Where are the drain plugs on a Cadillac DeVille?

Where are the drain plugs on a Cadillac DeVille?

There are no block drain fittings. The best you can do is remove the bottom trim panel and them remove the drain plug from LH side radiator end panel. A 3/4″ socket will fit on the radiator drain plug. To get even close to a 100% coolant change will require draining the radiator 2 or 3 or more times.

What kind of coolant does a Cadillac DeVille use?

I am also putting Kool-It additive in as well as the GM coolant Supplement (12378255)that we started using at Cadillac back in the mid-80’s (a real lifesaver). My Cadillac factory manual states that there are block drains on the early Northstars, but I have never found one on the later models.

What should I put in my coolant block drain plugs?

As an added precaution, as I stated before, I add the GM coolant supplement, made by Barsleaks for GM, #12378255. This additive has been put in virtually every new car for at least 20 years. Not only is it a stopleak, but it contains rust inhibitors and soluble oil. I also add Kool-it to the mix.

There are no block drain fittings. The best you can do is remove the bottom trim panel and them remove the drain plug from LH side radiator end panel. A 3/4″ socket will fit on the radiator drain plug. To get even close to a 100% coolant change will require draining the radiator 2 or 3 or more times.

I am also putting Kool-It additive in as well as the GM coolant Supplement (12378255)that we started using at Cadillac back in the mid-80’s (a real lifesaver). My Cadillac factory manual states that there are block drains on the early Northstars, but I have never found one on the later models.

As an added precaution, as I stated before, I add the GM coolant supplement, made by Barsleaks for GM, #12378255. This additive has been put in virtually every new car for at least 20 years. Not only is it a stopleak, but it contains rust inhibitors and soluble oil. I also add Kool-it to the mix.