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Old 03-09-2015, 07:05 PM   #1
silverslp
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Default OEM Thermostat Housing

I will be replacing my thermostat soon as my needle on the temp gauge never goes above 1/4. In fear that someone has previously installed the incorrect aftermarket thermostat and housing in this car, I am wondering if there is anything (markings or otherwise) that can tell me whether or not the housing is OEM, especially before I take it off?

I understand this is not the buying / selling thread section, but does anyone have an OEM thermostat housing that they would be willing to sell just in case?

Thank you all in advance.

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Old 03-09-2015, 07:33 PM   #2
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Default Re: OEM Thermostat Housing

Your pick and pull has replacements. The OEM housing has a raised circular casting clock on the side of the neck that and a hose stop diamond are the only marks on it. Thee are not that many of the MOTORAD non OEM units around. You can feel the casting clock with your fingers before trying to remove the one you have. The MOTORAD has the name on the side of it. J N Winkler provided the photos. You can see the external difference.
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File Type: jpg 2014-08-25-thermostat-replacement_0012.jpg (141.2 KB, 56 views)

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Old 03-09-2015, 08:05 PM   #3
silverslp
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Default Re: OEM Thermostat Housing

Thank you for the information and pictures from another member. I didn't know Motorad was the only aftermarket manufacturer. I will look for the circular casing clock on my housing. This is great to know before replacing the thermostat and realizing that the factory Stant 14279 doesn't fit. Thanks again.

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Old 03-09-2015, 08:07 PM   #4
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Default Re: OEM Thermostat Housing

It is much easier to go round up a housing when you need one if you can still use the car. Planing ahead makes this job much easier.

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Old 03-09-2015, 08:13 PM   #5
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Default Re: OEM Thermostat Housing

Quote:
Originally Posted by OldNuc View Post
Planing ahead makes this job much easier.
Exactly, I was trying to plan ahead. Unfortunately we don't have any local pick and pulls so that's why I thought I'd ask here. But I'll check the casing marks first.

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Old 03-09-2015, 08:22 PM   #6
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Default Re: OEM Thermostat Housing

I doubt that there are any spares floating around. I would check with the local yards as many will let you in even if they do not claim to be pick and pull. They might even pull an OEM one for you at a reasonable cost. The aftermarket replacement is both expensive and poor quality. The OEM is aluminum and the MOTORAD looks to be an alloy.

Use this site and search for some part to locate all that are close. http://car-part.com/index.htm

You can search for thermostat housing, looks like a 20.00 part the aftermarket is 28.00 or so.

Last edited by OldNuc; 03-09-2015 at 08:36 PM..

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Old 03-09-2015, 08:39 PM   #7
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Default Re: OEM Thermostat Housing

That's a very useful link. Hopefully I won't need to go that route, but it's great to know there are some out there.

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Old 03-09-2015, 08:40 PM   #8
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Default Re: OEM Thermostat Housing

There are lots, most yards will not list them on this site.

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Old 03-09-2015, 10:31 PM   #9
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Default Re: OEM Thermostat Housing

Quote:
Originally Posted by silverslp View Post
This is great to know before replacing the thermostat and realizing that the factory Stant 14279 doesn't fit. Thanks again.
I suspect that if you wade through post after post in this forum, you will eventually fine the same number of original owners that pulled out a Stant 14279 thermostat as I did. That number being zero.

I don't know who made the factory shipped units, but of all the people that could confirm they pulled the original out that I've seen, they were the ones with the different body design and made in Germany. Just like the one in my photos, which is the original that came out of our '95. They ran cooler and lasted a long freaking time.


I can pick up either of two aftermarket units that come with housings right down the road, both for the same or less than the Stant thermostat alone.

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Old 03-09-2015, 10:48 PM   #10
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Default Re: OEM Thermostat Housing

I have several extras at my place in CA, but I'm not there at the moment. You'll find one.

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Old 03-09-2015, 11:01 PM   #11
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Default Re: OEM Thermostat Housing

OEM Thermostat: 21006335
OEM Thermostat w/ Housing & gasket: 21006065

Both say the same thermostat is for '91-'02, though that doesn't mean that the same thermostat came factory installed '91-'02.

Looks like both Gates and ACDELCO reused the OEM thermostat number for their thermostat, I'd personally trust ACDELCO to be OEM before Stant, Gates or any other yahoo.

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Old 03-09-2015, 11:09 PM   #12
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Default Re: OEM Thermostat Housing

The one on top is a STANT 14279 and the one lower down on the page is a MOTORAD with no name on the housing. That is from Advance Auto.
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Old 03-09-2015, 11:12 PM   #13
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Default Re: OEM Thermostat Housing

Gates is peddling what looks to be the Motorad this week.

I will wait for someone to spend $50.00 for the ACDelco part as it is also all over Amazon and eBay

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Old 03-09-2015, 11:20 PM   #14
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Default Re: OEM Thermostat Housing

silverslp
Beware you may find an aftermarket housing that uses the non standard thermostat with no markings of any kind on it.

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Old 03-10-2015, 07:51 AM   #15
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Default Re: OEM Thermostat Housing

Quote:
Originally Posted by fetchitfido View Post
OEM Thermostat: 21006335
OEM Thermostat w/ Housing & gasket: 21006065

Both say the same thermostat is for '91-'02, though that doesn't mean that the same thermostat came factory installed '91-'02.

Looks like both Gates and ACDELCO reused the OEM thermostat number for their thermostat, I'd personally trust ACDELCO to be OEM before Stant, Gates or any other yahoo.
Having seen only one type come out of the cars as original, I'll trust it to be OEM type when I see one that looks like the one that came out of my car.

I just don't know if anyone still makes or sells them. I remember ehunter found one that looked the same except colored black when he was searching for a new housing for his Stant. IIRC he also had a Murray unit in the car before all his change/housing issues and said the Murray worked fine. My local place shows the photo of the Motorad with the Murray number, but I'm not sure how they would be marked. But in either case the Murray they list comes with a housing.

I'm just glad I know I have an original housing, so I have options.

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Old 03-10-2015, 08:01 AM   #16
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Default Re: OEM Thermostat Housing

If you have to have an old black one start searching for a NOS 21006065, there are a few out there yet.

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Old 03-10-2015, 03:41 PM   #17
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Default Re: OEM Thermostat Housing

Quote:
Originally Posted by OldNuc View Post
If you have to have an old black one start searching for a NOS 21006065, there are a few out there yet.
My only concern is that the correct thermostat (Stant 14279) fits in the housing properly and that the housing doesn't cause the temp to be off.

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Old 03-10-2015, 05:23 PM   #18
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Default Re: OEM Thermostat Housing

They work fine and seem to last fine as well. The problems of ~2008 seem to have been solved. As long as it actually controls temperature you are good. Anywhere between 3/8 and 1/2 is OK as the ECTS does control the indication and it is far from a precision instrument.

When refilling the system after replacing thermostat use a full gallon of 100% antifreeze and top off with distilled water. That way you get the 5+ years of service life and full freeze/boil protection.

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Old 03-10-2015, 07:23 PM   #19
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Default Re: OEM Thermostat Housing

Quote:
Originally Posted by OldNuc View Post
They work fine and seem to last fine as well. The problems of ~2008 seem to have been solved. As long as it actually controls temperature you are good. Anywhere between 3/8 and 1/2 is OK as the ECTS does control the indication and it is far from a precision instrument.

When refilling the system after replacing thermostat use a full gallon of 100% antifreeze and top off with distilled water. That way you get the 5+ years of service life and full freeze/boil protection.
Oh okay, I read quite a few examples of people who couldn't fit the Stant thermostat in the housing, so I wanted to be sure. I will do the coolant method you suggested. Thanks.

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Old 03-10-2015, 07:40 PM   #20
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Default Re: OEM Thermostat Housing

If you try and stuff a STANT or any other OEM design thermostat into a non standard housing it will not fit. The STANT comes with directions and as long as you have the correct OEM housing it fits.

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