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My toyota lucida 3C diesel is operating without a thermostat, can it cause over heating problems that i am getting?

Temperature guage reads high at high speeds only, that is above 100k/h but at 80 and below it reads normal. Should i put back a thermostat and what type and size must i put?

Posted by Kudakwashe... on

  • Larry Ng
    Larry Ng Nov 24, 2022

    why not stick to the first post of 5 (or the overheating post later.)
    and comment and tell what this means
    diesel engine rebuild????????

    tell the extent of the rebuild,as nobody can guess what was done or done in real machine shop engines

    the DIY rebuild back yard head off , new rings popped in,new gasket , bolts back , job.
    some are fun to watch.

    or a real engine rebuild overhaul by pros, all milling ,boring, honing, new pistons, new or ground valves head. new core plugs, crank ground and polished and new crank bearing as he told you sized.
    new pistons the man that bored and hones tells you SIZE to get CLEANUP he did. for sure.
    new gaskets, we use FELPRO HERE, (not from feabay ever) full with with valve seals.
    new oil pump. above pan.

    your diesel rebuild did not cause overheating if the block and head were pressure checked(above)
    as all machine shops do step 1 or waste tons labor for NOTHING gained. Ask them to do it first.

    top of bock decked (milled)? no warp-age over 0.001; per foot, any surface or better.

    head milled flat and so now engine has no internal leaks at all SEE?
    engine run on (coolant) pure water will crack ,when temps drops to 30F ( just below 0c) is worst
    and wrecks the whole engine, the pressure tests prove that. (any and all)
    as does RAD leakdown test, engine in place

    That is it , we can talk all day long (or week) on rebuilds and tests using real tools.

    no year told
    no country told to find real books on this car.
    no rebuilt steps took.
    the RAD fan may not kick on until 104C, but no car fully told so no pure exact answers here possible!
    the thermostat was missing ever fix that?

  • Anonymous Nov 24, 2022

    yes for 100year folks pulled the STAT , WHEN THE RAD CLOGGED UP WITH RUST.

    instead of fixing true cause the attempt to hide it .
    or pump impeller rust to dust, or near.
    or to lazy to replace the STAT so pulled, it, they have design life of 7 years, the STAT.
    OR HAD LEAKS and failed to fix them first.


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Larry Ng

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  • Toyota Master
  • 11,339 Answers

No year car told nor miles on it. 1990 to 2019, no country told.
2.2L oil burner.

a Previa variant car. 1990 -1999 wiki said
"The Estima Emina and Estima Lucida were also available with a 2.2-liter diesel engine (3C-T and 3C-TE)" w/and ,w/o intercooler.
so you forgot to say full engine name is/was a Turbo and if is
that , does it only overheat on BOOST>?

there is no answer to that, should I questions (but yes)
many engine (means toss coin) STAT pulled cause turbulence to the pump and now the pump impeller messes up and flow decreases.
and if not the temperature runs way too cool 150f is idle.
180 to 200F is normal.(STAT in place) your auto part store will tell you.
now the list of overheat causes.

1: the cooling system is failing, (alarge list)
clogged radiator,
pump impeller blades rusted to nothing or 1/2 way.
some one forgot to burp the loop of all air. and RAD level cold is way way too low of AF , anti freeze coolant.

2: using water only and not 50% antifreeze,never just water.
3: fans dead rear oif RAD.
4: fan shroud lost. (other owners bad acts)
5: old cars with fan thermal clutch the clutch is bad.
6: fan belt slips at fan or pump. or both, (year car told)
7:old hoses (big) bad and collapsing inside. hidden.
8: side RAD overflow bottle missing or bad or hoses inside and outside missing so every day you run the engine coolant is lost to the ground,.
9: bad head gasket engine burns coolant or far worse engine cracks
10 head in engine cracked, or just warped.
I-4 engines have no valley gasket so it is not leaking V6/v8
11: and coolant lost to ground,front passenger foot wells
12: coolant lands in Oil pan ,oil looks like milk chocolate.
i'm sure missed, 5+ more points of leak failures. sure.

Posted on Nov 24, 2022

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