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Thread: Thermostat housing

  1. #1
    Join Date
    Apr 2011
    Location
    Portland, Oregon
    Posts
    257

    Thermostat housing

    This doesn't look right but is there suppose to be a dip in the bottom of the thermostat housing? Almost looks gouged or something. Redid my water pump and tstat, and no matter what I've tried it leaks from the bottom bad. I suspect this is the cause? Firs time doing this on the car since I bought it

    I have a spare one luckily
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    03hyundai elantra-everyday car. 275k gave out. Spare motor has 345k on it and strong. Getting body work and new paint job
    89sc auto- locating spare motor
    90sc auto

  2. #2
    Join Date
    Apr 2011
    Location
    Portland, Oregon
    Posts
    257
    I might of solved it. I didn't know there was a thermostat gasket itself with the water outlet gasket. Well that could be the problem. Oops

    03hyundai elantra-everyday car. 275k gave out. Spare motor has 345k on it and strong. Getting body work and new paint job
    89sc auto- locating spare motor
    90sc auto

  3. #3
    Join Date
    Dec 2007
    Location
    Salem OR
    Posts
    6,804
    I've seen that dip on all of mine, yes. Assumed purpose is related to locking/indexing stats (process outlined in the factory manual...insert and twist clockwise to lock). I can new find stats w/bleed holes but haven't seen locking stats in the aftermarket, so...

    These housings leak easily, usually due to a warped base. I clean them thoroughly, then patiently wet sand the flange on a full sheet of fine grit on a glass tile. Be sure the flange is flat and smooth, including the edges of the bolt holes. Set it on the glass and check it with a feeler gauge.

    Installation involves a thin even coat of black or red (coolant safe) RTV both sides of a new gasket (I use Fel-Pro*), left to dry overnite...now is a good time to re-paint the housing and clean up the bolts & mounting surface on the intake manifold.

    Next day I apply a thin coat of spray adhesive to one side (which will go against the housing), confirm the stat is pointed correctly against the flow (spring towards the engine/manifold), bleed hole up at 12 o'clock if applicable, staying in place on it's own, using a bit of hot glue if needed, then attach the gasket, spray adhesive side to the housing, then position the housing on the also-cleaned-and-flat port on the intake manifold and bolt down....shop manual says 15 ~ 22 ft. lbs. Too much will just warp it again, so resist any temptation to go nuts, but don't wimp out, either. Remember the housing is steel but the manifold is aluminum.

    This is all left to sit another overnite, -before- adding coolant and wrapping things up. Sounds like a pain, but again, these housings luv to leak and can apparently smell fear, so don't be shy about showing yours who's the boss.

    Good luck w/it.

    *https://www.autozone.com/cooling-hea...25119_199430_0

    Ken

  4. #4
    Join Date
    Apr 2011
    Location
    Portland, Oregon
    Posts
    257
    Thanks Ken!
    Luckily I do body work on cars so I have access to all the tools to make it right. Cleaned sanded and lined it up good, in the morning I'll be doing the coolant and bleed the air out hopefully I have no more issues for a long time. This car better realize who's boss quickly!

    03hyundai elantra-everyday car. 275k gave out. Spare motor has 345k on it and strong. Getting body work and new paint job
    89sc auto- locating spare motor
    90sc auto

  5. #5
    Join Date
    Apr 2011
    Location
    Portland, Oregon
    Posts
    257
    Jesus son of a b****! I had to take it apart 1 more time cause I didn't think I had the springs facing the engine side. Good thing I did cause I had it backwards! Back together and tomorrow a refill and drive.

    03hyundai elantra-everyday car. 275k gave out. Spare motor has 345k on it and strong. Getting body work and new paint job
    89sc auto- locating spare motor
    90sc auto

  6. #6
    Join Date
    Apr 2011
    Location
    Portland, Oregon
    Posts
    257

    Wink

    Whoever coined the phrase 3rd times a charm obviously didn't think about these tstat housings. Finally got it done without leaking and there was a difference between the spare housing I had and the one on the car. I'm thinking that was why it kept leaking, cause I did the exact same process twice only changing the housing and it doesn't leak this time. Hopefully you can see in the pics, but I think the previous owner maybe pryed on the housing?
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    03hyundai elantra-everyday car. 275k gave out. Spare motor has 345k on it and strong. Getting body work and new paint job
    89sc auto- locating spare motor
    90sc auto

  7. #7
    Join Date
    Mar 2017
    Location
    Sweden
    Posts
    51
    Ouch, the one on the right doesn't look too good in comparison.
    Also the flats having been rotated 90 degrees for some reason.

  8. #8
    Join Date
    Apr 2011
    Location
    Portland, Oregon
    Posts
    257
    Right It doesn't look good. Not sure what the previous owner did to it but it leaked no matter how good I sealed it. I should of checked it the first time

    03hyundai elantra-everyday car. 275k gave out. Spare motor has 345k on it and strong. Getting body work and new paint job
    89sc auto- locating spare motor
    90sc auto

  9. #9
    Join Date
    Apr 2002
    Location
    St. Charles, MO
    Posts
    21,001
    Got tired of mine leaking and bought a reinforced one.


    David
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  10. #10
    Join Date
    Apr 2011
    Location
    Portland, Oregon
    Posts
    257
    If mine leaks again I'll be getting one of those. Seen good feedback on them

    03hyundai elantra-everyday car. 275k gave out. Spare motor has 345k on it and strong. Getting body work and new paint job
    89sc auto- locating spare motor
    90sc auto

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