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DIY: Do It Yourself
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Old 01-09-2013, 04:32 AM   #1
KH0
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Cool DIY Thermostat Replacement WITHOUT DRAINING The Coolant!

Hello All,

I am in the process of doing a Thermostat Replacement on my 2000-2001 BMW 323i Manual.

I was just wondering if I would encounter any issues if I were to do the Thermostat Replacement Without Draining The Coolant as the temperature outside is below freezing and I don't want to go through all the trouble.

How much Coolant would it actually spill upon opening the Thermostat and the Hoses?

I would also appreciate any tips / tricks / pointers.

Thank You.

Last edited by KH0; 01-09-2013 at 04:32 AM.
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Old 01-09-2013, 05:02 AM   #2
TurnersInOz
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T-stat and hoses?
Between the bottom hose and t-stat you'll be draining pretty much all of it any way you look at it.
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Old 01-09-2013, 05:06 AM   #3
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If it's just the thermostat and not the hoses, you'll probably only lose a quart of coolant.
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Old 01-09-2013, 05:15 AM   #4
KH0
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Originally Posted by mkodama View Post
If it's just the thermostat and not the hoses, you'll probably only lose a quart of coolant.
Hello,

But don't I need to remove the hoses to get the Thermostat out?

Thank You.
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Old 01-09-2013, 05:15 AM   #5
KH0
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Few people here did it without Draining...

http://forum.e46fanatics.com/showthread.php?t=219433

Last edited by KH0; 01-09-2013 at 05:17 AM.
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Old 01-09-2013, 05:17 AM   #6
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Quote:
Originally Posted by KH0 View Post
Hello,

But don't I need to remove the hoses to get the Thermostat out?

Thank You.
No, just disconnect the ends of the hoses connected to the thermostat.
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Old 01-09-2013, 05:24 AM   #7
KH0
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No, just disconnect the ends of the hoses connected to the thermostat.
Hello,

Yes, that's what I ment

THANK YOU.
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Old 01-09-2013, 10:10 PM   #8
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Very disappointed to find Partially Shorted 10mm Bolts on the bottom.

Halted the process of replacement and the car.

Any Advice?

Thank You.

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Old 01-09-2013, 11:23 PM   #9
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No clue what you just said or what that picture is of.
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Old 01-09-2013, 11:26 PM   #10
KH0
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No clue what you just said or what that picture is of.
LOL

Picture of Bolts that has no thread
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Old 01-10-2013, 02:32 PM   #11
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No clue what you just said or what that picture is of.
Do not use crappy cell phones to take pictures, use a big boy camera.
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Old 01-14-2013, 07:57 PM   #12
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Finally Done

A simple straightforward work that turned into some unexpected issues especially when working below freezing temperatures.

Majority of the unexpected issues will arise when taking apart the old Thermostat.

2 Bolts at the bottom (Rusted, Seized, & Striped)



At first decided to do the work without removing the Electric Fan as I mentioned earlier as the temperature outside was below freezing and I don't want to go through all the trouble, but finally decided to remove it as it was getting harder and harder to disconnect the bottom hose from the Thermostat. I also had a minor issue while removing the fan http://forum.e46fanatics.com/showthr...280&highlight=

When the old Thermostat was out everything went real smoothly.

BTW: You can do it without draining the coolant as it only spills out a handful, but a safe practice would be to washing off the area of the spill before starting the vehicle.

Thank You.

Last edited by KH0; 01-14-2013 at 08:00 PM.
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Old 01-14-2013, 08:39 PM   #13
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Please consult with Mango for all of your cooling question. he is the forum's subject matter expert and should be able to help you more effectively

I hope this helps. Good luck
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Old 01-14-2013, 11:02 PM   #14
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I did this project a week ago and not removing the fan and shroud would make it nearly impossible. There is only a few inches between the components and you certainly don't want to damage the fan.
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Old 01-24-2013, 04:06 PM   #15
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I did this project a week ago and not removing the fan and shroud would make it nearly impossible. There is only a few inches between the components and you certainly don't want to damage the fan.
Not Impossible, But Hard LOL

Last edited by KH0; 01-24-2013 at 04:07 PM.
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