Need some info, I noticed a small spot a few weeks back of coolent and now its growing more and more, Any ideas on what it could be, I was thinking water pump, Lb7 168xxx miles
Help: Coolent Leak
- Thread starter JohnnyWalker22
- Start date
My water pump leaked slow thenn just went out completely. I guess its quite a job a time cosuming job so I paid to have it done. $610 they got me on the part tho..charged me $150
I was able to do the water pump in a day myself for the first time. Just make sure you get all the seals and gaskets before you start. The one I got only had 1 seal. But it works now and no leaks. It's actually pretty easy. There is a write up of it here somewhere. Helped me a lot.
Johnny Walker: Coolant leaks are often signs of a failing water pump. Not always. I just got done fixing a pesky coolant leak on my LB7. In the picture below you will see a 3" rubber hose with two clamps on each end. I originally thought the old, scarred knicked hose to be the source of my leak as it had coolant on it. Since I had the truck apart and that little hose was in bad shape, I replaced it and the clamps anyways. Come to find out the REAL source of the leak was a bad O ring on the pipe (right side of pic) that connects the bottom of the thermostat housing to the top of the water pump. It was dripping down from that pipe onto the little hose and at times the fan would throw bits of coolant spray around in the engine compartment. Getting that pipe back in without tearing the new O ring is tricky and you can use some bearing grease to lube the ring. Hope this helps, it may or may not be your problem just another thing to check for:thumb:
Thanks for the response guys ill make Shure I check all the stuff everyone mentioned and ill post what I find, thanks for time, chevy brotherly love
Have the system pressure tested. That will find the leak and save time. I just replaced my pump, 3 hours and $125 for parts.
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Johnny Walker: Coolant leaks are often signs of a failing water pump. Not always. I just got done fixing a pesky coolant leak on my LB7. In the picture below you will see a 3" rubber hose with two clamps on each end. I originally thought the old, scarred knicked hose to be the source of my leak as it had coolant on it. Since I had the truck apart and that little hose was in bad shape, I replaced it and the clamps anyways. Come to find out the REAL source of the leak was a bad O ring on the pipe (right side of pic) that connects the bottom of the thermostat housing to the top of the water pump. It was dripping down from that pipe onto the little hose and at times the fan would throw bits of coolant spray around in the engine compartment. Getting that pipe back in without tearing the new O ring is tricky and you can use some bearing grease to lube the ring. Hope this helps, it may or may not be your problem just another thing to check for:thumb:
It is not always necessary to remove that pipe. I didn't (so I wouldn't have to fight with it) and I have yet to have any problems. Also save me some time on the repair as well. But that might not always be the case. Go into it expecting to remove it, but try to do it without at first.
MicksDuramax:
We're could I have the system tested at? My buddy ussually helps me with all my work since he has a shop think he would have a system test
We're could I have the system tested at? My buddy ussually helps me with all my work since he has a shop think he would have a system test
I had mine tested at a service center (Grease Pro). They normally charge $20 but didn't charge me cause he thought I would be back for them to do the repairs.
If it is the waterpump the Lisle duramax flywheel lock too and a 36mm 12 point socket are needed to remved and intall/torque the damper bolt. the lock tool makes life alot easer.
See video on YouTube "How to change a Duramax 6.6 Water Pump" & "How to cut time in half Water Pump on a Chevy Duramax". This saved me a ton of time. The shop wanted to charge $875 and would take 8 to 9 hours.
Starting to think its not the water pump because of the location of the leak its passenger side right before the trans pan, can't really get up in there right this second to see if Thts the source buts it de pas side back a little further
It looks like it's running down the back of the engine & dripping off. Am I right?
If it's dripping off the back of the engine, there are some coolant hoses up on the top of the engine that you should check for leaks. I'd also take a look at the block heater(can't remember off-hand which side of the engine it's on though).
Is your truck CA emissions or Federal?
If it's dripping off the back of the engine, there are some coolant hoses up on the top of the engine that you should check for leaks. I'd also take a look at the block heater(can't remember off-hand which side of the engine it's on though).
Is your truck CA emissions or Federal?