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General E46 Forum
This is the place to get answers, opinions and everything you need related to your E46 (sedan, coupe, convertible and wagon) BMW!

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Old 10-27-2008, 12:43 PM   #1
christraylor2
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Exclamation PLEASE HELP! Brand New Thermostat, Still a problem....

Hey, I replaced my thermostat because my car threw a SES about low coolant and the thermostat. I replaced it, hoping it would fix that and fix my heating problem. However, my heat problem remains, and as I drive my car, the engine temp goes from mid (12 o'clock) headed back to cold. I was wondering if my brand new thermo might be stuck or if there is something else.....
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Old 10-27-2008, 12:52 PM   #2
DesertMotorWorks
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You may still have air in your cooling system. Re-bleed the system, and for good measure, bleed it again.
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Old 10-27-2008, 12:57 PM   #3
christraylor2
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Originally Posted by DesertMotorWorks View Post
You may still have air in your cooling system. Re-bleed the system, and for good measure, bleed it again.
I have tried to find instructions for proper 'bleeding' techniques. Is there anyone with a DIY or a link to a good one out there?
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Old 10-27-2008, 01:28 PM   #4
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"...Turn your car to ignition (do not start), then put the heater temp on high and the fan on full blast (opens the core valves). Then SLOWLY refill. As you fill, you will hear the system burping and gurgling. If you fill slowly enough you will evac all the air in the system. When you get to the top, the bleeder hole will overflow. Contiue to slowly refill until no bubbles come out. Close the bleeder and the cap up..."

http://tuningemotion.com/forum/showthread.php?t=2471
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Old 10-27-2008, 01:53 PM   #5
christraylor2
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Alright, so I just bled the system and there still is no heat and the car goes back towards cold when driving speeds as well. Faulty (new) thermostat or re-bleed once more?
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Old 10-27-2008, 04:41 PM   #6
tko200
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Did check your Final stage Resistor
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Old 10-27-2008, 04:51 PM   #7
christraylor2
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Did check your Final stage Resistor
I don't believe that resistor would cause the temperature to heat up then cool back down, and I am able to control fan setting and do get random bursts of heat....
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Old 10-27-2008, 05:30 PM   #8
vze3t229@verizo
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Replace your watervalve, this should remedy your problem you may have!!
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Old 10-27-2008, 05:38 PM   #9
christraylor2
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Replace your watervalve, this should remedy your problem you may have!!
So it isn't the thermo? And is this DIY, and sounds pricey!
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Old 10-27-2008, 05:55 PM   #10
vze3t229@verizo
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I had the same problem. They changed my water valve under warrenty and my heating in my cabin was restored and my cooling of my engine temp was in the middle where it should be. I do not know your abilities but it should be fairly simple. If you do tackle it yourself ensure you properly bleed your system.
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