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Help fan engine always on bmw X3 E83
28-10-2023, 12:18 PM,
Post: #1
XZBMW  Help fan engine always on bmw X3 E83
Hi guys, I have a X3 E83 30d year 2009 automatic, in this car when engine start go on the cooling fan to max, I have replace cooling fan, but always same problem, I have replace engine temperature sensor but always same problem, I have replace ecu engine (cloned), but always same problem, when engine start cooling fan go to max, in diagnosis temperature is ok if disconnect sensor temp I have error and temperature is wrong, I dont' know what can to be, I have seen when ignition lock is to +15 before start engine the shutter of cooling fan is all open also with engine cold, someone has had this problem?
Thanks in advance
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28-10-2023, 13:12 PM,
Post: #2
RE: Help fan engine always on bmw X3 E83
Check pressure sensor of air conditioner.
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28-10-2023, 15:14 PM,
Post: #3
RE: Help fan engine always on bmw X3 E83
I have check also it, I have tried to disconnect but nothing, the pressure with worked AC is 6 to 8 bar, if I disconnect cooling fan the pressure of AC increase, I read it on diagnosis
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28-10-2023, 15:38 PM,
Post: #4
RE: Help fan engine always on bmw X3 E83
(28-10-2023, 15:14 PM)bmw320d Wrote:  if I disconnect cooling fan the pressure of AC increase

It is normal reaction without cooling.

Do not disconnect pressure sensor, otherwise the cooling fan will turn on at full power.

I don’t remember exactly what kind of cooling pump is on this engine, mechanical or electrical. If it's electrical, then you need to check it also.
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[+] 1 user says Thank You to Vadim AA for this post
28-10-2023, 16:13 PM,
Post: #5
RE: Help fan engine always on bmw X3 E83
ok monday check cooling pump if is mechanical or electrical
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28-10-2023, 20:05 PM,
Post: #6
RE: Help fan engine always on bmw X3 E83
Water pump is fauly or engine mechanical fault
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28-10-2023, 21:14 PM,
Post: #7
RE: Help fan engine always on bmw X3 E83
this is a m57 mechanikal Waterpump. Fan starts at full speed already when you start the engine?
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28-10-2023, 23:58 PM,
Post: #8
RE: Help fan engine always on bmw X3 E83
Check all intake air temperatures and yet double check engine temperature, also gearbox temperature.
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29-10-2023, 10:46 AM, (This post was last modified: 29-10-2023, 10:51 AM by bmw320d.)
Post: #9
RE: Help fan engine always on bmw X3 E83
(28-10-2023, 21:14 PM)bellphegorus Wrote:  this is a m57 mechanikal Waterpump. Fan starts at full speed already when you start the engine?

yes when start engine cooling fan go to max

(28-10-2023, 23:58 PM)kuno24 Wrote:  Check all intake air temperatures and yet double check engine temperature, also gearbox temperature.

I have check temperature cooling engine and temperature intake air, alls the value are ok, temperature of automatic gearbox is correct, in diagnosis bmw write correct

can to be some ecu of car that send temperature wrong and the engine start cooling fan to max?, when ignition is to +15 but not start engine, the frontal shutter of cooling radiator open also with engine cold, when stop ignition the shutter of cooling fan close
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29-10-2023, 11:20 AM,
Post: #10
RE: Help fan engine always on bmw X3 E83
You SURE your AC pressure sensor (and pressure itself of course) is OK??? Disconnecting it WON'T help as then it automatically runs fan on max in emergency mode.

P.S. Not that much of a car left to replace... could be another solution biggrin

P.P.S. Have you read faults at all???

P.P.P.S. Of course IHKA unit and DDE-IHKA comms need to be ok too, as DDE gets AC pressure over the bus. No comms - emergency fan at max too.
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