Question about 2001 BMW 5 Series

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Over haets some time while driven or sitting still

I have a 1990 bmw 525i the aux fan is not working , and i'm wondering if that helps in cooling the engine down . just replaced the t stat and flush the coolant system. after driving about 20miles from home the temp slowly go to red at highway speeds. while sitting in traffic the neeldle may or may not move over to the red that why i post the one question about the aux fan . also new water pump, and belt . ????????

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  • 11 Answers

The fan makes a difference. Have you checked the fuse for the fan?

Posted on May 20, 2009

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2 Answers

I'm replacing a water pump on my 1990 BMW 525i and I don't no how to remove that thing where the spark plugs go and the rotor 2nd I'm also need to remove the timing belt cover can I get the 3rd bolt out...


STOP what you are doing before you damage something!! Whatever you are trying to remove is not the water pump. Neither the sparkplugs nor the "timing belt" cover needs to come off. Remove the fan belt. Remove the fan (the nut is LH thread- means it turns left to tighten and right to loosen). You will need a large wrench (32mm) availible at sears.The water pump is directly behind the fan and is held in by 4 10mm bolts.

Aug 17, 2014 | 1990 BMW 525i

1 Answer

1990 BMW 525i 2.5L engine overheats after rplaceing water pump, stermostat,fan clucth,radiator


There's trapped air in the cooling system.
  • You need to remove the bleeder screw on top of the radiator when adding water to the expansion tank.
  • With the engine running, pour water into the expansion tank till you see air go out through the bleeder screw's hole.
  • Just keep adding water until no more air bubbles come out then just put the screw back in place.
  • Then fill the expansion tank to it's normal level/line.

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1990-bmw-525i-2-5l-engine-overheats-fibacwft50qlopemjcsdtpdf-4-5.jpg

May 07, 2014 | 1990 BMW 525i

1 Answer

I have a 1990 bmw 525i. once i put in a aftermarket radio,(sony explod). my windsheild wipers, windows, sunroof, dont work,


You probably blew a fuse of knocked out a wiring harness during the install. Check the fuses first, if you don't see anything blown pull the radio back out and be sure all the wiring harnesses in the area near the radio are secure.

Jul 27, 2013 | 1990 BMW 525i

1 Answer

Where is the circuit breaker for the 1990 bmw 525i windows


Have you found the fuse box, under the bonnet on LHS of vehicle?
In the lid of the fuse box it will outline which fuse controls the function.

Apr 09, 2013 | 1990 BMW 525i

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My 1990 BMW 525I bogs down when you push the gas pedal


Fuel Pump and fuel filter change sounds to be what the Dr ordered also change the fuel pressure regulator all at the same time. You will be 100%

Apr 11, 2012 | 1990 BMW 525i

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How to change the fuel filter to a 1993 BMW


You will need fuel line block off clamp

Mar 01, 2012 | 1990 BMW 525i

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1995 BMW 525I over heating issue. I repaired head


Hi, Sounds like you have tried about everything. Ok the aux. coolant switch is for the electric pump for the heater core will not cause an over heating condition just a longer warm up of the heater core. Has the cooling system been bleed properly if there is a trapped air pocket it will not let coolant circulate. Was the new thermostat installed correctly? They have a vent that needs to be towards the top or they trap air on the back side and cant take an accurate reading to open and close. Other areas to look at would be proper operation of the fan clutch, if they fail they can cause the fan to not lock up properly and supply enough air movement through the radiator. The aux. electric fans and their temp switches do you hear them coming on are they coming on at the right temp.

Aug 26, 2010 | 1995 BMW 5 Series

3 Answers

BMW 525i Overheating, already changes thermostat, water pump < what do I check or do next...car has 110K miles


Are you sure the Fan is turning to cool the Engine? If it is not coming on to cool Engine Check the Rad. cooling fan relay.

Jan 04, 2010 | 1995 BMW 5 Series

2 Answers

Prices for bumper, headlights, signals for a 1990 bmw 525i


You can find the latest dealer prices on parts by visiting realoem.com and entering the last 7 digits of your vehicles VIN.

Nov 16, 2008 | 1990 BMW 5 Series

1 Answer

1998 bmw 318i. aux cooling fan does not run. Causing motor to run hot.


check the relay, most probably under the hood, and check the fuse, most probably under the steering wheel near pedals. If u have two fans, most times the 2nd fan is driven by a strap from hte 1st motor, if so, check to see if its broken. If it does need a strap, should turn freely by hand since it has no motor or strap.

Sep 03, 2008 | BMW 318 Cars & Trucks

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