Thermostat Help for 99 STS
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Cadillac Seville / Cadillac Eldorado Forum Discussion, Thermostat Help for 99 STS in Past Cadillac Vehicle Discussion; How hard is it to change the thermostat? Do I need any special tools like the water pump? The mechanic ...
  1. #1
    STS_spinnin is offline Cadillac Owners Member
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    Thermostat Help for 99 STS

    How hard is it to change the thermostat? Do I need any special tools like the water pump? The mechanic is trying to charge 100 to do it. I am not a mechanic but I know the basics, I have changed the radiator, water pump, thermosts and alternator in my 86 caprice but the Nstar is intimidating...

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  3. #2
    El Dobro's Avatar
    El Dobro is offline Cadillac Owners Connoisseur
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    Re: Thermostat Help for 99 STS

    It's not hard to change at all. There's just two bolts that hold the thermostat outlet on. There's a recess where the seal, on the outer perimeter of the thermostat, has to seat. Just make sure it's bottomed out so it doesn't leak when you reattach the outlet. There's where it's a little bit of a PITA because the thermostat is spring loaded and wants to push itself back out of the hole that it seats in.

  4. #3
    scporter is offline Cadillac Owners Member
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    Re: Thermostat Help for 99 STS

    I changed my t-stat ($9) and it is VERY EASY. All I used was a 10mm socket wrench for the 2 bolts holding the inlet flange and a 5/16 nut driver to loosen the rad hose. Just make sure you use a new t-stat gasket ($3) and put it on correctly. The gasket (actually a rubber seal) has a groove on the inside and this groove is where the flat disk surface of the t-stat sets in to it. The first time I just put in the gasket, then installed the t-stat on top and bolted on the inlet hose flange and of course it did leak. I lost the $30 of coolant and the $7 rad supplement tablets (6 brown tablets that I crushed up and put into the lower rad hose) but you live and learn. Good luck.


    Scott :coolgleam

  5. #4
    STS_spinnin is offline Cadillac Owners Member
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    Thread Starter

    Re: Thermostat Help for 99 STS

    Thanks

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