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41K views 59 replies 15 participants last post by  Paul London 
#1 ·
I bought a 99 seville in Jan. with 108,000 miles. I drove to Kansas City, MO from Wisconsin two days after I bought it (moved). The car drove fine. The first weekend I drove downtown the car overheated. I found some threads online that say it is the head gasket. I brought the car to a cadillac dealership and they said "yes it is the head gasket". I brought the car to another place and they ran a test (mixed some liquid with the coolant and did not see a color change) and found not to be a head gasket. This mechanic stated there is nothing wrong with the head gasket and replaced the fan sensore and sent me on my way. One week later I drove downtown and the temp has from the middle about an 1/8 inch (about 3/4 of the gauge). After it raised it went back down after about a minute. When I pull off from a stop light I can hear air bubbles. I need help and hoping this is an easy fix before I drive it back to WI to the dealership to get fixed.

Any help PLEASE!!!!
 
#2 ·
Re: 1999 Cadillac Seville OVERHEATING :(

There is an air purge line that begins at a hollow bolt above the water pump cover and flows through the throttle body and terminates at the top of the coolant reservoir. Be 100% certain that line is flowing a slow steady trickle of coolant by removing the rubber hose from the top of the reservoir with the engine at idle (cold engine!!).

If there is no coolant flow, locate and remove the blockage.

Once the air is purged from the system, you can expect the coolant level in the reservoir to drop a little so keep an eye on the level. Once again, with a cold engine.
 
#4 ·
Re: 1999 Cadillac Seville OVERHEATING :(

Has to be in the heater core....they can be a PITA to purge of all air bubbles. Try a few judicious high rpm moderate accelerations in gear position 2. Let the engine run up to the 1 - 2 shift with moderate throttle and then ease it up to over 5000 rpm and let it coast back down. Watch the temp gauge (it probably won't move) and do it again. Let the car cool, and maintain the coolant level at about halfway up the tank, cool.
 
#5 · (Edited)
Re: 1999 Cadillac Seville OVERHEATING :(

It will make the bubbling sound even when in park and i raise the RPM's, I can start to hear it at about 2000 RPM's. Do you think the heater core needs to be replaced or is there a way to bleed the system (if brought into a mechanic). I need to try and figure out if it is worth driving back to WI (still under warranty) from Kansas City, MO or pay to get fixed here.
 
#6 ·
Re: 1999 Cadillac Seville OVERHEATING :(

If you still have warranty I would take it back imo.
 
G
#7 ·
Re: 1999 Cadillac Seville OVERHEATING :(

yeah, change the water pump, check the purge line, change the t stat and do all of what everyone is telling you to do. After you get done wasting all that time and money................it'll be the head gaskets. I'm rarely wrong on this. ;)
 
#9 ·
Re: 1999 Cadillac Seville OVERHEATING :(

Maybe they did the test wrong. You can't do it after you add fresh coolant or it will give a false negative. From what you are saying I doubt you'll make it to Wisc. Your symptoms do not sound promising I hate to say.
 
#12 ·
Re: 1999 Cadillac Seville OVERHEATING :(

I read it upside down and backwords. Have been dealing with them since the end of Jan. The only way they will fix it is if I bring it up there or they will send me a check for $2500 to get it fixed here but the cheapest I have found is $3500 after taxs.
 
#17 ·
Re: 1999 Cadillac Seville OVERHEATING :(

If it is the hg, would it overheat all the time? I tried to get it to overheat last night by driving around for about an hour (fast, stop and go, everything) and I only got the temp to raise about and 1/8 inch and then it went back down after about a minute but the gurgling water sound seems to be getting louder/worse.
 
#19 · (Edited)
Re: 1999 Cadillac Seville OVERHEATING :(

I have not had the car overheat under a load yet. Everytime has been in stop and go traffic or at stop lights. I drove from Kansas City tothe middle of Iowa about a month ago and I did not have any problems. The temp was chilly on the way there but 50's on the way back. I also drive the car to work and back and anywhere I need to go without it overheating (unless I get in stop and go traffic). Whats is the gurgling noise that I hear? Can the be part of the problem?
 
#23 ·
Re: 1999 Cadillac Seville OVERHEATING :(

210 - 225 degrees is what it raised to then goes back down. When it raises it takes about 4 seconds to get that high, then after a minute or so (depends everytime) it goes back down. It completley overheated once where I had to pull over. I hooked it up to a computer and did not get anything back.

Should I be worried about the gurgling?
Thanks for all the help!
 
#25 ·
Re: 1999 Cadillac Seville OVERHEATING :(

If you don't have the A/C on or heater in Defrost mode the fans don't come on until the temperature gets to 225, and then only one starts. Two fans run in fast mode at 238 degrees. Did the car overheat (steam out of the surge tank) or did the DIC tell you to idle engine or stop the engine?
 
#26 ·
Re: 1999 Cadillac Seville OVERHEATING :(

I popped the hood and there was steam and also coolant boiled out of the cap. I let it cool and made it to a gas station and added more coolant. I then made it all the way home (about 15 minutes) without the temp gauge raising. I have had the fan sensor replaced and now it raises to about the 225 mark if I am driving downtown otherwise it is fine.
 
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