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E46 M3 (2001-2006) Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006.


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Old Wed, Oct-02-2013, 04:05:23 PM   #61
FLIGHTOPS
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Default Re: DIY--E46 M3 Thermostat & W\Pump Replacement

when changing water pump on e46 is it mandatory to change thermostat? also when the pump fails and fluid runs down on belts causing power steering to go out, does the battery light illuminate? I only ask because that was my dilemma. Afterward I lost power. Currently everything works, lights, car turns on. I just have no power steering now and battery light is illuminated. fluid ran down on belt causing it to slip, as well on my alternator causing it not to turn or my fan. Any guidance would be greatly appreciated
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Old Wed, Oct-02-2013, 07:30:45 PM   #62
mpegripper
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Default Re: DIY--E46 M3 Thermostat & W\Pump Replacement

not mandatory to change the thermostat, but there is no reason not to, its cheap and a bad one can easily kill your car

battery light came on cuz of the alternator not giving enough power

clean, replace belts waterpump and thermostat and you should be good
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Old Sat, Oct-05-2013, 12:39:50 AM   #63
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Default Re: DIY--E46 M3 Thermostat & W\Pump Replacement

Doing this job today. 2nd time on an 83k miles car. First one was changed during a "chasing the overheat at the track" effort. This one is b/c the 'new' water pump was leaking at the shaft... I hate this job. The old water pump style was soooo much easier to do without all the convoluted pipe and o-ring manipulations.

Oh well, best get out to the garage and install the new parts. I am replacing the pump, thermostat, tensioner and tensioner pulley, and the belts. Hoses are relatively new and the radiator is a Bimmerworld one, so no need to mess with that!
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Old Sat, Oct-05-2013, 01:17:23 AM   #64
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Default Re: DIY--E46 M3 Thermostat & W\Pump Replacement

Ok, this is infuriating...drip, drip, drip. FML.

New gasket. New o-rings (lubed and no problem installing them), etc.,etc.

Bentley doesn't talk about using sealant, but it appears the lowest bolt in the water pump needs sealant on it as that's where it appears to be leaking. I even put in a new water pump gasket (2nd install) and it dripped from the same spot again. Super pissed off right now...

So, is the WP supposed to go on dry or with sealant? Thanks for your help.
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Old Tue, Jun-17-2014, 05:15:34 PM   #65
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Default Re: DIY--E46 M3 Thermostat & W\Pump Replacement

Old thread revival - is it necessary to remove the airbox to get to remove the thermostat? Looks like in the original photos, the airbox was still on, but the description said to remove it.
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Old Tue, Dec-09-2014, 05:47:54 PM   #66
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Default Re: DIY--E46 M3 Thermostat & W\Pump Replacement

What should labor cost for just water pump and thermostat. I have a bearing noise and know its getting ready to go, but cant drop all the money for the full cooling system replacement.

I bought my car at 90k so I have no idea whats been replaced already (no records except dealer)
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Old Tue, Dec-09-2014, 07:09:22 PM   #67
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Default Re: DIY--E46 M3 Thermostat & W\Pump Replacement

Quote:
Originally Posted by big_greasy_taco View Post
Old thread revival - is it necessary to remove the airbox to get to remove the thermostat? Looks like in the original photos, the airbox was still on, but the description said to remove it.
It makes life a lot easier to take it out and get it out of your way.
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Old Tue, Dec-09-2014, 07:10:48 PM   #68
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Default Re: DIY--E46 M3 Thermostat & W\Pump Replacement

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Originally Posted by Kevpm View Post
What should labor cost for just water pump and thermostat. I have a bearing noise and know its getting ready to go, but cant drop all the money for the full cooling system replacement.

I bought my car at 90k so I have no idea whats been replaced already (no records except dealer)

Are you sure it is the water pump and not one of the tensioner or idler pulleys? Take the belts off and spin the pulleys by hand. If they spin freely (no resistance) then it's time to replace. You can check for play in the water pump shaft at the same time so you'll know right away if it is bad or not.
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Old Wed, Dec-10-2014, 01:35:55 PM   #69
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Default Re: DIY--E46 M3 Thermostat & W\Pump Replacement

Quote:
Originally Posted by Kevpm View Post
What should labor cost for just water pump and thermostat. I have a bearing noise and know its getting ready to go, but cant drop all the money for the full cooling system replacement.

I bought my car at 90k so I have no idea whats been replaced already (no records except dealer)
labor ~$400 at an indy
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Discussing DIY--E46 M3 Thermostat & W\Pump Replacement in the E46 M3 (2001-2006) Forum - Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006. at BMW M3 Forum.com (E30 M3 | E36 M3 | E46 M3 | E92 M3 | F80/X)