What did you do to your OBS GMT400 Tahoe/Yukon Today?

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retorq

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I had a hissing sound under the hood and i found the rubber elbow
that connects the pcv tube to the throttle body and another vacuum
hose was cracked replace them still had the hissing.... the gasket
under the throttle body was bad . I did notice a ruff idle for awhile
now it idles smooth and i will drive it mon. Then wed i decided
to replace the leaking heater hose connector that mounts on top of
motor by ign coil i put socket on it and it broke with a peice still threaded in the intake(DAM) it took 2 hrs vacuuming out
all the peices and using my inspection camera to make sure i got
them all out the intake . got the new one threaded in no leaks!!!

One of the worse jobs I had to tackle on mine was replacing that piece.
 

SunlitComet

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I had a hissing sound under the hood and i found the rubber elbow
that connects the pcv tube to the throttle body and another vacuum
hose was cracked replace them still had the hissing.... the gasket
under the throttle body was bad . I did notice a ruff idle for awhile
now it idles smooth and i will drive it mon. Then wed i decided
to replace the leaking heater hose connector that mounts on top of
motor by ign coil i put socket on it and it broke with a peice still threaded in the intake(DAM) it took 2 hrs vacuuming out
all the peices and using my inspection camera to make sure i got
them all out the intake . got the new one threaded in no leaks!!!

Be gratful it broke instead of destroying the threads unscrewing it.
 

qukon 95

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:angels2:Hey phantom i had that same leak last yr and i know it could have
been worst replacing that heater hose connector
 

Monstar_est87

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That's the heater control valve... Those are notorious for goin bad... Do urself a favor and replace the lines... Those are goin 2 crack next... O and b sure 2 flush out ur heater core i can guarantee its got plenty of crap inside...
 

Phantom240

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Dude, the entire cooling system needs to be cleaned and flushed, if the rusty color of the filler neck is any indicator lol. Replace all those lines and the control valve, throw some DexCool in there afterward and that system should be trouble free for a while.
 

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