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Thread: Replacing your van's thermostat

  1. #41
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    Re: Replacing your van's thermostat

    Behind the alternator, tucked in by the engine mount.

  2. #42
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    Re: Replacing your van's thermostat

    I used the search feature and found this:

    https://www.toyotavantech.com/forum/...Reservoir-Leak

  3. #43
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    Re: Replacing your van's thermostat

    Quote Originally Posted by timsrv View Post
    I used the search feature and found this:

    https://www.toyotavantech.com/forum/...Reservoir-Leak
    Thank you both - I went through a ton of threads and missed that photo.

  4. #44
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    Re: Replacing your van's thermostat

    No problem. I had an advantage since I posted it (I knew it was there)......I could also remember some key words (like "brass" and "extension"). Those two coupled with "block drain" narrowed it down to just 2 threads . Tim

  5. #45
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    Re: Replacing your van's thermostat

    Lots of great info here... I just wish I'd read it all first.

    A month or so back, when making preparations to do a complete coolant line refresh, I went to RockAuto.com and punched in my search for the appropriate thermostat and gaskets. (1988 4WD Manual)
    Of course, NOW I'm reading all of this about the OEM parts and regret my purchase.
    Now I'm ready to replace the old TStat and upon opening the box and inspecting the new one, I find it doesn't have a jiggle Valve at all.

    So.. do I take a chance? Or do I order it all again from Toyota?
    here's the link to the particular TStat I ordered. https://www.rockauto.com/en/moreinfo...279818&jsn=388

    Opinions?
    Anyone installed an aftermarket TStat manufactured without a jiggle valve to any success??

    I know the original article (( https://www.toyotavantech.com/forum/...n-s-thermostat )) was from 9 years ago and wondered if anything would have changed since then.

  6. #46
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    Re: Replacing your van's thermostat

    IMO i'd only use OEM since it's still available and cheap and it's specifically built to get your vans cooling system running right. but since you already bought one you can try it and see how it runs. the install is a PITA but only takes an hour or two max - so you can always swap out later if the temp isn't running within the optimal zone. other consideration is if you want to risk your van running too hot or how far from civilization you typically drive. on second thought after typing all this out - i'd just buy the proper thermostat and be done with it

  7. #47
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    Re: Replacing your van's thermostat

    Just. Buy. OEM.

    If you can't afford to eat the cost of that aftermarket t-stat and wait a for the proper OEM one to arrive, you're really really really not going to be able to handle the cost of a head job plus how long that puts your van out of commission.

    Gwen
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  8. #48
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    Re: Replacing your van's thermostat

    Quote Originally Posted by llamavan View Post
    Just. Buy. OEM.

    If you can't afford to eat the cost of that aftermarket t-stat and wait a for the proper OEM one to arrive, you're really really really not going to be able to handle the cost of a head job plus how long that puts your van out of commission.

    Gwen
    Totally agree Gwen.
    Small price to pay to put Crusty back on the stands. After just replacing all the coolant lines, water pump and coupling, valve cover and such. Iíll happily get the OEM TStat to finish it up proper rather than take a chance.
    Thanks for the guidance and patience. Itís much appreciated.
    A

  9. #49
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    Re: Replacing your van's thermostat

    The diagnostic proved true. (Upon cranking the van- coolant was immediately circulating) So it seems the TStat was stuck open. Thatís exactly what I found when I pulled out the old one.

    The only bad thing is the lower right stud on the TStat housing unscrewed from the block and came out with the nut when removing it.
    I didnít drain the block, so thereís still some coolant inside dampening the threaded stud receiver. Because of not being able to clean out the coolant where the stud gets screwed back in, I didnít bother putting threadlock back on the stud. Instead I just screwed it back in to hold the housing and TStat in place overnight.
    Now Iím not exactly sure what to do to lock in that stud when I finish up tomorrow.

  10. #50
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    Re: Replacing your van's thermostat

    At this point I wouldn't worry about that stud.

    Nuts often weld themselves onto studs. the proper way to deal with it is to separate the 2 when they are out and reinstall the stud, then secure it with the nut.
    Installing studs is usually done with a double nut and thread locker isn't usually required.

    The way you have done it should work just fine, the only time one would have to worry is if the new gasket were significantly thinner than the old (if the stud shaft were to bottom out prior to the nut flange making contact)

    Best practices would say do it right, but as you've already "got 'er done" just make a mental note for next time.

  11. #51
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    Re: Replacing your van's thermostat

    And if I read that wrong and it isn't fully assembled yet, then extract the frozen nut, clean up threads (block and stud) and reinstall stud (double nutted) and torque to spec, then remove the double nuts and proceed as normal.

  12. #52
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    Re: Replacing your van's thermostat

    Quote Originally Posted by Burntboot View Post
    And if I read that wrong and it isn't fully assembled yet, then extract the frozen nut, clean up threads (block and stud) and reinstall stud (double nutted) and torque to spec, then remove the double nuts and proceed as normal.
    Thanks for the input- I got everything back together without any thread lock. The bolt sealed itself when torqued down and it's been running like a champ ever since. Appreciate all the help in getting this project done!

  13. #53
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    Re: Replacing your van's thermostat

    Just a little FYI. Any time I remove a nut from a bolt or stud I put a little bit of anti seize compound on the threads to help in the removal of the nut down the road. Nothing worse then a nut that gets frozen. If it gets stuck on a bolt and you break the bolt it can be replaced but break a stud SOB. Also if you wanted to use loctite to reinstall that stud just get a can of brake cleaner and spray it on the inside threads. It will clean the slime of the A/Freeze off and it dries super fast leaving a clean and dry surface for the loctite to work like it should.

  14. #54
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    Re: Replacing your van's thermostat

    FWIW, brother-in-law (professional mechanic) and I replaced my '88 2WD 5spd's thermostat several weeks ago. The next day I drove her close to 200 miles in Florida heat without any problems whatsoever. New thermostat is OEM; I always buy Toyota when it's available.

  15. #55
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    Re: Replacing your van's thermostat

    Anybody ever notice that the Tstat housing has a slight turn to it?Here is a pic of the turn.

    Service manual says nothing as to which way it goes in.

    Does it matter?

    MT
    Attached Images Attached Images   

  16. #56
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    Re: Replacing your van's thermostat

    That's so it won't interfere with the alternator adjustment bracket. If you try to install it with the alternator already installed, it will be obvious which way it needs to be. Tim

  17. #57
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    Re: Replacing your van's thermostat

    Roger that. It was on backward then. OMG, it is amazing this little 4Y ran as good as it did with wrong torque values on the head and manifold.

    Thanks, just waiting for the next shoe to drop

    MT

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