where is thermostat
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Northstar Engines and System Technical Discussion Discussion, where is thermostat in Cadillac Engine Technical Discussion; My 02 deville keeps overheating and blowing weak heat can anybody help...
  1. #1
    ecoleman is offline Cadillac Owners Member
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    overheating and no heat

    My 02 deville keeps overheating and blowing weak heat can anybody help

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  3. #2
    ecoleman is offline Cadillac Owners Member
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    where is thermostat

    Can't find tstat on 02 deville please help

  4. #3
    Submariner409's Avatar
    Submariner409 is offline If it won't run, chrome it
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    Re: where is thermostat

    It's in the thermostat housing at the water pump drive on the driver's end (the rear end) of the engine.

    Click my username, open the profile. Left column - 2 albums, 6 pages of stuff for your engine - MANY of the water pump and cooling system.

    If you didn't know where it was, why do you need to do something ??? You may be getting over your head: This is like no cooling system you may have worked with before.

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    Submariner409's Avatar
    Submariner409 is offline If it won't run, chrome it
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    Re: overheating and no heat

    Wrong forum - none of these engines are yours - you have a VIN Y 4.6 Northstar DOHC engine.

    Moved from 4.1, 4.9, etc.

    See my previous post - you need to do a bit of homework before you start messing with thermostats. (and they're very reliable in this group of engines.................. Northstar.)

    What's "overheating", and define "weak heat".

  6. #5
    Ranger's Avatar
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    Re: where is thermostat



    Thermostats are pretty damned reliable. Can you give us more specific symptoms?

  7. #6
    ecoleman is offline Cadillac Owners Member
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    It's overheating and not blowing heat full of coolant had,head gaskets fixed now overheating and blowing cold air

  8. #7
    vincentm's Avatar
    vincentm is offline Cadillac Owners Connoisseur
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    What was the head gasket repair method? Studs? Timserts? Helicoils? NormSerts? Arp studs?

    Has a blocktest been done. Help us help you man

  9. #8
    ecoleman is offline Cadillac Owners Member
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    I bought the head gasket kit for 250 so everything got changed water pump not leaking water check for clogs and didn't see none so I'm thinking its tstat just from temp going up and no heat

  10. #9
    vincentm's Avatar
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    What "head gasket kit" you do realize the block itself needs to be re-tapped and fitted for more courser threads via stutds or large serts?

  11. #10
    needstires is offline Cadillac Owners Member
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    Quote Originally Posted by ecoleman
    My 02 deville keeps overheating and blowing weak heat can anybody help
    You have 1 of 2 problems eather it's low on coolant or its the head gaskets going bad I've seen this 100 time or more time in my shop I had for over 37 years and its not just caddies its anything with coolant and head gaskets in it . There not completely blown yet but the end is coming soon what happens is its blowing compression into the cooling system and it is aerating the system . A good way to test it is when it's cold put a pressure gauge on the radiator ,
    .where the cap goes start it up if it starts building pressure in a couple of minutes that a good sign . If you don't have a gauge you can feel the upper hose if it gets hard before it gets warm that's also a sign ... Does it have hi mileage? Any more question please feel free to ask .

  12. #11
    RippyPartsDept's Avatar
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    Re: where is thermostat

    the purge line could be clogged ... that will present a situation where there is no coolant loss and correct coolant level but you get overheating
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  13. #12
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    Re: where is thermostat



    Check that purge line first. If that's OK, do a block test.

  14. #13
    ecoleman is offline Cadillac Owners Member
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    Changed thermostat not hard to do at all some guy on here acted like it was changing motor Lmao purge line ???? Where is that???

  15. #14
    Ranger's Avatar
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    Re: where is thermostat

    The purge line is the 3/8" line that runs from the W/P housing aka crossover manifold to the surge tank.

    This is Sub's Seville. Yours should be on the passengers side, but will look the same.


  16. #15
    ecoleman is offline Cadillac Owners Member
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    Thanks for pic wat about bleed the line for air

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