What did you do to your NBS GMT800 Tahoe/Yukon Today?

[Rocket Man]

If never add any shit like that to my coolant. Lol
But a small update, I did take the valve covers off to inspect the heads. ZERO signs of coolant on either of the heads. No milkshake, no peanut butter, and no areas that were abnormallly clean or shiny. The ONLY sign of coolant or moisture was on the bottom of the oil fill cap. I'm starting to wonder if my oil got contaminated a while back when the plastic "T" at the heater core broke and sprayed coolant EVERYWHERE in my engine compartment. I've only changed my oil twice since then, and although it's far less,it's still showing trace amounts of coolant. I'm going to inspect the cylinders next as soon as the borescope camera comes in that I ordered off eBay. And I'm going to send in another oil sample after that, regardless of how many miles. I only have about 800 miles on this oil so far.
My lower intake gasket (the plate with the knock sensors) is leaking, so it's QUITE possible that coolant seeped in through that gasket when the T fitting exploded. But I still won't feel comfortable until I inspect each cylinder, and get a few more oil analysis tests done.

That is surely possible that coolant got into the oil through that valley cover if the gasket is leaking there. The oil passages are directly under it.

 

[SRQYukon]

Yes do the grille. Mine done.

View attachment 233572

Yes. Much better all color matched

 

[dirtedreamer]

I had it washed

 

[SRQYukon]

I had it washed

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Welcome to TYF, dirtedreamer. Tell us about your truck. Is that 2014/15 Silverado front clip with an aftermarket bumber?

 

[dirtedreamer]

Welcome to TYF, dirtedreamer. Tell us about your truck. Is that 2014/15 Silverado front clip with an aftermarket bumber?

it started as a yukon denali on 24s that was an auction car. 2009 denali front clip was changed to 07-13 silverado front end with fiberglass 4" wider fenders and fiberglass bumper cap over the skid plate and bumper. power mods forged 6.2 with minor bolt ons and tune had a turbo but with the big tires and fulltime aws it kept bending and breaking tie rods. 325/60-20 falken at3 on 20x10 raceline clutch wheels brakes 8 piston R1 concepts with 17" rotors in the front and rear 15.5 with 6 piston. re geared to 488s. Suspension mazzulla 4x4 mid travel kit with 2.5 Kings with adjusters front and rear and rear is the longer precision coil. theres a bunch of other stuff but thats the just of it. this week it will get new tie rods that can handle the power and new link arms and pan hard in the rear. it was purchased because they incorrectly totalled it no frame damage and it was dirt shit cheap so now i have a clean daily and weekend offroader. attached is the heim steering kit 1.25" .120 wall 3/4 heim inner with billet clevis and rack adapter 7/8 heim outer with 3/4 bolt and spindle getting drilled to accept that. all bolts 12 point NAS bolts with proper shanks and hardware

 

[HiHoeSilver]

Well then.

Welcome!

 

[Fless]

Recalibrated the HVAC systems, front and rear, with the Tech 2 since I wasn't getting heat in the rear. It works somewhat better now, but I'll have to delve into it some more the next time it's fully warmed up.

 

[Rocket Man]

I had it washed

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Interesting truck, it definitely has some nice stuff. Sounds like you scored in that auction. Just a FYI, this is the NBS (2000-2006) section. Welcome to the forum.

 

[Rocket Man]

Recalibrated the HVAC systems, front and rear, with the Tech 2 since I wasn't getting heat in the rear. It works somewhat better now, but I'll have to delve into it some more the next time it's fully warmed up.

Probably the blend door actuator. If you remove the passenger rear panel, you can pull the actuators and move the doors by hand to test.

 

[Fless]

I'll be into that as soon as I can make sure hot engine coolant is getting through that rear heater core.

EDIT: everything works correctly this morning, so the Tech 2 recal seems to have done its job. I'll watch it closely over the next few weeks to be sure it stays good.

 

[rgosart]

Picked up a cheap Bissell spot clean carpet extractor off Craigslist for $20 and cleaned my carpets.



Also parked next to a stock (and fairly tired looking) Tahoe. Wheels, tires, and a level really make a big difference!

 

[dszx13]

Maintenance on 3 trucks will break the bank[emoji849]

Sent from my iPhone using Tapatalk

 

[Doubeleive]

I'll be into that as soon as I can make sure hot engine coolant is getting through that rear heater core.

EDIT: everything works correctly this morning, so the Tech 2 recal seems to have done its job. I'll watch it closely over the next few weeks to be sure it stays good.

Once the engine is warmed up you can reach under the back of the truck and feel the lines to see if they are both warm, you can also take that rear hvac kick panel off and then stretch that nice long tech2 cable out to the back of the truck and command the rear actuator to hot or cold and you can see the if the actuator turns all the way or not, there are little guide lines on the plastic it should move all the way from one guide line to the other.

 

[BG1988]

I'll be into that as soon as I can make sure hot engine coolant is getting through that rear heater core.

EDIT: everything works correctly this morning, so the Tech 2 recal seems to have done its job. I'll watch it closely over the next few weeks to be sure it stays good.

i thought the rear used heating elements for the heater?

 

[Doubeleive]

i thought the rear used heating elements for the heater?

maybe on a hybrid, but not the gas trucks there is 2 coolant line's that split off to the rear at the firewall (common failure area for the "T" to break or crack)

 

[Sam Harris]

Was Saturday, but.. washed the nasty snow, mag chloride, salt and grime off. Didn’t have time for the normal detail, but at least she’s mostly clean. Parked next to my buddy’s Sierra at work.

 

[Fless]

Was Saturday, but.. washed the nasty snow, mag chloride, salt and grime off. Didn’t have time for the normal detail, but at least she’s mostly clean. Parked next to my buddy’s Sierra at work.

Looks great, Sam! I sure need to do mine after that snowy week we had.

 

[Fless]

Once the engine is warmed up you can reach under the back of the truck and feel the lines to see if they are both warm, you can also take that rear hvac kick panel off and then stretch that nice long tech2 cable out to the back of the truck and command the rear actuator to hot or cold and you can see the if the actuator turns all the way or not, there are little guide lines on the plastic it should move all the way from one guide line to the other.

That's the plan if/when it doesn't work right.

 

[Doubeleive]

That's the plan if/when it doesn't work right.

if the rear coolant lines are 1 hot & 1 cold then the rear heater core is clogged
if the blend door actuator does not move properly then it should be replaced, there are 2 in the back 1 controls hot/cold the other controls air up/down (floor/ceiling), there is also a rear blower resistor and a rear controller module, if neither of the rear actuators operate then the rear controller module is likely bad, if the rear fan does not blow then likely it is the rear blower resistor.
if all that works then possibly the little sensor in the headliner is faulty, the long wheel base have 2 (depending the year and system, some even have 3) one above the drivers head and the other is in the back above the right rear passenger, if it has 3 then the 3rd would be all the way in the back left rear headliner near the rear hatch.
beyond that if it is the digital system and depending on the year there are more temp sensors in the ducts they should have 5v volts power on the harness and to test one you take it out and apply heated air to the sensor and use a meter to test if the resistance changes when heat is applied.

 

[HiHoeSilver]

Picked up the new shoes. Will work towards install in the next few days. May require suspension adjustments/additions.