2003 Tahoe coolant system leak or head gasket leak?

[mattbta]

I know everyone is saying #3 or 5...but on both of mine, it was passenger side. (I know, the second time was dumb luck because I could have installed that head on DS instead.)

Not positive (and i didn't mark which cylinder on passenger it was) but think this is the crack on my OEM 163k mile set:

 

[tomloans]

Thanks, good to know. Did you have the jelly on your valve cover as well?

 

[mattbta]

Yes, as seen in post 40: https://www.tahoeyukonforum.com/thr...-leak-or-head-gasket-leak.132246/post-1652668

 

[tomloans]

Yes, as seen in post 40: https://www.tahoeyukonforum.com/thr...-leak-or-head-gasket-leak.132246/post-1652668

Got it. Sorry Matt I didn't realize it was you. Alright well...Hmmm... LOL I am going to wait for Blackstone. If there is coolant found, I am going to pull the trigger on new heads, valley pan gasket, new knock sensors (one knock sensor is either broke or rust has blocked the grounding to the block and currently it is rewired to trick the system to keep going without the warning lights ), oil sensor while I am in there.

 

[tomloans]

Yes, as seen in post 40: https://www.tahoeyukonforum.com/thr...-leak-or-head-gasket-leak.132246/post-1652668

Also I was looking at your jelly pictures (LOL). It looks like driver's side had the most jelly even though passenger side had the crack in it. I think what happens is that the Jelly ends up blocking the PCV valve and hence the jelly is worse on the driver's side? Just a thought. Well if Blackstone gives me the thumbs up for coolant in the oil. Once removed, I will carefully examine the old heads and see where the crack(s) are. It will be interesting.

 

[iamdub]

Do the 799 heads require a different head gasket or anything else different. I can get a pretty good deal on a set of these. Will send pics shortly.

Nah, stock 5.3 head gasket.

 

[iamdub]

Also I was looking at your jelly pictures (LOL). It looks like driver's side had the most jelly even though passenger side had the crack in it. I think what happens is that the Jelly ends up blocking the PCV valve and hence the jelly is worse on the driver's side? Just a thought. Well if Blackstone gives me the thumbs up for coolant in the oil. Once removed, I will carefully examine the old heads and see where the crack(s) are. It will be interesting.

Have you looked under the passenger side cover?

 

[iamdub]

...As mentioned, my engine is super clean as you can see in the pictures. Not bragging but very clean for 200k miles.

Not bragging, here, either.

195K miles:

 

[tomloans]

Not bragging, here, either.

195K miles:

NICE!

 

[iamdub]

NICE!

Just let quality synthetic oil do its thing!

Did you check under that passenger side cover?