Cadillac Seville / Cadillac Eldorado Forum Discussion, Help - overheating in Past Cadillac Vehicle Discussion; I have a 97 Eldarado & when I got the car it was fine...The 1st day it started overheating I ...
I have a 97 Eldarado & when I got the car it was fine...The 1st day it started overheating I went to Jiffy lube and got everything under the hood flushed. Can somebody pleases teall me why it still over heats...I also put a brand new thermostat on there.
Actually it didnt start over heatin til I left Jiffy lube.
Headgaskets... prepare to save up some coin for a pricey repair (entire cradle has to be dropped, head bolt holes need to be re-studded, etc.). Visit the technical section of the forum for more guidance.
I'll be the second (and it's not in reference to head gaskets): You try to maintain this car on the cheap and you'll wind up in a GM dealer's anyway: Fixing the mistakes made by the Oil Doodle.
Maintaining the cooling system in the Northstar requires karma and a sense of TLC - refill it incorrectly and you have problems - guaranteed.
You need to go to Discussions, Item Specific: Cadillac Tech Tips and look for cooling system threads - the Seville and Deville systems in your year group operate exactly the same, so read ALL threads of interest. Begin your search by looking for "purge line".
FWIW, the word "flush" is a no-no in Cadillacese - for any system.
Don't let these guys scare you, it could be something else. Check the coolant level, run a pressure test on the system for any leaks and test the cap for correct psi, make sure the fans work, check the water pump belt for slipping and check the belt tension. You could also check the water pump itself. You could also check/clean the radiator fins for blockage.
If all of the above seems good, rent a block test kit from auto zone and get the test liquid from NAPA. If it turns yellow, you are probably looking at a head gasket. If it is, you can have it repaired from $1500-$3,000+ depending on where you go.
Edit: and like Sub just said, check the purge line!
There is a return water tube going to your fill bottle.. where that tube connects to the engine may be plugged. I had this problem on my 98 seville. The adapter screws out that the hose is attached to at the engine. take it out and check it, if it is plugged you may have to drill it out a little like I did because the OEM required the use of pellets and they plug up the return hose for the coolant to go to the bottle. Hope this helps out....