Page 1 of 2 12 LastLast
Results 1 to 20 of 36

Coolant leaking from back of engine somewhere?

This is a discussion on Coolant leaking from back of engine somewhere? within the General Help forums, part of the LSx Technical Help Section category; So I got a 00 T/A about two months ago I imeadiatly changed the oil and coolant after a 500 ...

  1. #1
    Junior Member
    Join Date
    Jul 2008
    Location
    Indio Hills, Ca (Palm Springs)
    Posts
    22

    Black
    00 WS6

    Coolant leaking from back of engine somewhere?

    So I got a 00 T/A about two months ago

    I imeadiatly changed the oil and coolant after a 500 mile drive home, well the next day Anyways ever since then it's been eating a small amount maybe 12-24oz of coolant on a 50-100 mile drive. I kinda figured it was just working the air pockets out. There is no milky oil or radiator fluid so I didn't think it was a head gasket as it drove and idled fine. No smoke in the exhaust either. Well tonight I finally caught it leaking after a hard drive home. It seemed to be leaking down from two places, one spot just outside the drivers side collector (it's got spl long tubes) and one on the passangers side onto the tubes just before they merged into the collector. They were hot so it was evaporating when it hit on the p-side and I couldn't really tell where it was comming from. I took a light underhood and checked around and couldn't find any leaks but saw alittle liquid on the firewall below the heater core but it didn't seem to lead to it. If it helps the radiator seemed full when I checked just before I drained it originally after the long drive home. Any ideas where it could be coming from, from behind the engine on both sides? It's only 5-10 drops it seemed once I get in my garage so it's not a massive leak.

    Thanks for any ideas or help you guys can provide.

    Forgot to add that the ps fluid is red not orange cause I saw a post where someone thought the ps cooler was leaking some how. I know it's normaly clear but though it might be some fancy new HiPo fluid since im not the original owner, who knows whats in there. Looked under the car for the ps cooler and couldn't find it. I thought it was std for the ws6 but no leaks forward of the steering rack, its all coming from behind the engine ending up by the collectors on the ground some how.
    Last edited by Mayron; 09-02-2008 at 11:31 PM.

  2. #2
    Junior Member
    Join Date
    Aug 2008
    Location
    sumner
    Posts
    52

    red
    1999 Firehawk

    Are you sure it's not the drain for the A/C?

  3. #3
    O U 8 1 2 Spaz's Avatar
    Join Date
    Nov 1999
    Location
    over here...
    Age
    39
    Posts
    25,692

    []D [] []V[] []D
    1999 trans am

    Quote Originally Posted by Mayron View Post
    So I got a 00 T/A about two months ago

    I imeadiatly changed the oil and coolant after a 500 mile drive home, well the next day Anyways ever since then it's been eating a small amount maybe 12-24oz of coolant on a 50-100 mile drive. I kinda figured it was just working the air pockets out. There is no milky oil or radiator fluid so I didn't think it was a head gasket as it drove and idled fine. No smoke in the exhaust either. Well tonight I finally caught it leaking after a hard drive home. It seemed to be leaking down from two places, one spot just outside the drivers side collector (it's got spl long tubes) and one on the passangers side onto the tubes just before they merged into the collector. They were hot so it was evaporating when it hit on the p-side and I couldn't really tell where it was comming from. I took a light underhood and checked around and couldn't find any leaks but saw alittle liquid on the firewall below the heater core but it didn't seem to lead to it. If it helps the radiator seemed full when I checked just before I drained it originally after the long drive home. Any ideas where it could be coming from, from behind the engine on both sides? It's only 5-10 drops it seemed once I get in my garage so it's not a massive leak.

    Thanks for any ideas or help you guys can provide.

    Forgot to add that the ps fluid is red not orange cause I saw a post where someone thought the ps cooler was leaking some how. I know it's normaly clear but though it might be some fancy new HiPo fluid since im not the original owner, who knows whats in there. Looked under the car for the ps cooler and couldn't find it. I thought it was std for the ws6 but no leaks forward of the steering rack, its all coming from behind the engine ending up by the collectors on the ground some how.

    are oyu sure it's not trans fluid??? could be running down the drive shaft and getting slung all over...

  4. #4
    COTM July '09
    Join Date
    Jun 2008
    Location
    Annapolis, MD
    Posts
    1,111

    BLK/BLK w/CGM Stripes
    2010 Camaro 2SS/M6

    What intake? LS6? Check the steam tube plugs at the back of the intake (you'll have to take the intake off to see), if those bolts get loose or the seal goes bad, they'll leak just like you're experiencing.

  5. #5
    Junior Member
    Join Date
    Jul 2008
    Location
    Indio Hills, Ca (Palm Springs)
    Posts
    22

    Black
    00 WS6

    Quote Originally Posted by mike13 View Post
    Are you sure it's not the drain for the A/C?
    Yes, it's not water. The leaking fluid is orange and doesn't feel like oil to me between my fingers.

  6. #6
    Junior Member
    Join Date
    Jul 2008
    Location
    Indio Hills, Ca (Palm Springs)
    Posts
    22

    Black
    00 WS6

    Quote Originally Posted by Spaz View Post
    are oyu sure it's not trans fluid??? could be running down the drive shaft and getting slung all over...
    The drops of fluid are hitting the same spot on the ground so it's not like it's all over. It's more like it's dribbling somewhere and leaking down to a point before it free falls to the ground. Fluid seem like delcool on the ground as it's orange and not oil. The power steering fluid looks more like the trans fluid than the dexcool.

  7. #7
    Junior Member
    Join Date
    Jul 2008
    Location
    Indio Hills, Ca (Palm Springs)
    Posts
    22

    Black
    00 WS6

    Quote Originally Posted by That Guy 2-1 View Post
    What intake? LS6? Check the steam tube plugs at the back of the intake (you'll have to take the intake off to see), if those bolts get loose or the seal goes bad, they'll leak just like you're experiencing.
    Ya know, I'm really not 100% sure. I guess it had the fast intake on it before but after it went through a couple people who couldn't afford it anymore; somehow it ended back up w/ a stock one painted that fast beige color. How can I id it? If I pull it off do I need new gaskets or can I reuse the current ones? I can't feel around the back side of the intake for those loose bolts w/o pulling it?

    Thanks for the advice everyone!

  8. #8
    COTM July '09
    Join Date
    Jun 2008
    Location
    Annapolis, MD
    Posts
    1,111

    BLK/BLK w/CGM Stripes
    2010 Camaro 2SS/M6

    does the fluid taste sweet? if so, it's coolant. Don't drink it but a light taste wont kill you ... lol

    You can reuse the gaskets on the intake. I guess you can feel around back, but it'll be easier to pull the intake to see exactly what you're doing ... only a couple 8mm headed bolts

  9. #9
    Junior Member
    Join Date
    Jul 2008
    Location
    Indio Hills, Ca (Palm Springs)
    Posts
    22

    Black
    00 WS6

    Quote Originally Posted by That Guy 2-1 View Post
    does the fluid taste sweet? if so, it's coolant. Don't drink it but a light taste wont kill you ... lol

    You can reuse the gaskets on the intake. I guess you can feel around back, but it'll be easier to pull the intake to see exactly what you're doing ... only a couple 8mm headed bolts
    I didn't get a chance to taste the fluid as it had all evaporated by the time I got around to the garage last night. It was too late to go on a joy ride and make it leak again too but I'd assume that if was any type of oil it would have left a residue on the floor.

    I felt around the back of the intake manifold (man it's tight back there) and didn't feel anything loose back there. Where exactly would the coolant be comming from on the intake anyways, isn't it all plastic and there for, does not circulate coolant? I'll try pulling it in the next couple days to to make sure thought. Can I just disconnet the injectors @ the power or is it best to pull them out of the intake to keep everything connected? Anything other things that I can avoid pulling off or do I pretty much need to disconnect everything on, near and around it?

    Thanks for the help!

  10. #10
    Veteran 0rion's Avatar
    Join Date
    Aug 2005
    Location
    ohio
    Posts
    22,519

    98 Formula
    06 duramax

    check the weep hole in the bottom of the water pump and make sure it's not coming from there and if it's not then you can feel on the back of the heads at the steam ports and see if it's leaking back there. Look at the front of the heads and you'll see a little metal tube that goes to each head....the rear will be the same unless someone put an ls6 intake on there and went with the ls6 plugs in the rear in which case there will be plugs in those ports. I'd first check the weep hole and make sure it isn't leaking from there and running back along the oil pan or something.

  11. #11
    Junior Member
    Join Date
    Jul 2008
    Location
    Indio Hills, Ca (Palm Springs)
    Posts
    22

    Black
    00 WS6

    Quote Originally Posted by 0rion View Post
    check the weep hole in the bottom of the water pump and make sure it's not coming from there and if it's not then you can feel on the back of the heads at the steam ports and see if it's leaking back there. Look at the front of the heads and you'll see a little metal tube that goes to each head....the rear will be the same unless someone put an ls6 intake on there and went with the ls6 plugs in the rear in which case there will be plugs in those ports. I'd first check the weep hole and make sure it isn't leaking from there and running back along the oil pan or something.
    Thanks! That was exatcly the info I was looking for. I'll check it out tonight and see what I find. I have a feeling that's the issue. I'm guessing the FAST intake that was on there before I got the car would have been like the LS6 and had the plugs on the heads blocked off, right? I bet they came loose or something. Will pulling the intake give me better access to those plugs on the head or would I be waisting my time pulling it still?

    Thanks again!

  12. #12
    Veteran 0rion's Avatar
    Join Date
    Aug 2005
    Location
    ohio
    Posts
    22,519

    98 Formula
    06 duramax

    Quote Originally Posted by Mayron View Post
    Thanks! That was exatcly the info I was looking for. I'll check it out tonight and see what I find. I have a feeling that's the issue. I'm guessing the FAST intake that was on there before I got the car would have been like the LS6 and had the plugs on the heads blocked off, right? I bet they came loose or something. Will pulling the intake give me better access to those plugs on the head or would I be waisting my time pulling it still?

    Thanks again!
    if you pull the intake you'll have direct access to those rear ports. I would rule out that pump first as it's pretty common for them to leak. When mine went it was pretty obvious though that it was up front. Look just below and behind the crank pulley.
    I know I've read some pretty ghetto methods of dealing with those rear ports when swapping away from the LS1 intake so it's absolutely possible that something is up with those. I think it would be a fairly rare thing to have both leak at the same time unless they have a rear pipe between both that's leaking.

  13. #13
    Junior Member
    Join Date
    Jul 2008
    Location
    Indio Hills, Ca (Palm Springs)
    Posts
    22

    Black
    00 WS6

    Quote Originally Posted by 0rion View Post
    if you pull the intake you'll have direct access to those rear ports. I would rule out that pump first as it's pretty common for them to leak. When mine went it was pretty obvious though that it was up front. Look just below and behind the crank pulley.
    I know I've read some pretty ghetto methods of dealing with those rear ports when swapping away from the LS1 intake so it's absolutely possible that something is up with those. I think it would be a fairly rare thing to have both leak at the same time unless they have a rear pipe between both that's leaking.
    I'm going to try and get it to leak in the garage right now to rule out it leaking from the pump. It looks clean up front but I'll know for sure w/ 0 air flow pushing the fluid around. Once I confirm it's not the pump and the car cools off I'll pull the intake and check for that leak behind the heads. I'm thinking there might be a crossover tube as the the front ports were redone w/ an line. I'll let you know what I find. Thanks!

  14. #14
    Junior Member
    Join Date
    Jul 2008
    Location
    Indio Hills, Ca (Palm Springs)
    Posts
    22

    Black
    00 WS6

    It's definately coming from the drivers side and it tastes sweet. I could actually see drops falling just below the last cylinder's exhaust port onto the header collector. I'm guessing it has to be from that port leaking right? I'll pull the intake off later once it cools off and check that plug. Don't suppose anyone has a picture showing the location or know about the the size of a bolt someone might use to block off the passage(we talking ~10 or ~15mm+)?

  15. #15
    Veteran 0rion's Avatar
    Join Date
    Aug 2005
    Location
    ohio
    Posts
    22,519

    98 Formula
    06 duramax

    if memory serves me correctly it's a 10mm bolt on that plug. Look at the front of the heads and there's a coolant pipe going from one head to the other that passes under the throttle body. Those will be the same size as the plugs on the back. Those plugs have a little o-ring around them...that could be your problem.
    Here's a pic I borrowed from ls1howto that shows the original 97-00 pipe. If you have an ls6 or aftermarket intake though they probably used the new way with a pipe across the front and plugs for the back. You can see the "block" on the drivers side head in this pic just above that rubber hose.


  16. #16
    Junior Member
    Join Date
    Jul 2008
    Location
    Indio Hills, Ca (Palm Springs)
    Posts
    22

    Black
    00 WS6

    So I'm stuck on the fuel line, manifold's loose but according to ls1howto I need a special tool to get the fuel line off?!? Is there another way and if not where would one get such a tool, Kragen/Autozone or is it a special order thing?

  17. #17
    Junior Member
    Join Date
    Jul 2008
    Location
    Indio Hills, Ca (Palm Springs)
    Posts
    22

    Black
    00 WS6

    Ok, I got the fuel line dissconected after picking up a decent set of spring loaded aluminium fuel line tools @ autozone. It's definatly coming from that back port. It never ceases to amaze me how someone can do all this work to an engine and then use jb weld to block a cooling passage instead of just tapping it and installing a plug/bolt. I really wish I knew who did all this work so I could make it my mission to destroy their reputation and keep them from ever giving anyone any type of advice or work on a car again. Sorry just had to vent little. I'm just blown away by stupidity sometimes.

    Anyways, I've already got a set of taps to thread that coolant hole but I thought someone else might have some experience on the process, like how far down to tap and what length/type of bolt or plug might work best. ls1howto reused the old line which I don't have so if anyone can provide any helpful info, it would be much appreciated.

  18. #18
    Junior Member
    Join Date
    Aug 2008
    Location
    sumner
    Posts
    52

    red
    1999 Firehawk

    Help me understand, there's a cooling passage in the head? intake? that isn't used so it needs to be plugged with a bolt or pipe plug? Is that correct?

  19. #19
    Junior Member
    Join Date
    Jul 2008
    Location
    Indio Hills, Ca (Palm Springs)
    Posts
    22

    Black
    00 WS6

    Quote Originally Posted by mike13 View Post
    Help me understand, there's a cooling passage in the head? intake? that isn't used so it needs to be plugged with a bolt or pipe plug? Is that correct?
    Yep, pretty much. It's in the drivers side head where that red line in the pic above is running to up top. I think it's part of the cooling mods required for the ls6/fast intake manifolds, cause of the flat bottems right? I've actully been probing around w/ a piece of wire in the hole trying to gauge depth and I'm starting to lean more twords getting the proper fitting from gm and plugging it where the line would normaily go instead. Is that a reasonable thing to do or I'm I over thinking this?

  20. #20
    Junior Member
    Join Date
    Aug 2008
    Location
    sumner
    Posts
    52

    red
    1999 Firehawk

    Or if someone can tell you the proper size and thread pitch

Page 1 of 2 12 LastLast

Thread Information

Users Browsing this Thread

There are currently 1 users browsing this thread. (0 members and 1 guests)

Similar Threads

  1. Leaking Coolant
    By blackcar in forum External Engine
    Replies: 24
    Last Post: 02-24-2011, 02:09 PM
  2. leaking coolant
    By Spikito in forum External Engine
    Replies: 8
    Last Post: 04-04-2009, 12:22 AM
  3. Coolant Leaking Somewhere
    By 317Born in forum External Engine
    Replies: 11
    Last Post: 07-13-2008, 10:41 AM
  4. Question: Leaking Coolant
    By TransAmFanatic in forum General Help
    Replies: 6
    Last Post: 07-07-2008, 09:45 PM
  5. coolant leaking
    By oh2bequick in forum General Help
    Replies: 1
    Last Post: 07-07-2008, 08:44 PM

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •