Leak coolant , head gasket ?
- Thread starter MetalSlug
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I'm not sure what he has. There are different styles. Maybe his looks more like this, http://parts.nalleygmc.com/showAssembly.aspx?ukey_assembly=431285. Whatever his is this is probably what's leaking if there's a leak.
Originally Posted By: AVB
That could be it, I didn't know there were so many variations. Mine just goes straight from the passenger head to the drivers head then V'ees off from the drivers head to the throttle body.
U right, Mind was like the one bost above with the T thing. I was at the friend body shop today, their is 01-02 gmc suv, I pop the hood and look at the coolant line, it does have one like u , from left to right.
I take a picture of my truck today. Seem like my coolant line does run under the intake
That could be it, I didn't know there were so many variations. Mine just goes straight from the passenger head to the drivers head then V'ees off from the drivers head to the throttle body.
U right, Mind was like the one bost above with the T thing. I was at the friend body shop today, their is 01-02 gmc suv, I pop the hood and look at the coolant line, it does have one like u , from left to right.
I take a picture of my truck today. Seem like my coolant line does run under the intake
Okay, so you have a mysterious coolant leak, a mechanic who says he knows what is is (probably saw it with his own eyes), some of us guys second guessing him over the Internet, and you've now confirmed that the part we couldn't figure out if you even have does exist. Somehow I think your mechanic is probably right.
And hey, mechanicx: nice diagrams.
And hey, mechanicx: nice diagrams.
Originally Posted By: AVB
Is that picture of your truck?
Yes, I know it dirty, im scare to hose it down, since the knock sensor it under the intake, water get in and have to remove the intake.
Is that picture of your truck?
Yes, I know it dirty, im scare to hose it down, since the knock sensor it under the intake, water get in and have to remove the intake.
Originally Posted By: AVB
That doesn't look like it goes under the intake, it may just go up to the throttle body. I would try to trace the hose to see where it goes.
I will , mabe this weekent, I will clean the TB and clean the mass, then I will take off the air filter intake, that where I can see everything clearly,
now I dont see any drip coolant stuck under the oil drain plug area any more, and my coolant level is just weir , It have 3 different mark ( I use pencil and mark the level each time it change, it go up and down and up again) and keep monitor it week after week. I beleive its stop leak for some season, Like I say I will check coolant level more often. Save my moneys while im at it for be prepair to repair when i note it drop alot.
That doesn't look like it goes under the intake, it may just go up to the throttle body. I would try to trace the hose to see where it goes.
I will , mabe this weekent, I will clean the TB and clean the mass, then I will take off the air filter intake, that where I can see everything clearly,
now I dont see any drip coolant stuck under the oil drain plug area any more, and my coolant level is just weir , It have 3 different mark ( I use pencil and mark the level each time it change, it go up and down and up again) and keep monitor it week after week. I beleive its stop leak for some season, Like I say I will check coolant level more often. Save my moneys while im at it for be prepair to repair when i note it drop alot.
Originally Posted By: AVB
It may go under the intake its hard to tell from the picture. I just don't want you to pay for pulling the intake if it isn't needed.
I know, I will check it out, and yes since my coolant stop leak or I dont see the drop that stuck on oil drain plug area. and my coolant level is up and down up and down on full mark, so make me think I dont want take in for repair yet, I will keep monitor the level for a bit more until I take it in.
It may go under the intake its hard to tell from the picture. I just don't want you to pay for pulling the intake if it isn't needed.
I know, I will check it out, and yes since my coolant stop leak or I dont see the drop that stuck on oil drain plug area. and my coolant level is up and down up and down on full mark, so make me think I dont want take in for repair yet, I will keep monitor the level for a bit more until I take it in.
Originally Posted By: The_Eric
O/P said the back of the motor. Last I checked, the water pump isn't in the back...
It could be the head gasket(s) I suppose, but it could also be one of the coolant crossover passage plugs or a heater hose fitting leaking.
Could you tell us which side it's leaking coolant from?
Last I checked, I have one in the driveway, none of the parts you mentioned are located where he found the drops of coolant.
Last I checked, I am a mechanic, fluids at the front of an engine can get blown rearward from air movement.
Last I checked, I have actually replaced these waterpumps, this is a pattern failure for the LT1 engine series.
Last I checked, condesending comments like your's hampered contribution!
O/P said the back of the motor. Last I checked, the water pump isn't in the back...
It could be the head gasket(s) I suppose, but it could also be one of the coolant crossover passage plugs or a heater hose fitting leaking.
Could you tell us which side it's leaking coolant from?
Last I checked, I have one in the driveway, none of the parts you mentioned are located where he found the drops of coolant.
Last I checked, I am a mechanic, fluids at the front of an engine can get blown rearward from air movement.
Last I checked, I have actually replaced these waterpumps, this is a pattern failure for the LT1 engine series.
Last I checked, condesending comments like your's hampered contribution!
ls1mike
$50 Site Donor 2026
Originally Posted By: 229
Last I checked, I have actually replaced these waterpumps, this is a pattern failure for the LT1 engine series.
2000 would be a 5.3 LM7 an LSx based motor. This motor shares nothing with the LT1, which is a traditional SBC with a reverse flow cooling system and an Opti-spark to replace the distributor.
The modern LT1 was used from 1992 to 1997. It was used in some larger cars like the Caprice (which also could be had with a 4.3 LT1), F-bodies and Corvettes. The water pump in an LT1 is driven straight off the Cam through a gear drive and coupler. It does not have a belt.
I may not be a Mechanic, but have had 2 LT1 cars, 3 LS1 F-bodies and 2 LSx based trucks. So I know a little bit about them.
Last I checked, I have actually replaced these waterpumps, this is a pattern failure for the LT1 engine series.
2000 would be a 5.3 LM7 an LSx based motor. This motor shares nothing with the LT1, which is a traditional SBC with a reverse flow cooling system and an Opti-spark to replace the distributor.
The modern LT1 was used from 1992 to 1997. It was used in some larger cars like the Caprice (which also could be had with a 4.3 LT1), F-bodies and Corvettes. The water pump in an LT1 is driven straight off the Cam through a gear drive and coupler. It does not have a belt.
I may not be a Mechanic, but have had 2 LT1 cars, 3 LS1 F-bodies and 2 LSx based trucks. So I know a little bit about them.
Originally Posted By: ls1mike
229 said:
Originally Posted By: 229
Originally Posted By: The_Eric
O/P said the back of the motor. Last I checked, the water pump isn't in the back...
It could be the head gasket(s) I suppose, but it could also be one of the coolant crossover passage plugs or a heater hose fitting leaking.
Could you tell us which side it's leaking coolant from?
Last I checked, I have one in the driveway, none of the parts you mentioned are located where he found the drops of coolant.
Last I checked, I am a mechanic, fluids at the front of an engine can get blown rearward from air movement.
Last I checked, I have actually replaced these waterpumps, this is a pattern failure for the LT1 engine series.
Last I checked, condesending comments like your's hampered contribution!
I could see how one could take that as condescending... But it wasn't meant to be. Sorry about that, in the world of the web, it can be hard to convey emotions or inflection. I should have put a smiley at the end.
I too have replaced these pumps and know all too well that the gaskets are prone to failure... Since the o/p mentioned the rear of the engine, I kind of assumed that he already covered the front, thus my suggestions. Also, while I have yet to see one of the crossover plugs (at the corner of the cylinder head) leak, several that I've taken off have had degraded gaskets and/or corrosion on the head/gasket frame, so I believe it's quite possible for them to leak.
Originally Posted By: The_Eric
O/P said the back of the motor. Last I checked, the water pump isn't in the back...
It could be the head gasket(s) I suppose, but it could also be one of the coolant crossover passage plugs or a heater hose fitting leaking.
Could you tell us which side it's leaking coolant from?
Last I checked, I have one in the driveway, none of the parts you mentioned are located where he found the drops of coolant.
Last I checked, I am a mechanic, fluids at the front of an engine can get blown rearward from air movement.
Last I checked, I have actually replaced these waterpumps, this is a pattern failure for the LT1 engine series.
Last I checked, condesending comments like your's hampered contribution!
I could see how one could take that as condescending... But it wasn't meant to be. Sorry about that, in the world of the web, it can be hard to convey emotions or inflection. I should have put a smiley at the end.
I too have replaced these pumps and know all too well that the gaskets are prone to failure... Since the o/p mentioned the rear of the engine, I kind of assumed that he already covered the front, thus my suggestions. Also, while I have yet to see one of the crossover plugs (at the corner of the cylinder head) leak, several that I've taken off have had degraded gaskets and/or corrosion on the head/gasket frame, so I believe it's quite possible for them to leak.
Originally Posted By: The_Eric
Originally Posted By: 229
Originally Posted By: The_Eric
O/P said the back of the motor. Last I checked, the water pump isn't in the back...
It could be the head gasket(s) I suppose, but it could also be one of the coolant crossover passage plugs or a heater hose fitting leaking.
Could you tell us which side it's leaking coolant from?
Last I checked, I have one in the driveway, none of the parts you mentioned are located where he found the drops of coolant.
Last I checked, I am a mechanic, fluids at the front of an engine can get blown rearward from air movement.
Last I checked, I have actually replaced these waterpumps, this is a pattern failure for the LT1 engine series.
Last I checked, condesending comments like your's hampered contribution!
I could see how one could take that as condescending... But it wasn't meant to be. Sorry about that, in the world of the web, it can be hard to convey emotions or inflection. I should have put a smiley at the end.
I too have replaced these pumps and know all too well that the gaskets are prone to failure... Since the o/p mentioned the rear of the engine, I kind of assumed that he already covered the front, thus my suggestions. Also, while I have yet to see one of the crossover plugs (at the corner of the cylinder head) leak, several that I've taken off have had degraded gaskets and/or corrosion on the head/gasket frame, so I believe it's quite possible for them to leak.
so you say the head gasket corner is leak ?
Originally Posted By: 229
Originally Posted By: The_Eric
O/P said the back of the motor. Last I checked, the water pump isn't in the back...
It could be the head gasket(s) I suppose, but it could also be one of the coolant crossover passage plugs or a heater hose fitting leaking.
Could you tell us which side it's leaking coolant from?
Last I checked, I have one in the driveway, none of the parts you mentioned are located where he found the drops of coolant.
Last I checked, I am a mechanic, fluids at the front of an engine can get blown rearward from air movement.
Last I checked, I have actually replaced these waterpumps, this is a pattern failure for the LT1 engine series.
Last I checked, condesending comments like your's hampered contribution!
I could see how one could take that as condescending... But it wasn't meant to be. Sorry about that, in the world of the web, it can be hard to convey emotions or inflection. I should have put a smiley at the end.
I too have replaced these pumps and know all too well that the gaskets are prone to failure... Since the o/p mentioned the rear of the engine, I kind of assumed that he already covered the front, thus my suggestions. Also, while I have yet to see one of the crossover plugs (at the corner of the cylinder head) leak, several that I've taken off have had degraded gaskets and/or corrosion on the head/gasket frame, so I believe it's quite possible for them to leak.
so you say the head gasket corner is leak ?
Originally Posted By: MetalSlug
Originally Posted By: The_Eric
Originally Posted By: 229
Originally Posted By: The_Eric
O/P said the back of the motor. Last I checked, the water pump isn't in the back...
It could be the head gasket(s) I suppose, but it could also be one of the coolant crossover passage plugs or a heater hose fitting leaking.
Could you tell us which side it's leaking coolant from?
Last I checked, I have one in the driveway, none of the parts you mentioned are located where he found the drops of coolant.
Last I checked, I am a mechanic, fluids at the front of an engine can get blown rearward from air movement.
Last I checked, I have actually replaced these waterpumps, this is a pattern failure for the LT1 engine series.
Last I checked, condesending comments like your's hampered contribution!
I could see how one could take that as condescending... But it wasn't meant to be. Sorry about that, in the world of the web, it can be hard to convey emotions or inflection. I should have put a smiley at the end.
I too have replaced these pumps and know all too well that the gaskets are prone to failure... Since the o/p mentioned the rear of the engine, I kind of assumed that he already covered the front, thus my suggestions. Also, while I have yet to see one of the crossover plugs (at the corner of the cylinder head) leak, several that I've taken off have had degraded gaskets and/or corrosion on the head/gasket frame, so I believe it's quite possible for them to leak.
so you say the head gasket corner is leak ?
I think he was refering to the crossover plug that you can see in the diagrams that were posted and not the headgasket.
Originally Posted By: The_Eric
Originally Posted By: 229
Originally Posted By: The_Eric
O/P said the back of the motor. Last I checked, the water pump isn't in the back...
It could be the head gasket(s) I suppose, but it could also be one of the coolant crossover passage plugs or a heater hose fitting leaking.
Could you tell us which side it's leaking coolant from?
Last I checked, I have one in the driveway, none of the parts you mentioned are located where he found the drops of coolant.
Last I checked, I am a mechanic, fluids at the front of an engine can get blown rearward from air movement.
Last I checked, I have actually replaced these waterpumps, this is a pattern failure for the LT1 engine series.
Last I checked, condesending comments like your's hampered contribution!
I could see how one could take that as condescending... But it wasn't meant to be. Sorry about that, in the world of the web, it can be hard to convey emotions or inflection. I should have put a smiley at the end.
I too have replaced these pumps and know all too well that the gaskets are prone to failure... Since the o/p mentioned the rear of the engine, I kind of assumed that he already covered the front, thus my suggestions. Also, while I have yet to see one of the crossover plugs (at the corner of the cylinder head) leak, several that I've taken off have had degraded gaskets and/or corrosion on the head/gasket frame, so I believe it's quite possible for them to leak.
so you say the head gasket corner is leak ?
I think he was refering to the crossover plug that you can see in the diagrams that were posted and not the headgasket.
Thanks.
I realize this thread is over a year old but I have to clarify one thing. On so many thread people swear that there are no coolant lines under the intake. That is WRONG!! I have a 99 Z71 with the 5.3L and it DOES have a coolant bypass line that connect the front of the head to the rear. How do I know? I had a leak down the back of the engine. I couldn't see the leak anywhere so I pulled the intake off. Sure enough there was a pinhole leak in the tube. Coolant does not run through the intake, it is a separate piece below the intake on 1999 and 2000 5.3's. Maybe some other years and engines, too. I'm not sure. The replacement piece has been updated to only connect the front of the heads together and blocks off the rear of the heads thus eliminating the piece under the intake. Hope this helps someone who may come across this thread in the future. BTW, the cheapest place I have found the replacement is at www.number1gmparts.com part # 12604711
Originally Posted By: MetalSlug
Originally Posted By: AVB
Is that picture of your truck?
Yes, I know it dirty, im scare to hose it down, since the knock sensor it under the intake, water get in and have to remove the intake.
When I worked at an auto auction we pressure washed the engine bays of GMT800 trucks all the time...none of them ever died or had problems from it while we had them. I think you would be safe hosing it down with the engine either cool or running, just take it for a drive afterwards to dry everything out.
Coolant leaks can be very intermittent and show up when they want to. My Explorer would spray coolant all over the engine from what I and a couple shops guessed was the intake manifold, but nobody could ever track it down for sure, so I left it alone. I never topped it off because the level never got low in the reservoir, but every couple weeks the telltale white coolant spray would show up. Just keep an eye on it and try to catch it when it's wet. Top off the reservoir as needed and track how much it's using.
FWIW, head gasket leaks can be internal, external, or both. So you may have a leaking head gasket, but if it's external only, you won't get any coolant in the oil. Likewise, a head gasket can leak internally, mixing oil and coolant, but show no leaks on the outside.
Your mechanic has actually seen the engine up close, and we have not, so for now I'd go with his diagnosis.
Originally Posted By: AVB
Is that picture of your truck?
Yes, I know it dirty, im scare to hose it down, since the knock sensor it under the intake, water get in and have to remove the intake.
When I worked at an auto auction we pressure washed the engine bays of GMT800 trucks all the time...none of them ever died or had problems from it while we had them. I think you would be safe hosing it down with the engine either cool or running, just take it for a drive afterwards to dry everything out.
Coolant leaks can be very intermittent and show up when they want to. My Explorer would spray coolant all over the engine from what I and a couple shops guessed was the intake manifold, but nobody could ever track it down for sure, so I left it alone. I never topped it off because the level never got low in the reservoir, but every couple weeks the telltale white coolant spray would show up. Just keep an eye on it and try to catch it when it's wet. Top off the reservoir as needed and track how much it's using.
FWIW, head gasket leaks can be internal, external, or both. So you may have a leaking head gasket, but if it's external only, you won't get any coolant in the oil. Likewise, a head gasket can leak internally, mixing oil and coolant, but show no leaks on the outside.
Your mechanic has actually seen the engine up close, and we have not, so for now I'd go with his diagnosis.
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