Question about 2005 Hummer H2

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2005 H2 SUT problems

I have a 2005 H2 SUT modified...magnuson supercharger. The serpentine belts break and the rebuilt transmission overheats. The transmission was rebuilt to handle the extra torque, why is this happening? Help me please!!!
This Hummer has 6" lift (Bullet Proof) with 40" tires. The engine also gets hot....is this because of the supercharger? What can I do?
Because I am a girl...mechanics see me coming and I swear they yell "quick, take her money and run" LOL...kidding or not, that is how I feel...they take me for stupid and all I am getting is the run around.

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How often is the belt breaking? excess revolutions can cause premature wear. flushing the cooling system with the proper cleaners, refilling with dexcool and DISTILLED water can reduce the engine temp in h1's by at least 10 degrees in the desert. this i have done. also if the cooler for the transmission has not been upgraded to handle the new trans you will still get an overheat. you can also put a electric fan on the trans cooler. the belt may not be aligned properly.

Posted on Nov 02, 2009

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Never heard of the 200,000 repair shops available,with better
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Since nothing is flowing through the engine or radiator, the engine will quickly overheat. Since your engine oil also does a bit of cooling as well as lubrication, oil passing through the overheated block will break down and overheat as well. Hopefully the light came on for that before any internal bearing damage was done. Smoke was due to the overheat.
Your serpentine belt likely is not covered under a warranty, especially after four years.
Hopefully the problem is isolated to just the belt but I do recommend that if you have an automatic transmission you change the fluid in that even if you are not at the change interval recommended. Trans oil is cooled by the cooling system and a severe overheat can chemically change it. Doing a change now will avoid any overheat related trans failure. Since you can't remove all the trans fluid (at best during a change you only remove half) so I recommend using a bottle of lucas trans additive to bolster the remaining fluid.
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Hello! I'm not sure if you have the supercharged, or non-supercharged version of the 3.8 liter V6 - so I've posted both for you.

Supercharged L67 motor - Supercharger belt:



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Supercharged L67 motor - Accessory drive belt:

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Non-Supercharged L36 motor:


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Hope this helps, and thanks for using FixYa!

-KCGTODAD

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