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DIY: Do It Yourself
Post here to share or improve your wrench turning skills! All BMW E46 DIY tips, tales, and projects discussed inside. Learn to work on your car and know the right BMW parts you will need!

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Old 05-23-2008, 06:41 PM   #1
umdnoodle
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My Ride: 2001 BMW 330Ci
Which Thermostat

Im on KO Performance and im not sure which t-stat to buy. How do i find out which is right. I have a 2001 330Ci Automatic and according to the website it is giving me two options...
Number 1
Thermostat with Thermostat Housing, Includes Gasket 97 deg. C. This part is manufactured by: BEHR THERMOT-TRONIK. Applications: 323i E46. See below for more applications!
Applications: 330Ci E46

Number 2
Thermostat with Thermostat Housing, Includes Gasket 79 deg. C. This part is manufactured by: WAHLER. Applications: 530i E39. See below for more applications!
Applications: 330Ci E46

Please help...i have the check engine light on and im 99% sure its my thermostat. Thanks guys for any tips.
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Old 05-23-2008, 07:03 PM   #2
GRIDLOCK
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Wahler.
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Old 04-16-2013, 09:00 AM   #3
RMAAS
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Update for future searchers. My replacement Wahler thermostat started leaking fromt the temperature sensor at 11,000 miles and 1 1/2 years on the car. It only had a 1 year warranty from the supplier. I'm going to try a Behr next.
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Old 04-16-2013, 10:05 AM   #4
teamdfl
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Behr and Wahler are equally terrible in my experience. Unfortunately, all the other aftermarket ones are much worse.
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Old 04-16-2013, 10:30 AM   #5
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I havent had a problem with the Wahler thermostats I have used.

I have tried KO in the past, but could never get them to respond to my contact requests. I will never use them.
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Old 04-16-2013, 11:27 AM   #6
paraklas
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Quote:
Originally Posted by RMAAS View Post
Update for future searchers. My replacement Wahler thermostat started leaking fromt the temperature sensor at 11,000 miles and 1 1/2 years on the car. It only had a 1 year warranty from the supplier. I'm going to try a Behr next.
That happened on a Behr too.
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Old 04-16-2013, 11:33 AM   #7
Solidjake
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Yea, both have their weakness but unfortunately there is no other choice.
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Old 04-16-2013, 11:39 AM   #8
bimer21
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My Wahler give me problems, i should go with the Behr
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Old 04-17-2013, 08:46 PM   #9
Sansho
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My Wahler thermostat has been good for 2.5 years and 26K miles.
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Old 04-17-2013, 09:59 PM   #10
tonykim
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The Wahler thermostat I installed started leaking at the gasket after about 12k miles. I bought a Behr unit and noticed that the molded in o-ring was much taller on the Behr unit in comparison to the Wahler. So far the Behr has gone 25k and no issues.
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Old 04-17-2013, 10:01 PM   #11
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Quote:
Originally Posted by tonykim View Post
The Wahler thermostat I installed started leaking at the gasket after about 12k miles. I bought a Behr unit and noticed that the molded in o-ring was much taller on the Behr unit in comparison to the Wahler. So far the Behr has gone 25k and no issues.
When you mean oring are you talking about the gasket?
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Old 04-20-2013, 08:59 AM   #12
tonykim
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yes in the automotive cooling system mfg world it's called a molded in o-ring or gasket.
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