What did you do with your GMT400 today...or yesterday....

[dbrannon79]

No, I didn't even think about the egg trick. yesterday evening after dropping some black pepper and topping it off it seemed to hold and from the looks of it, it stopped leaking almost right away! I will know for sure after work today, I have been normally getting a small puddle within a few minutes of parking in the driveway. it will usually leak until the pressure dissipates on the cooling system. I spotted the leak a couple weeks ago coming from the water jacket area on the passenger side top of the timing cover against the block near where the turbo oil line connects on the block.

What I'm afraid of is me tearing it down only to find that the timing cover aluminum housing in that area is rotted away and will be in need of a replacement cover. When I do get to the point of repairing or replacing the engine, I will need to look for another timing cover to have available. I know the one on the 6.2 I have is not the same since it doesn't have to port for the crank sensor.

 

[Big T]

Just a short 10 hour drive today to Paveltolz’s place where I completed the Red, White, and Blue 6.5 lineup:
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My ‘99 Burb still has vibration issues in the front. Has vibration while braking coming front right front. It increases from subtle while lightly braking, to a heavy shudder under heavy braking. It’s like the rotor is cracked, if I didn’t know better. It also increases as the brakes heat up. The rotors are worn and have a good lip on the outer edge. Pads have about 1/3 left. I will replace rotors and pads while up at the Montana home.

The service 4wd light came on during the trip and the light went out on the push button shift after shutting down for a break. Checked fuse and it’s fine. I suspect the 4wd actuator went out. I will test that while in Montana.

Paveltolz plugged in his Tech 2 and it had 3 codes. One was for low ECT. I saw it drop to 170 or 165 on a long downhill grade in CA early am.

Also had the following codes:
View attachment 98662
View attachment 98663

Not sure what those are about. We cleared all the codes and will see if they come back.

Up early tomorrow for the 8 hour drive to Montana. Anniversary was today but will celebrate tomorrow. I’m beat.

Installed new 195 thermostats for which the specs said they start to open at 190. Per my dash temp, it gets to 187.5 then quickly drops back to 185. The Service Engine Soon light went off by itself. So I conclude that the Engine Coolant issue is back to normal.

During my test drive, the braking is back to normal. No more vibration. Furthermore, no wheel vibration in the front at speeds above 70 mph. I conclude that those issues have been addressed.

Remaining issues: 1) address transfer case shifting, 2) install fresh reman ABS pump module. I will let Wayne at Eagle Watch automotive do these tasks.