99 STS Running Hot - Page 2
Cadillac
 

Cadillac Forums | Help Us Help You | Advertise | Cadillac Parts | Cadillac News | Cadillac Classifieds / (Old System)

Cadillac Technical Archive | Cadillac Dealers | Cadillac Reviews | Cadillac Dealer Reviews | Cadillac Vendors

CadillacForums.com is the premier Cadillac Forum on the internet. Registered Users do not see the above ads.
+ Reply to Thread
Page 2 of 9 FirstFirst 1 2 3 4 5 6 7 8 9 LastLast
Results 16 to 30 of 134
Like Tree8Likes
Cadillac Seville / Cadillac Eldorado Forum Discussion, 99 STS Running Hot in Past Cadillac Vehicle Discussion; Give'r hell. I'm with Ranger - all symptoms displayed together is a textbook checklist to headgasket problems on ANY engine. ...
  1. #16
    drewsdeville is offline Cadillac Owners Master
    Automobile(s): 2011 Crown Vic LX
    Join Date
    Oct 2004
    Location
    Oak Creek, WI
    Posts
    5,310

    Re: 99 STS Running Hot

    Give'r hell.

    I'm with Ranger - all symptoms displayed together is a textbook checklist to headgasket problems on ANY engine. Adding coolant, random overheat, gurgling sounds, no heat when overheating, etc. Doesn't get any better than that.

  2. #17
    maiahsdad's Avatar
    maiahsdad is offline Cadillac Owners Fanatic
    Automobile(s): 05 STS AWD 1SG
    Join Date
    Apr 2009
    Location
    Fishers, Indiana, USA
    Posts
    471

    Re: 99 STS Running Hot

    Quote Originally Posted by Mark C View Post
    Thats not a typical symptom of a headgasket issue, thats more likely an airflow issue caused by fans not running, or a slipping waterpump belt. Headgasket issues mostly show up when the engine is heavily loaded, like when driving up a long hill, or when under heavy acceleration.
    My car does the opposite. When I accelerate heavily, it cools down. The higher the RPMs (even sitting still), the more I can cool it down. When I'm at the stoplight, if it starts to get hot (past the 1 O'clock position), I put it in neutral and idle the engine up to about 2500, and it cools it down. But the minute I take my foot off the accelerator, it begins to creep back up, and will eventually go into red if I allow it.

    ----------

    If I can't afford a headgasket repair, what suggestions do you have for a fix to get me through? It's my only transportation and I have NO extra money for car rental or purchase. And I still owe $4500 on this car.

  3. #18
    ternstes is offline Cadillac Owners Fanatic
    Automobile(s): 2011 CTS V, 2007 SRX V8, 2005 CTS 3.6L, 2000 STS, 1999 STS
    Join Date
    Nov 2008
    Location
    SW Ohio
    Age
    33
    Posts
    399
    Maybe your water pump belt is slipping or the tensioner is bad introducing slack in the belt.

  4. #19
    mike5514 is offline Cadillac Owners Enthusiast
    Automobile(s): 97sls,06dts
    Join Date
    Jun 2004
    Age
    76
    Posts
    865

    Re: 99 STS Running Hot

    The cheapest thing you can do and the most bang for the buck is what I posted in #9. Focus on completing these three test If you don't the cost could turn ghastly don't throw parts at these northstars with out these test you are wandering in a wasteland surrounded by people that will gladly take your last dollar.Mike

  5. #20
    Mark C's Avatar
    Mark C is offline Cadillac Owners Connoisseur
    Automobile(s): 1997 Seville STS, 2000 Seville STS
    Join Date
    Jul 2007
    Age
    56
    Posts
    1,674

    Re: 99 STS Running Hot

    Do Not put any magic head gasket sealant into the coolant, they do not work on northstar engines and will just cause you problems if it turns out to not be a headgasket issue.

    Check the tension on the water pump drive belt. Its under the black metal shroud just to the right of the oil dip stick. You can remove the cover with a 10mm wrench to inspect the belt, the pulleys, and the tensioner. I had a tensioner go bad and the car would heatup at low rpms becasue the belt was slipping and the pump wasn't turning fast enough, but at higher rpms it spun fast enough to move enough water thru the radiator to keep the car cool.

    Did you go back and look at the fans? There should be 2 fans behind the radiator (engine side), none on the front of the radiator (grille side). If someone added and auxiliary fan at least make sure its blowing the air thru the radiator and not sucking it out (working backwards). I'd probably get rid of it because its blocking air flow thru the radiator if its not running, and if its running the wrong way it definately is affecting the air flow thru the radiator. Also put the HVAC in FRONT DEFROST and make sure both fans behind the radiator are running. You can't even begin to cool a car if you don't have proper air flow thru the radiator. Also make sure the upper panel that runs across the top of the radiator is in place, and the lower closure panel between the front bumper and the front subframe is there. These panels force air to go thru the radiator instead of around it when the car is in motion.

  6. #21
    maiahsdad's Avatar
    maiahsdad is offline Cadillac Owners Fanatic
    Automobile(s): 05 STS AWD 1SG
    Join Date
    Apr 2009
    Location
    Fishers, Indiana, USA
    Posts
    471
    Quote Originally Posted by Mark C
    Do Not put any magic head gasket sealant into the coolant, they do not work on northstar engines and will just cause you problems if it turns out to not be a headgasket issue.

    Check the tension on the water pump drive belt. Its under the black metal shroud just to the right of the oil dip stick. You can remove the cover with a 10mm wrench to inspect the belt, the pulleys, and the tensioner. I had a tensioner go bad and the car would heatup at low rpms becasue the belt was slipping and the pump wasn't turning fast enough, but at higher rpms it spun fast enough to move enough water thru the radiator to keep the car cool.

    Did you go back and look at the fans? There should be 2 fans behind the radiator (engine side), none on the front of the radiator (grille side). If someone added and auxiliary fan at least make sure its blowing the air thru the radiator and not sucking it out (working backwards). I'd probably get rid of it because its blocking air flow thru the radiator if its not running, and if its running the wrong way it definately is affecting the air flow thru the radiator. Also put the HVAC in FRONT DEFROST and make sure both fans behind the radiator are running. You can't even begin to cool a car if you don't have proper air flow thru the radiator. Also make sure the upper panel that runs across the top of the radiator is in place, and the lower closure panel between the front bumper and the front subframe is there. These panels force air to go thru the radiator instead of around it when the car is in motion.
    I posted a video on YouTube of what I was looking at. I took the surge tank hose off and started the car. No fluid came out. Also, as I followed that hose, it didn't lead to a hollow nut seemingly. The You Tube video should be ready to view soon.

    After I replaced the hose, now the heating problem is worse! Within 3 miles and before the heat started warning the inside, the car has run hot. I am now sitting on the side of the road waiting for it to cool down. I've had to pull over 3 times in the last 3 miles.

    I am wondering if my removal and replacement of the small hose has changes something. And raising the RPMs don't help now.

    I'm stranded with towing estimated in 5 hours. It's 26 degrees here.

  7. #22
    drewsdeville is offline Cadillac Owners Master
    Automobile(s): 2011 Crown Vic LX
    Join Date
    Oct 2004
    Location
    Oak Creek, WI
    Posts
    5,310

    Re: 99 STS Running Hot

    Block test.

  8. #23
    Ranger's Avatar
    Ranger is offline Cadillac Owners Member
    Automobile(s): White Diamond '03 DHS (with DTS floor shift)
    Join Date
    Jun 2004
    Location
    Woodstock Ill.
    Age
    66
    Posts
    73,288

    Re: 99 STS Running Hot

    Removing the purge line didn't change anything (assuming of coarse that you reinstalled it). You probably got no coolant out of it because there is no coolant in the water pump housing, just exhaust gases and that does not cool the engine. This is a '99 and they seem to be the worst for failed HG's. You need to GET A BLOCK TEST KIT. Borrow it from Autozone. It's free. Just pay for the test fluid and run the test to confirm that the HG's have failed.

  9. #24
    Submariner409's Avatar
    Submariner409 is offline If it won't run, chrome it
    Automobile(s): 2002.5 F55 STS/65500mi, 2004 Ford F150 SuperCab4x4
    Join Date
    Feb 2006
    Location
    MD Eastern Shore - Kent Island
    Age
    74
    Posts
    44,529

    Re: 99 STS Running Hot

    Problem is, he's stuck by the side of the road with a hot engine...................

    Can you get some water - from anywhere - and limp to town or home ?? Even drive the car for a mile or so in spurts - in cold weather you should be able to get a fair distance with all accessories off and in "camel mode". You won't hurt the engine if you're careful.

  10. #25
    Ranger's Avatar
    Ranger is offline Cadillac Owners Member
    Automobile(s): White Diamond '03 DHS (with DTS floor shift)
    Join Date
    Jun 2004
    Location
    Woodstock Ill.
    Age
    66
    Posts
    73,288

    Re: 99 STS Running Hot

    I know, but he wasn't when this thread started.

  11. #26
    maiahsdad's Avatar
    maiahsdad is offline Cadillac Owners Fanatic
    Automobile(s): 05 STS AWD 1SG
    Join Date
    Apr 2009
    Location
    Fishers, Indiana, USA
    Posts
    471
    Quote Originally Posted by Ranger
    I know, but he wasn't when this thread started.
    The block test was negative when this thread started as well.

  12. #27
    Ranger's Avatar
    Ranger is offline Cadillac Owners Member
    Automobile(s): White Diamond '03 DHS (with DTS floor shift)
    Join Date
    Jun 2004
    Location
    Woodstock Ill.
    Age
    66
    Posts
    73,288

    Re: 99 STS Running Hot

    I don't recall reading that. I'd do it again after an overheat episode. Your symptoms do not sound good.

  13. #28
    maiahsdad's Avatar
    maiahsdad is offline Cadillac Owners Fanatic
    Automobile(s): 05 STS AWD 1SG
    Join Date
    Apr 2009
    Location
    Fishers, Indiana, USA
    Posts
    471
    Quote Originally Posted by submariner409
    Problem is, he's stuck by the side of the road with a hot engine...................

    Can you get some water - from anywhere - and limp to town or home ?? Even drive the car for a mile or so in spurts - in cold weather you should be able to get a fair distance with all accessories off and in "camel mode". You won't hurt the engine if you're careful.
    Thanks for the thoughtfulness Sub. I waited for the roadside assistance dude.

    Since both I and the autozone cat are clueless about this, anyone with pointers on how to administer the test?

  14. #29
    Mark C's Avatar
    Mark C is offline Cadillac Owners Connoisseur
    Automobile(s): 1997 Seville STS, 2000 Seville STS
    Join Date
    Jul 2007
    Age
    56
    Posts
    1,674

    Re: 99 STS Running Hot

    Quote Originally Posted by maiahsdad View Post
    I posted a video on YouTube of what I was looking at. I took the surge tank hose off and started the car. No fluid came out. Also, as I followed that hose, it didn't lead to a hollow nut seemingly. The You Tube video should be ready to view soon.
    Wheres the link?

    The only reason no water would come out of the purge line is if it was totally plugged, the water pump is completely air bound (caused by the first reason) or the water pump is not turning, either from the drive belt missing, or slipping really badly, of the pump itself has failed mechanically. When you pulled that line off, it would have vented any air out of the tube, and it should have started at least spitting air out. You have a better than even chance that the line is plugged. Find out which it is before driving the car further.

    I don't have any issues with my coloant system and i always have a gallon of 50/50 coolant and a couple of quarts of oil in the trunk, just in case.

  15. #30
    maiahsdad's Avatar
    maiahsdad is offline Cadillac Owners Fanatic
    Automobile(s): 05 STS AWD 1SG
    Join Date
    Apr 2009
    Location
    Fishers, Indiana, USA
    Posts
    471
    Quote Originally Posted by Mark C

    Wheres the link?

    The only reason no water would come out of the purge line is if it was totally plugged, the water pump is completely air bound (caused by the first reason) or the water pump is not turning, either from the drive belt missing, or slipping really badly, of the pump itself has failed mechanically. When you pulled that line off, it would have vented any air out of the tube, and it should have started at least spitting air out. You have a better than even chance that the line is plugged. Find out which it is before driving the car further.

    I don't have any issues with my coloant system and i always have a gallon of 50/50 coolant and a couple of quarts of oil in the trunk, just in case.
    Here's the link:

    http://www.youtube.com/watch?v=zuQ08...e_gdata_player

Quick Reply Quick Reply

Register Now

Please enter the name by which you would like to log-in and be known on this site.
If you do not want to register, fill this field only and the name will be used as user name for your post.

Please enter a password for your user account. Note that passwords are case-sensitive.

Please enter a valid email address for yourself.

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.



Bookmarks

Cadillac Posting Rules

  • You may post new threads
  • You may post replies
  • You may not post attachments
  • You may not edit your posts
Read about Lincoln | Buick | Kia Forte Forum
Need products for your Cadillac? Check out your options at the links below:

custom floor mats | Cadillac Chrome and Black Chrome Wheels | window tinting