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  1. Matahoe

    2005 Tahoe Slow Coolant Loss

    The ears on the qd works fine for me. Takes a bit of patience but I used both hands on each side. Just make sure there is no junk behind the ears that would keep someone from depressing them. Also ...there is no barb on the T. Plus the hose is stretched unless using aftermarket hose cut to add...
  2. Matahoe

    2005 Tahoe Slow Coolant Loss

    Update: Had an incident the other day. The passenger side heater core T connector broke off and lost about 8 quarts of coolant (total capacity is about 18 I think). Had steam rolling out from under the hood so I pulled into a lot, opened the hood and there was coolant everywhere. Luckily I was...
  3. Matahoe

    2005 Tahoe Slow Coolant Loss

    From what I have gathered here in the forum there really is no need. The system is designed to allow air from the top of the radiator which is the highest point to escape through the hose that goes over the MAF and go directly to the reservoir. Now if you mean to run the engine for a bit while...
  4. Matahoe

    2005 Tahoe Slow Coolant Loss

    Yes I will check it out now that the uv dye is in. Evaporation? Not likely since the cap will not let pressure out unless overpressure from steam. And there is no steam with coolant unless the cap is removed to lower vapor pressure. It's basically a sealed system. I watched a few videos. The...
  5. Matahoe

    2005 Tahoe Slow Coolant Loss

    I don't know maybe I am dyslexic and things seem backwards in my eyes. I will keep an eye on it. Just really scratching my head for the past however many years.
  6. Matahoe

    2005 Tahoe Slow Coolant Loss

    That's what I would expect as well due to coolant expansion...hence the need for reservoir. It's almost like an air pocket appears only when engine heats up which seems very odd. The coolant gods are playing a trick on me. Hehe.
  7. Matahoe

    2005 Tahoe Slow Coolant Loss

    No this has been something I have noticed consistently over past years. Coolant level is always an inch or two below the full level mark on the side of the reservoir after engine is fully hot. Temperature on dash is always just below 210 (looks good) but we all know it's not going by the...
  8. Matahoe

    2005 Tahoe Slow Coolant Loss

    Sure. I went out to the truck the other day and checked the reservoir to add the tab/coolant mixture and the level in the reservoir was normal when engine was cold. When the engine is hot/warm the coolant level in the reservoir is down a few inches. Normal ops? I'm not sure.
  9. Matahoe

    2005 Tahoe Slow Coolant Loss

    I put the UV dye in coolant reservoir and didn't add the tabs yet because now I am not sure the coolant is going down now. Just something I noticed. Will keep an eye on it.
  10. Matahoe

    2005 Tahoe Slow Coolant Loss

    Ginger. Yeah. Now I'm thinking sushi. Hey it's only $4.
  11. Matahoe

    2005 Tahoe Slow Coolant Loss

    Alright. So I will add the tabs and some UV indicator. Will report back findings.
  12. Matahoe

    2005 Tahoe Slow Coolant Loss

    Guessing these are the ones?
  13. Matahoe

    2005 Tahoe Slow Coolant Loss

    Yeah. That higher stress means higher temps in the combustion chamber so any existing cracks in the coolant passages in the heads would widen. Makes sense. Likewise I notice coolant going down faster in the reservoir when downshifting / passing more often or in a hurry, etc.
  14. Matahoe

    2005 Tahoe Slow Coolant Loss

    Found this video a while back. Pretty cool info. I didn't realize the 862 heads were higher compression.
  15. Matahoe

    2005 Tahoe Slow Coolant Loss

    Hey you guys are giving great info here! And sorry for any late coming specific info. Will try the tabs and see if that works. I put some CRC fiber lock block sealer in it around 2017. But that was before the head rebuild project. I have some left..but will try the tabs. Engine has 220k on it so...
  16. Matahoe

    2005 Tahoe Slow Coolant Loss

    No smoke in exhaust and mine aren't Castech heads. "The Castech head issue in 5.3L GM Vortec engines (roughly 2001–2006) involves a manufacturing defect in 706 casting heads that causes cracking near the head bolt valley. This defect leads to significant, unexplained coolant loss, often...
  17. Matahoe

    2005 Tahoe Slow Coolant Loss

    Nevermind I mentioned a valve if there isn't one. Just thought there might have been one previously. Just wondering if coolant is constantly being circulated in both front and rear HVAC evap coils. Will rent a pressure tester again. Might still be tough finding the culprit if test is positive...
  18. Matahoe

    2005 Tahoe Slow Coolant Loss

    Will check that. But as I said no drips on ground anywhere except a leaking rear main seal but that's oil. Cap, new factory reservoir and new hoses have only 30k on them. I don't notice any steam or strong smells anywhere. The radiator area does smell a tad like hot coolant when warmed up. Hmm...
  19. Matahoe

    2005 Tahoe Slow Coolant Loss

    I had heads pressure tested to 4 x atm. Also developer dye crack inspected. No issues. No drips at all on the ground. Original heads were redone by me except the milling. Machinist said the heads were not warped. Just needed 7 thousandths milled. Not bad.
  20. Matahoe

    2005 Tahoe Slow Coolant Loss

    2005 Tahoe LT 5.3L, 220k miles, LM7. Slow coolant loss—no puddles, no drips, no sweet smell inside, no codes. UV dye's been in 10k miles—black light shows no leaks anywhere, no clear streaks or trails. Perhaps I am missing something common? Water pump replaced at 150k by prev owner, thermostat...
  21. Matahoe

    2003 Tahoe starts.... and dies

    Exactly. I understand your teaching him. But since it's his first ever post...maybe give him a break and tell him at the end?
  22. Matahoe

    2008 Tahoe runs and then shuts off

    Is this only in drive or in park or both?
  23. Matahoe

    2008 Tahoe runs and then shuts off

    I would be swapping relays with known new spares. That should give you more confidence in narrowing things down. Temperature soaking can help narrow things down but it might turn out to be intermittent event. Your choice. It depends on how much time you want to waste on this.
  24. Matahoe

    2008 Tahoe runs and then shuts off

    We can speculate all day. The OP needs to start taking careful notes of times when certain things happen. That will surely narrow it down. The PCM operates based on conditional inputs. Check the basic systems first (I.e starting, charging and engine. Move up the line checking each system off...
  25. Matahoe

    07+ Brake upgrade on a 00-06 NBS, is it worth it?

    Unless someone is using their vehicle outside the intended design limits then is there really a reason to upgrade? What's the point beside looking a bit different and costing more money? Is there any guarantee that a government vehicle inspector will not write me up, take away my license to...

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