#Coolant leak fix cadillac deville plus#

What could be possible causes for the oil in the coolant?

What is the small and simple cooler that sits in front of my radiator?

Do I have a transmission or engine oil cooler in my driver's side radiator end tank? Always about 196 F when cruising, going up a bit when going from highway to city and going down a few degrees after WOT (has been the same for the nine years I have had the car). It is currently warm were I live, about 80 F, so the AC is running, but I have always seen the same engine temperature behavior whether it is 80 or -10 F outside. The engine operating temperature during my last 300 miles of driving (as well as the 80000 miles that I have driven before that) was normal (about 196 F when cruising, rising a bit when going from highway to city driving and falling a few degrees during WOT (I guess as a result of the increased coolant flow at the higher RPM)).

#Coolant leak fix cadillac deville plus#

I always use DexCool plus deionized water and add two GM sealant tabs after draining the system (since I only drain and refill without flushing, some of the old coolant stays, hence only two pellets and the biannual change interval). I change my coolant with two-year intervals, with the last change almost two years ago (I plan on changing it by the end of summer). This was accompanied by a numbered illustration, which denoted the end tank cooler on the side with the drain plug, which is the driver's side, as the engine oil cooler, and the end tank cooler on the other side (passenger's side) as the transmission oil cooler (consistent with the text on the same page, but in conflict with the text on page 193). The let side end tank houses the engine oil cooler.' The right side end tank houses the transmission oil cooler. Disconnect the transmission oil cooler lines In the 1997 FSM, I found the following conflicting information:Ĩ. I have not found any information on what this is, and I could not see where the lines went. In front of the radiator (and AC radiator) there was a small steel radiator comprising a steel tube that was bent twice (so as to form three parallel lines) and cooling fins (also steel) that were attached to the three parallel lines of steel tubing. I could not see where they went from there. On the driver's side, there are two connections in the side tank that have narrow steel tubes going out of them.

On the passenger's side, there are two unused connections in the side tank.

I check these things every now and then, so I have a pretty good idea of the normal state of things. The coolant system pressurizes like normal, and holds pressure like normal. All fluids smelled like they usually do. The transmission fluid was clear and red. The coolant level has not changed, and the engine oil looks normal (light brown and clear). Not very much, but just a few drops visible in the surge tank, and a some traces of it on the plastic tab/ridge that sits right under the surge tank cap. Today, with a 200-mile trip since I first noticed the strange look of the coolant, i checked it again, and it looks like there is oil in the coolant. This question is about a 1997 Cadillac DeVille with the 275 Hp version of the Northstar engine.Īs part of my regular inspection routine, I checked the coolant a few days ago, and it looked somewhat strange.