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Does a gmc sierra 2004 block heater heat the coolant or the oil?
Wiki User
∙ 15y ago
It warms the coolant. The block heater screws into the side of the block right above the oil filter. It takes a 17 mm hex socket to remove the factory brass " plug ". This is not a freeze plug but a threaded hole just for this application. It takes a 24 mm regular socket to install the gm oem heater. If you have a 4x4 it is easier to drop the front drive shaft out of the way to install the heater. The drive shaft uses 11mm bolts. You will loose about 2 gallons of dex cool when you do this job if you don't drain the system before hand. '
Wiki User
∙ 15y ago
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