooling fan relay in with the other relays and fuses,most likely under the hood.They may have put it near the fan,or radiator also,but,no doubt,it would have to be the cooling fan relay that is stuck closed