: 1998 STS coolant change



jt_smithjr
05-19-14, 11:44 AM
I am new to this site and I can already see that this is going to be my go-to-place. I have just bought a 1998 Cadillac Seville STS 102,000 miles and, I want to change the coolant 50/50 Dex Cool. MY QUESTION IS... "WHERE CAN I FIND THE DRAIN PLUG FOR THE RAIDATOR?"

arctic_man
05-19-14, 12:16 PM
I am new to this site and I can already see that this is going to be my go-to-place. I have just bought a 1998 Cadillac Seville STS 102,000 miles and, I want to change the coolant 50/50 Dex Cool. MY QUESTION IS... "WHERE CAN I FIND THE DRAIN PLUG FOR THE RAIDATOR?"

You will probably find more answers if you start your own thread. But the drain plug is drivers side, very bottom of the radiator. Under the radiator hose and next to the trans cooler line. You may be able to reach it from the bottom of the car, but if you are draining it all anyway, you could probably remove the bottom rad hose. It should then be easy to get to.

MoistCabbage
05-19-14, 12:23 PM
:welcome:

The lower hose is fairly high up on the radiator, just use the drain plug. You'll have to remove the plastic air deflector under the car between the bumper and cradle.

No need for a flush, refill with a 50/50 mixture of coolant and distilled water. DEX-COOL or universal, it makes no difference. Do not add any stop leak products or coolant tabs.

See you around in the Eldo/Seville section.

Submariner409
05-19-14, 12:48 PM
Posts moved to OP's own thread. No need to resurrect a 10 year old dead thread.

Much info in the sticky posts just above, way up ^^^ top in the Cadillac Technical Archive, and in Discussions, Item Specific: Cadillac Tech Tips.

Cadillac stopped adding the tablets/powder in 2003.

Ranger
05-19-14, 02:59 PM
#10 Accessing it will be much easier if you drop the lower air deflector and go in from beneath.


http://www.gmpartsgiant.com/Page_Product/PartDetail.aspx?Make=Cadillac&Model=Seville&Year=1998&MakeCode=K&ModelCode=K&CatalogCode=66O&eCode=L37&tCode=MH1&mCode=6KY69&majorIndexID=01&minorIndexID=6K01-036&ART_SUFFIX=1&SortKey=4
http://genmotorinfo.com/images/01/9805016K01-036.png