Another coolant/radiator/headgasket question
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
Results 1 to 12 of 12
Northstar Engines and System Technical Discussion Discussion, Another coolant/radiator/headgasket question in Cadillac Engine Technical Discussion; So over the last couple of months I know I had a small coolant leak and I discovered the upper ...
  1. #1
    pimpdaddycaddy91's Avatar
    pimpdaddycaddy91 is offline Cadillac Owners Fanatic
    Join Date
    May 2005
    Location
    West Valley City, Utah, United
    Age
    32
    Posts
    122

    Another coolant/radiator/headgasket question

    So over the last couple of months I know I had a small coolant leak and I discovered the upper small hose on the surge tank was loose and the tank was cracked so I replaced the tank, clamps and cap and I took the opportunity to flush my radiator for preventative maintenance since I hadnt done it before. (99 ETC 110,000 miles I bought it with 82,000).

    I knew it was over due so I used a flush cleaner made by prestone and ran it for a day and a half and then put clean water in and then my problems started. Now I drive it for 10 miles or so and it starts getting hot and will eventually overheat. I found that it is leaking water from the overflow, so I replaced the thermostat and no change. ( I tested both thermos in a pot of boiling water and both worked). I used a combustion tester myself on the cap and it showed no results.

    So my question is did I screw something up with flushing? Why did this problem start just as I flushed it? What else could cause high pressure in the cooling system if there is no exaust gasses? Previously I had no problems and I drove it 50+miles a day. I'm at my wits end.

    I would just like some more ideas before taking it to a shop to have better tests done to rule out a headgasket.

  2. Remove Advertisements
    CadillacForums.com
    Advertisements
     

  3. #2
    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
    74,533

    Re: Another coolant/radiator/headgasket question

    You may well have loosened some crud that clogged the purge line. Check it. If you don't know what or where it is, do a search for it.

  4. #3
    tpis15's Avatar
    tpis15 is offline Cadillac Owners Member
    Automobile(s): 95 aurora + 97 seville sls
    Join Date
    Jun 2007
    Location
    NE PA
    Age
    26
    Posts
    23

    Re: Another coolant/radiator/headgasket question

    The system could be airlocked, you may have to "burp" it.

  5. #4
    pimpdaddycaddy91's Avatar
    pimpdaddycaddy91 is offline Cadillac Owners Fanatic
    Join Date
    May 2005
    Location
    West Valley City, Utah, United
    Age
    32
    Posts
    122
    Thread Starter

    Re: Another coolant/radiator/headgasket question

    Well Ive had my Eldo sitting for awhile and I decided to take it to the dealer to see if they could figure it out. I first spent about $400 because they said it was the water pump. Well no change. So I took it back and spent another $100. They said they pressure tested the radiator and that it never showed any increase of pressure which led them to believe that it wasnt a head gasket but they said the cap was bad. So they replaced the cap even though I had already done that and still no change.

    Now it starts a little rough but smooths out and drives just fine it just loses coolant out the overflow.
    I have checked the purge line twice and it is good and now I notice quite a bit of steamy white smoke out of the exhaust.
    So I think that it is a head gasket but the dealer said they "didn't think so" but I haven't been back since the last time they worked on it.

    My question is does anybody think it could be anything else? If it is a headgasket would I be better of fixing this one or buying a remanufactured engine and from where? I am very mechanical myself. I have rebuilt engines and trannys in the past but have never torn into a Northstar. Its just that I figure that if Im going to pull the engine to do the HGs I might as well do the whole engine with it having 110,000 miles. What do you think?

  6. #5
    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
    74,533

    Re: Another coolant/radiator/headgasket question

    Now it starts a little rough but smooths out and drives just fine it just loses coolant out the overflow.
    It is almost certainly a head gasket with those symptoms. If you are going to drop the drivetrain yourself, you may as well Timesert it and replace the head gaskets.

  7. #6
    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
    1,680

    Re: Another coolant/radiator/headgasket question

    If you pull it, just do the head gaskets and inserts, don't dig any deeper into the engine than you need to. I just finished mine last month and when I took the heads off, there was no wear in the cylinder walls at all, no ridge of anykind, even the original honing marks in the cylinder walls were plain as day. Mine had 116K on it. Costs can quickly get out of hand if you start pulling stuff apart just because you have the engine out. Unless you have other issues with the engine stick to the head gaskets, and maybe valve seals and new valve cover and water pump crossover gaskets. Check your heater pipes on the back of the engine closely, one of mine was corroded right thru on the back passenger side of the engine at one of the bends. It didn't leak until I tugged on the heater hoses to disconnect the engine from the firewall.

  8. #7
    misfit6794 is offline Cadillac Owners Connoisseur
    Automobile(s): 1996 Deville (sold), 2000 Mustang GT
    Join Date
    Jan 2007
    Location
    Jersey
    Age
    30
    Posts
    1,300

    Re: Another coolant/radiator/headgasket question

    The system could be airlocked, you may have to "burp" it.
    The n* is self purging of air.

    It definetly sounds like a headgasket. Especially with the rough idle and the fact that you've replaced nearly every other part of the cooling system, thats usually the biggest symptom.

    A northstar isn't your typical engine, but since you have some experience you definetly could attempt it yourself. The biggest pain in the ass with the hg's is that you have to drop the whole front subframe out of the car, so if you don't have a lift its a bitch. If you manage to get the engine out you need to rethread all 20 headbolt threads in the block with timeserts, alot of fun. There's a good reason mechanics charge between 2500-3500 to do it.

  9. #8
    pimpdaddycaddy91's Avatar
    pimpdaddycaddy91 is offline Cadillac Owners Fanatic
    Join Date
    May 2005
    Location
    West Valley City, Utah, United
    Age
    32
    Posts
    122
    Thread Starter

    Re: Another coolant/radiator/headgasket question

    Thanks for the replys and info. I know I'll have to drop the whole engine and I'm sure I can handle that I just want to do some more research on performing the timeserts. I don't know when I can get started on it but if I don't have to rebuild the whole engine, just the HGs and timeserts I'll stick to that.

  10. #9
    misfit6794 is offline Cadillac Owners Connoisseur
    Automobile(s): 1996 Deville (sold), 2000 Mustang GT
    Join Date
    Jan 2007
    Location
    Jersey
    Age
    30
    Posts
    1,300

    Re: Another coolant/radiator/headgasket question

    You shouldn't need to rebuild it, once you get the heads off just take a good look at the heads for any warping or cracking from overheating, usually not the case. There's a ton of info on this site, several members have done the hg's themselves.

  11. #10
    zonie77 is offline Cadillac Owners Connoisseur
    Automobile(s): 94 ETC,97 STS
    Join Date
    Sep 2003
    Location
    Arizona
    Posts
    3,531

    Re: Another coolant/radiator/headgasket question

    Here's some info.

    http://www.cadillacforums.com/forums...ir-part-i.html

    There's been quite a few guys doing this at home. It's a long job but not rocket science. There was a guy on recently that's been doing these in a one car garage.

  12. #11
    SpiritF4 is offline Cadillac Owners Member
    Automobile(s): Cadillac
    Join Date
    Nov 2007
    Posts
    6

    Re: Another coolant/radiator/headgasket question

    Has anyone tried K&W block sealant?

  13. #12
    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
    74,533

    Re: Another coolant/radiator/headgasket question

    Snake oil. Repairs in a bottle do not work.

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