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Old 02-06-2011, 12:56 AM   #1
offcambersm
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Default part number for an aluminum thermostat housing?

...for a 2004 impreza outback sport 2.5L?

trying to avoid replacing the plastic one every time i change the thermostat.

thanks
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Old 02-06-2011, 01:42 AM   #2
BAN SUVS
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Why are you replacing the plastic one?
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Old 02-06-2011, 01:57 PM   #3
offcambersm
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because it warps and leaks if you reuse it when you put in a new thermostat
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Old 02-06-2011, 09:29 PM   #4
bobbyjimmy
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Your doing it wrong then.
I've still got my original plastic one on the car from when it was new in 2002 and 10+ coolant changes.
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Old 02-06-2011, 10:03 PM   #5
grafton
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I'd like an aluminum housing just for the awesomeness of it

so +1 for the part number
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Old 02-06-2011, 11:24 PM   #6
BAN SUVS
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11060AA071

Phase 1 2.2 should be metal. I have to agree with bobbyjimmy though if yours is "warping" you're doing something wrong.
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Old 02-07-2011, 07:34 AM   #7
Patrick Olsen
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Another vote for "you're doing it wrong".
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Old 02-07-2011, 01:42 PM   #8
grafton
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Quote:
Originally Posted by BAN SUVS View Post
11060AA071

Phase 1 2.2 should be metal. I have to agree with bobbyjimmy though if yours is "warping" you're doing something wrong.
thank you, my phase 1 lego had a plastic one, oh well.

OP if you are having leaks, are you using an OEM thermostat gasket? I used one that came with a timing belt kit and coolant pissed out the housing, the gasket was visibly too thin when compared to the oem gasket.
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Old 02-07-2011, 02:59 PM   #9
BAN SUVS
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Fair warning, I really don't know for sure that part number is metal and not plastic. It's just the oldest 2.2 water neck so I'm going on assumption.
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Old 02-07-2011, 03:44 PM   #10
offcambersm
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i'm actually just going off what my friend told me i should do i.e. get a metal one or always replace the plastic one. She has worked on numerous subies and knows them in and out...maybe here in TX the coolant doesn't cool down enough before entering the housing.

results may vary, yada yada yada.

Mine is metal but i'm ordering parts for my friend...
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Old 02-07-2011, 03:58 PM   #11
BAN SUVS
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The one on your 2004 TS is metal? If so the part number is the same as what I listed before. So it's metal.
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Old 02-07-2011, 06:27 PM   #12
offcambersm
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Quote:
Originally Posted by BAN SUVS View Post
The one on your 2004 TS is metal? If so the part number is the same as what I listed before. So it's metal.
no, the the 04 obs is my friends car. the metal one on my motor is out of a 98 2.2 i bought to replace the blown motor in my 96 L that i'm rebuilding. the guy i bought it from worked at a dealership so he may very well have replaced it himself...making sure to get a metal housing. i guess i need to contact him.

talked to my other friend and she said the warping can be caused by a previous owner over torquing a plastic one. plastic does dissipate heat better though...
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Old 02-08-2011, 09:21 AM   #13
Patrick Olsen
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Quote:
Originally Posted by offcambersm View Post
i'm actually just going off what my friend told me i should do i.e. get a metal one or always replace the plastic one. She has worked on numerous subies and knows them in and out...
Well, apparently she knows something that nobody else that works on Subarus knows. I've read lots and lots of threads about head gasket fixes, timing belt changes, water pump replacements, etc, and have never heard anyone mention anything about replacing the factory plastic thermostat housing with a metal one. I didn't even know a "normal" metal one existed - the only metal thermostat housing I know of is the one that has the additional hose nipple for the OEM oil cooler (as seen here on scoobymods.com).

Quote:
Originally Posted by offcambersm View Post
plastic does dissipate heat better though...
Not even close. Plastic is an insulator. Aluminum is literally about 1000x better at dissipating heat. Not that the heat dissipation ability of the thermostat housing matters in the slightest.
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