Question about 1990 BMW 5 Series

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Instead of getting one from the dealer go to auto body shop where insurance rates prevail and ask for a aftermarket radiator its inexpensive and it usually has the same or better warranty

Posted on Jan 27, 2009

  • Marc Podeszek Jan 27, 2009

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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.



May 07, 2014 | 1990 BMW 525i

1 Answer

1990 BMW 525i Catalyst

Your BMW may be telling you that its catalytic converter needs attention

May 12, 2013 | BMW 525 Cars & Trucks

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My 1990 BMW 525i is over heating

Try replacing the thermostat. It is supposed to open when the water temp reaches a certain point usually around 180 degrees. It might be stuck in the closed position.

Sep 28, 2012 | 1990 BMW 525i

1 Answer

I have a 93 525i BMW and i keep getting a warning! Coolent level owners manual but its full with coolent, what else could it be?

On the 1990 model 525i (which should be similar), there is a float switch located at the bottom driver side of the radiator in the integrated overflow/fill tank just above the radiator drain. This float switch is what triggers the 'Low Coolant' indication on the dash. The electrical connector faces towards the rear of the radiator and has a rubber boot that protects it. To replace it, pull boot back, remove electrical connector, loosen and unscrew the retaining nut (accessible from underneath the car) and slide the old level switch out and install the new one in reverse.

May 23, 2012 | 1988 BMW 525

1 Answer

My 1990 bmw 535i was overheating, found crack in pastic part of radiator and thermostat. a month later the water pump was leaking i replaced that. now it is losing anti-freeze what appears to be from the...

Sounds like U need to purge the trapped air out & possibly change the thermostat & see if that worx....( you didnt mention if U replaced the radiator)

Jun 13, 2011 | 1990 BMW 5 Series

1 Answer

How easy is it to replace a 1990 BMW 535i thermastat

Quite easy job.

Locate top radiator hose, follow it to the engine, undo the hose. What it is connected to is the thermostat housing. Undo 2-3 bolts connecting it to the engine block. Lift out the thermostat which is a diamond shaped unit.

Replace it with a new one. And refit the pipe. You might need to bleed the radiator in case of any air bubbles. Run the car with the radiator cap off. Top up the coolant level until the fan kicks in twice (20 mins).

Hope this helps and please vote for me, thanks.

Jun 28, 2010 | 1990 BMW 5 Series

1 Answer

BMW keeps running out of water in the rad Please Help

You need to find out if your car is leaking water onto the ground or if it is consuming it internally.

Here is a suggestion: When your car engine is cool, top off the radiator. The next day, before you start it, make sure the radiator is still full, and check under the car for puddles to see if it has leaked. Next,find a dry patch of pavement and start the car and let it warm up. Observe if anything leaks to the ground . If so, you can try to safely see the general location of the leak,to help figure out the problem. Look over all hoses, the radiator, and the water pump area for signs of wetness. If nothing is noted, re check the radiator level after the car cools again. If it is consuming water internally, then you most likely have a head gasket problem.

Jan 18, 2010 | 1990 BMW 5 Series

1 Answer

Anyone know anything about something called "Stop Leak"?

No, this is a dealer trying to get out of replacing an engine. I would talk to a lawyer and have them call the dealership. Stop leak VERY rarely clogs and I have never heard of an engine hurt by today's radiator stop leak. Maybe back when they put black pepper in the radiators to stop leaks that would happen but not now. PLUS BMW's have such great cooling systems that it would never happen.

May 21, 2009 | 2003 BMW 325

2 Answers

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

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

Nov 16, 2008 | 1990 BMW 5 Series

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