Coolant leak, can't pinpoint.

[AN292]

I was having a decent leak, filling the reservoir every few days. I used a radiator stop leak and that fixed it right up for a few months. Now the leak is back, I used the stop leak again and it didnt seem to stop it. Im seeing puddles now, not just little drips.

So, I cant exactly pin point where its coming from, I will have to get underneath it one of these days.

The leak is near the front, so I'm thinking water pump.

Is there a known spot where coolant leaks that I dont know about?

Thanks

 

[ivin74]

Inspect the heater hose tees on the left side of the engine bay at the firewall, those things are known to leak.

 

[Jason in DLH]

Inspect the heater hose tees on the left side of the engine bay at the firewall, those things are known to leak.

And bust wide open when driving down the road making it look like your going to explode. Well, not sure if that is common, but it happened to me.

 

[Big Mama]

Good advice above. Can you be more specific with the location? I’d hold off on any more stop leak.

 

[ivin74]

Donot buy the dorman tees they only last about a year.

 

[Bill 1960]

+1 don’t by Dorman ANYTHING if it’s a part that will leave you stranded when it fails.

 

[gooffeyguy]

My son was having the same problem with our 2001 last fall (he had it with him at college) and couldn't pinpoint where the leak was. He said the coolant puddle overnight would be under the center of the motor. I told him to remove the front splash shield that way if the leak was near the front of the engine it would be easier to pinpoint by not running down the splash shield.

He found it was coming from the bottom of the water pump. We replaced the water pump (and the fan clutch). When we pulled the water pump off, the internal vanes just disintegrated. It was the original pump, 220k miles.

 

[Larryjb]

A coolant pressure tester was one of the best purchases I made. You hook it up and pressurize the cooling system then look around all over the place for where the leak is. I have found so many leaks this way.

Some have said a few leaks don't show until the engine is warm. However, so far I have caught every leak:

Thermostat housing leak
Water pump leak (one didn't show until I left the tester on overnight, saw the puddle in the morning underneath the water pump)
heater hose connection leak
radiator tank leak
cracked head leak (required removal of the valve cover)

Some of these leaks were on multiple vehicles which means I have caught about 10-15 leaks over the years this way.

The only leak that didn't show wasn't a leak until it broke while driving. So, I recommend changing all plastic T's every coolant change using GM T's, not Dorman.

 

[Doubeleive]

Like Tom said look directly under the water pump, you will need a flashlight and look kind of from the bottom side at a angle, just shine your flashlight up to the bottom of the water pump, if you have one of those telescoping mirror's (there like $2 at the autoparts store) then you can look at it from up top by angling the mirror down under the water pump and using your flashlight to shine the light at the mirror reflecting up under the water pump.

 

[TJ Baker]

Tees are at RIGHT side of engine near firewall

 

[Rocket Man]

Tees are at RIGHT side of engine near firewall

Exactly. Passenger side.

 

[Larryjb]

...repeated what Mark said

 

[corvette744]

I was having a decent leak, filling the reservoir every few days. I used a radiator stop leak and that fixed it right up for a few months. Now the leak is back, I used the stop leak again and it didnt seem to stop it. Im seeing puddles now, not just little drips.

So, I cant exactly pin point where its coming from, I will have to get underneath it one of these days.

The leak is near the front, so I'm thinking water pump.

Is there a known spot where coolant leaks that I dont know about?

Thanks

You need to at least get under the vehicle and look around we cant diagnose something without a visual.Get a pressure tester and look and you will see it quick.Especially if your seeing puddles now should be easy to spot.

 

[FrankU]

Those Gruven T's are sure expensive, but it gives piece of mind that the plastic T's don't.

Link to Gruven parts :

https://www.gruvenparts.com/billet-gm-heater-core-coolant-tees/

You will need 2.

Those plastic T's are very unreliable and break (leak) often.

 

[Molly454]

I was having a decent leak, filling the reservoir every few days. I used a radiator stop leak and that fixed it right up for a few months. Now the leak is back, I used the stop leak again and it didnt seem to stop it. Im seeing puddles now, not just little drips.

So, I cant exactly pin point where its coming from, I will have to get underneath it one of these days.

The leak is near the front, so I'm thinking water pump.

Is there a known spot where coolant leaks that I dont know about?

Thanks

I just had my battery changed out because it kept going dead after a starter replacement. Turns out it was the rubber boot on the 2 positive cables that was preventing a connection. While under the hood, my young mechanic noticed coolant leaking on top of the block where the heater hose connector screws in. He says they crack often. $10 part.

 

[gooffeyguy]

Those Gruven T's are sure expensive, but it gives piece of mind that the plastic T's don't.

Link to Gruven parts :

https://www.gruvenparts.com/billet-gm-heater-core-coolant-tees/

You will need 2.

Those plastic T's are very unreliable and break (leak) often.

Except for the short pieces of hose and all the hose clamps to connect them. More points of possible failure

Sent from my SM-G930V using Tapatalk

 

[Joseph Garcia]

At the strong recommendations of the folks here, I replaced the Tees with ACDelco Tees, even though they were much more expensive than the Dorman Tees.

 

[Fless]

At the strong recommendations of the folks here, I replaced the Tees with ACDelco Tees, even though they were much more expensive in the short term than the Dorman Tees.

FYP

 

[Doubeleive]

since when are the heater hose T's located in the front?
per op:
"The leak is near the front, so I'm thinking water pump".
yes they are a common point of failure, but a leak in front will likely be from the radiator, water pump, or one of the 2 large hose.

 

[AN292]

Thanks to everyone for the replies. I read them all and will take them all into consideration for when the leak re-appears.

Funny enough the plastic adapter from the heater core in the firewall did infact blow up while I was driving this summer lmao. I replaced both adapters with OEM ones.

Like I said the stop leak ended up working so now I cant really find the leak until it comes back.

Anyway, I found this here, are these any clues to what's going on?

Pictures:

https://imgur.com/a/dthanUG