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Preparing Your Hummer H1 for Winter:
I did a search on the board for winterizing and cold weather. Here is a quick list of what I should consider:
Currently I am using Opti-lube Diesel Fuel Improver www.opti-lube.com/XPD.htm
A few comments on your list:
If it's cool in the morning and after the glow-plug cycle, and you start your truck easily and there isn't any white smoke, or none after the first puff, yours are probably okay.
If you want, you can check your glow plugs fairly easily with a ohm meter - your looking for a few ohms of resistance, plug tip to block/ground. If you need to replace them, the 60G's will be a nice upgrade from the plugs that came in your truck - just don't forget to anti-seize the threads.
The controller generally doesn't go bad - wouldn't waste the money.
Battery blanket if it's going to be outside in sub-zero temps. Wouldn't bother otherwise.
Synthetics are smart - and you can use them everywhere.
Finally the block-heater is to my knowledge standard. It's installed on the leftside of the engine block in the 2nd freeze plug hole forward from the rear. The cord end usually dangles from the left-front frame rail near and below where the hood attaches. It's got a cover over the 3-prong plug and it's black in color. You can see the block heater in the freeze plug easily from under the truck. Perhaps your cord is just missing.
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