Driving me crazy!

[mikebee]

Hey guys my 1996 Eldo touring coupe is driving me crazy. After driving it for over 40 minutes tha anitfreeze is forced out of my overwflow tube. I have taken it two 2 different shops and neither one can figure out what is going on. Other than the overflow thing the car rides perfect. Even when I drive it to work 30 miles away no problem. But as soon as I drive in stop and go trafffic, the temperature steadily rises from the halfway mark all the way to red, when I pull over sure enough the anitifreeze is pouring out of the overflow tube! Any suggestions would be greatly aprreciated.

[CadillacSTS2003]

head gaskets

[Raze]

neither shop tested your pressure cap on the surge tank? The spring can go bad over time and not hold the required pressure. Did they pressurize the coolant system to see if there's a blockage somewhere? Are you puffing white smoke out the tailpipe? I'm thinking blockage not a HG yet...

[dwight.j.carter]

I ended up replacing the cap on the reserve tank the spring quit working and the valve was stuck closed. The cap is only 13 bucks. Have a pressure test though just to be safe.

[z06bigbird]

Good luck.

Ed

[mikebee]

K thanks guys I will buy a new cap, hopefully thats it!

[NickySantoro]

Originally Posted by mikebee

. But as soon as I drive in stop and go trafffic

Are the cooling fans coming on at all when idling?

[Loos Cannon]

i had the same problem, and still have it. I replaced the cap...didnt do it. I drained the system and put fresh antifreeze..that worked for a couple weeks and now im back to the same deal. After stop and go driving it overflows..and yes my coolant fans come on after idling for a while

[mikebee]

yes the cooling fans do come on.

[1997BlackETC]

could be a clogged radiator too, maybe you should take it to a radiator shop and have it flow tested.

[Playdrv4me]

Originally Posted by CadillacETC1997

head gaskets

For his sake I hope not, but it sure sounds like it to me.

We'll keep our fingers crossed for ya.

[mikebee]

Well the latest is I bought a new cap, car drove fine for 2 days now back to same thing. What about the anitfreeze I buy that green 50/50 mix from autozone is that ok or do i need dexcool?

[1997seville]

Your car came with Dexcool from the factory and should always be replaced with Dexcool.

[chubbyranger]

How about a stuck thermostat? If your coolant flow is restricted, the airflow through the radiator and engine compartment at highway speeds could compensate. When you get into traffic there may be too much heat buildup before the fans kick on, so the system overflows. If you're going to change the coolant out anyway it shouldn't be much more of a job to do a t-stat. Just a guess, but a much cheaper guess than HGs.

[mikebee]

Well here's the latest, I changed the thermostat and put in the dexcool anitfreeze with the correct bars stop leak. The car drove perfect for one day then i noticed a small leak coming from the hose on the passenger side out of the radiator, the one with the metal bushing on it, someone told me that is my trans line and if it was leaking right at that metal bushing then that meant that my radiator was no good. They told me to drive the car and the bars stop leak might eventually seal it up. Now when i drive the car i don't notice any leaks until after the car has been sitting for more than 3 or 4 hours. If i check to see if any leaks an hour after driving there are none but later on i see what appears to be anti freeze on the ground. Mind you my original problem was the car overheating because of anti freeze pouring out of my overflow hose. The car has not overheated nor is anitreeeze coming out of my overflow hose ever since I changed that thermostat and added anti freeze, so maybe it is the radiator. Thanks for all of the help!