He disconnected something under the hood and now when i turn the key there is no sound
He probably disconnected the battery. look for any wires that aren't hooked up.....don't tell him i told you.
SOURCE: 03 hummer turns off when on a redlight or when it
Check your air intake if this is loose or getting to much air to make it run too lean it will cause the engine to hesitate or stall.
Also check the MAF Sensor on the air intake it could be going bad so it is an easy fix if this is the problem.
PS never use carb cleaner or wd40 to clean the air intake.. You can buy MAF Sensor cleaner at Auto Zone or Checker Auto Parts stores.
I hope this helps you a little bit.
SOURCE: 2007 Hummer H3T...I noticed a
Pretty likely you have a pin hole leak in the radiator core or in a nearby hose. Air flow from driving or form the fan blowing will spread the coolant all over under the hood. Best way to find its source is by pressure testing the system with the engine off so nothing blows around. Sometimes you can do the same thing by running it up to operating temp, shutting it off and letting it sit a minute or two so pressure increases. Sometimes, depending on where the leak is, you won't be able to see it but will see the coolant escaping. If you see coolant coming out anywhere in the area of the radiator, there is nothing else there that can be leaking....therefore it's a safe bet that your leak is in the radiator. In that case, remove it and have a radiator shop look at it and advise you on the best repair options.
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