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AAA Cast Aluminum 12V VR6 Thermo Housing Assemblies

Please Contact Us for Ordering Info
5.00 LBS

Product Description

---- Please Note : The cast aluminum thermostat housings go in and out of stock very often.  If you need this part immediately, please contact us to determine stock levels before ordering. is now distributing these cast aluminum thermostat housing assemblies for all 12V VR6 engines found in Corrado, Eurovan, Golf/Jetta MK3 and Passat B3/B4 vehicles.  This part replaces thermostat housing P/N 021-121-117A (021121117A), adapter P/N 021-121-133D (021121133D), and thermostat cover P/N 021-112-121A(021112121A).

This cast thermostat housing assembly includes the main thermostat housing with an integrated crackpipe adapter section and a cast aluminum thermostat cover. All new mounting fasteners, O-rings, and clips are included to complete your installation.

This cast aluminum thermostat assembly will mate up with the billet crack pipes - buy them as a set and save $$ !  You can also choose to buy a new 80C or low temp 70C thermostat with thermostat O-ring.   

NOTE: VR6 housings are individually machined and cleaned of burrs and sharp metal edges from the casting process. Your flange may differ slightly from the photos shown.  We do not machine these in house.  As such, you can expect the cosmetic look and feel of the part to NOT be what you typically see from GruvenParts.  We have no control over the casting process and some of these castings will require a bit of cleaning up if you want to make them show car worthy.  They function just fine but they dont look the best.

Applications : 

Volkswagen Corrado VR6 12v
Volkswagen Eurovan T4 VR6 12v
Volkswagen Golf III VR6 12v
Volkswagen Jetta III VR6 12v
Volkswagen Passat B3 VR6 12v
Volkswagen Passat B4 VR6 12v

Product Reviews

  1. Robust quality part for a good price for an older vehicle! 5 Star Review

    Posted by on 6th Oct 2021

    VERY happy that Gruven continues to support our older VWs like my VR6 Corrado with great parts like this! My thermostat housing was replaced with a factory part only 5 years ago and it already began failing. Having the aluminum replacement that will last much longer is crucial for preserving my classic ride. Thank you for keeping us on the road!

  2. dont like plastic parts 5 Star Review

    Posted by on 11th May 2020

    Cure what ails you. This setup does just that. Did a mock up everything fits just right. Did a little sanding and the housing is ready for paint and the crack pipe looks great. Comes with everything. Though the car is still being put together I am confident this area will no longer be a concern.

    Much thanks!

  3. If you buy a different housing. You’re making a mistake. 5 Star Review

    Posted by on 10th Dec 2019

    Great quality and service. Top Shelf !

  4. Cast Alloy Thermo housing VR6 4 Star Review

    Posted by on 20th Apr 2017

    Nice product that with the Alloy water pipe, make this a one off job. Fits perfectly.Although mating flanges on cast housing were machined well, there was still a fair bit of flashing on the casting that I had to removed by hand. Not the end of the world and maybe wont bother everyone. I had mine powder coated and it looks great.
    Would recommend these parts to any serious VR6 owner.

    Thank you Paul :-)

  5. VERY HAPPY 5 Star Review

    Posted by on 9th Nov 2016

    all good! fits my 99 m3 golf gti perfectly. dont want to be doing all that work to get to the problem and then find out it doesnt fit. but this is a great oem replacement

  6. No issues with fitment. 5 Star Review

    Posted by on 6th Nov 2016

    I was hesitant on buying this because I heard a few people say it doesn't fit right on the engine block. Well, I decided to go for it anyway. Sure enough, if fit perfectly. In fact, the Samco hoses slid on much easier than the plastic ones. No leaks at all. This is one less component of the VR6 I don't have to worry about.

    -- response --

    Thanks Dennis. Can you let me who reported issues with the fitment ? I have been using this on my VR6 for several years with no issue at all. Thanks for the review !

  7. Great Replacement 5 Star Review

    Posted by on 15th Aug 2015

    High quality, great fitment with the Gruven crackpipe. Haven't put too many miles on it. But so far no leaks, and no problems!

  8. great piece for the vr6 5 Star Review

    Posted by on 1st Apr 2015

    Very happy with this. Looks great, comes in sand blasted finish which I plan on powder coating. Has all the needed hardware and gaskets neatly packaged, even o rings for the sensors. Shipped to me in timely fashion to boot. Thx gruven!

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