What could be busted, coolant leaking out 2000 Yukon Denali

[SBdadman]

So I noticed coolant was low, and mistakenly thought it was leaking from a busted coolant reservoir tank, so I changed the reservoir and hose.

Filled up reservoir with coolant to line, and it sat overnight, nothing leaking out underneath or dripping.

Crank it up and drive it and get to bank, get out and nothing still, go in and come back out and notice coolant dripping into a puddle underneath.

It appears to be dripping out near the front of the engine block near the bottom, right above the bottom pulley/belt?

Hasn't shown any overheating or anything on the actual dash. I took a video of the leak, any idea if it's water pump or thermostat or something bigger/smaller?

 

[jaywoo65]

Edited because I'm a dmbass. Water pump!!

 

[02Burgundybeast]

Id go with water pump.

 

[HiHoeSilver]

So I noticed coolant was low, and mistakenly thought it was leaking from a busted coolant reservoir tank, so I changed the reservoir and hose.

Filled up reservoir with coolant to line, and it sat overnight, nothing leaking out underneath or dripping.

Crank it up and drive it and get to bank, get out and nothing still, go in and come back out and notice coolant dripping into a puddle underneath.

It appears to be dripping out near the front of the engine block near the bottom, right above the bottom pulley/belt?

Hasn't shown any overheating or anything on the actual dash. I took a video of the leak, any idea if it's water pump or thermostat or something bigger/smaller?

If you had a flashlight up there with that same angle video, we could probably see better. Tough to say, could be either source mentioned above... Hoping for the pump. That's cheap and easy.

 

[BlueCollarTahoe]

water pump

 

[afpj]

Our intakes are dry. It's either the water pump/thermostat/hoses or possibly the coolant hose to the throttle body. The latter item leaking would be much rarer compared to the waterpump.

 

[M1Gunner]

With that location and amount of flow I'd be willing to put money on the water pump.

 

[StevenDey92]

I would go with waterpump!

Sent from my SM-G930V using Tapatalk

 

[rockola1971]

Weep hole is leaking your coolant out. The weep hole is there to show you that the mechanical seal of the water pump shaft (pulley attaches to) has failed and is now letting coolant get into the front bearing of the water pump. It wont be long...

And its impossible for it to be a intake manifold gasket since the Gen 3 and 4 motors have zero coolant flowing through their intakes.

 

[Silverbeast]

just replaced my intake on my 00 with 134k. The leak was behind the alternator cost me 1000 !!

 

[rockola1971]

just replaced my intake on my 00 with 134k. The leak was behind the alternator cost me 1000 !!

The leak wasnt your intake manifold since there is not coolant flowing through your Gen 3 (5.3l/6.0l) intake manifold. Id be talking to your mechanic and ask him what exactly he supposedly repaired for a grand!

 

[SBdadman]

So took it down the road to a guy and he said water pump, ordered the parts and any hoses in case it's a hose coming off the pump but I'm gonna replace it all, thanks for all the feedback and taking a look at the video. I just discovered this forum and I it's already become a good resource to figure some things out to hopefully keep my 2000 Denali alive as it nears 200k miles.

 

[rockola1971]

So took it down the road to a guy and he said water pump, ordered the parts and any hoses in case it's a hose coming off the pump but I'm gonna replace it all, thanks for all the feedback and taking a look at the video. I just discovered this forum and I it's already become a good resource to figure some things out to hopefully keep my 2000 Denali alive as it nears 200k miles.

Its not nearing death very soon. My 05 Denali is approaching 300k.

 

[Pachanga02]

I noticed a leak and after a week of looking for it I found it was the heater hose. It was actually the plastic y that has 2 hoses, connects to the firewall and the reservoir tank to the engine. Dealer part and cost me $110.

 

[Tonyrodz]

I noticed a leak and after a week of looking for it I found it was the heater hose. It was actually the plastic y that has 2 hoses, connects to the firewall and the reservoir tank to the engine. Dealer part and cost me $110.

This part?

 

[SBdadman]

Yea heater hose was one of the suggestions my dad had when I told him about it.

 

[Tonyrodz]

Yea heater hose was one of the suggestions my dad had when I told him about it.

I paid less then $20 for it. You paid $100 for it?

 

[rockola1971]

I noticed a leak and after a week of looking for it I found it was the heater hose. It was actually the plastic y that has 2 hoses, connects to the firewall and the reservoir tank to the engine. Dealer part and cost me $110.

Its not only a dealer part. Dorman makes them, any auto parts store has them as well as rockauto.. Did they give you a big ol kiss on the way out for your $110 coupling?

 

[Pachanga02]

Well damn now I feel like an ass @Tonyrodz yes that's the part, I didn't check much only went to Autozone which is a few min away and couldn't find it so I just went to dealer, it did come with hoses and clamps aswell.

 

[Tonyrodz]

Well damn now I feel like an ass @Tonyrodz yes that's the part, I didn't check much only went to Autozone which is a few min away and couldn't find it so I just went to dealer, it did come with hoses and clamps aswell.

When I bought mine, that was the only part, no hoses or clamps. Maybe you bought some kind of repair kit. The exact amount I paid was $19.87.