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My parents had the same problem with the dash lights on there Montana. After 7 trips into the shop we determined ourselves that there is a wiring harness that runs under the carpet on the drivers side in about the location where most people rest their left foot when driving. What was happening is the wires had worn through the insulated cover and was grounding out on the bare floor under the carpet. We were able to tape the wires and wrap them with hockey stick tape to prevent it from happening again. It is worth looking into.
This requires that you know the numerical code number for the radio. I'm guessing that you don't. If you have any of the documentation that came with the car, you may find it written down somewhere. If not, you may have to check with your local GM dealership for help. Another option, however, is to check Ebay. There are sellers there who will sell you the information on how to unlock your radio. For what it's worth, I used one of those sellers to find instructions on how to reprogram my key fob. It worked and only cost me $10. It's worth a look.
There are a few ways to doing this, and it takes time and a few band aids. You can remove the alternator to give you some room to access the rear spark plug with an extension and swivel spark plug socket. You can also get to the plugs from under neath if you have a ramp and long arm, an extension and swivel spark plug socket will help. You may have to use a 2x4 to wedge the engine to give you some room if you have larger arms. The other way is to tilt the engine forward by disconnecting the two top engine mounts. First replace the 3 front plugs and wire one at a time so you don't cross them. After you have changed the front plugs have a friend help you. Make sure the parking brakes are on and disconnect the two top engine mounts, release the parking brakes and let the transmission in park. Push the van forward slowly to tilt the engine forward far enough to give you room with out pushing it to far in to the radiator. Put the parking brakes on again to keep the van from rolling back and place a block of wood behind and in front of the rear wheels. Don't want to lose an arm. Replace the rear plugs with extensions and a swivel spark plug socket. Note, your going to have to replace the spark plug wire since the rear ones are really hard to remove and pulling on then will destroy them, not worth the headache trying to save them. Use platinum plugs so you can get 100.000 miles before you have to change them again so use anti-seize on the plugs so you can remove them again. Good luck and hope this helps, I personally go from under the van.
Bad News. I recently had the same type of smell ( no leaks or puddles either) coming from my van and had to have the intake manifold gasket replaced due to the Dex-cool issue. It appears GM installed an inadequate/substandard gasket when they built the van. My van only had 65,000 miles on it. There's a Dex-cool settlement you could have applied for but repairs had to be made by May of 2008.
This is the only real complaint I've had with the van.
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