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The oil cooler in these trucks have leaked coolant when subjected to cooling system over-pressure, like due to a bad head gasket. Gasket/seals...

A couple of the block drain plugs are inaccessible without more disassembly (i.e. remove starter on passenger side or other stuff on driver's side)....

When the model year change happened in late 2005 GM was running an "employee pricing for all" promotion. Coincidentally, when it ended the "real"...

Also, your VIN 8th digit should be either 2 or D, for 2006. 2 is early, D is late. (I have no idea what is E) They are essentially the same...

thxs DmaxMaverick

If you're leaking fuel into the valley under pressure, it certainly could be the IP weep hole (inner input shaft seal). It can allow the return...

Years ago I talked to John Kennedy about ordering a fuel gauge. Those pressures you are seeing are what he told me to expect from a 6.5

Thank you for the response! The situation continues to develop. I pulled the intake and determined that the lines and FFM are all good. I am quite...

That's not a leak. That's a nuisance not worthy of all that Youtube nonsense. Probably wouldn't stain a driveway. I suggest Cadillac tabs (Amazon,...

The leak is intermittent, maybe a tablespoon, it went for weeks without leaking, and I thought I had it.. heres my vin: 1GCHK39E188360

How much is it leaking? If it isn't much, I might try some Cadillac tabs before going through all that. GM/ACD part # 12378255/10-108. That video...

found my issue..and this is way over my ability to fix..so Ill be getting a mechanic to do the job https://www.youtube.com/watch?v=auMUMj8hvsE

I think we're chasing either more than one issue, or misreading symptoms. You have a 1995 model, which is unique in a few respects. One is, you can...

thanks

Spongebob do you have the Duramax book published here from TDP? Page 11 says GM thoughtfully placed drain plugs behind the starter and other...

I did a search for a Duramax 2006 but I'd have to crawl under mine to see if it matches

Yeah figured that would be the way, but is that a Duramax?

Maybe this https://www.youtube.com/shorts/FXHhmKRksNM

The trans in my '95 would go into limp mode. Dealer rebuilt the trans on warranty. Finally, a new ignition switch cured it...

yes right now Im at 0 degree safe........ we got 70" of snow last winter.... I would give up a portion of my virginity to get all 6 gallons out so...

My 98 3500 6.5 5 speed,tow truck always had electrical issues till i replaced the ignition switch. Not saying that is the issue, but sometimes the...

Do you have a tester to see how cold its good to? Or is that the 0* your referring to? Drain a gallon and add back 1 gal of pure coolant? Then...

Still acting up and making me crazy. Left it parked up hill for 2 days and would not start today with out priming. I took the lift pump off and...