2004 Trailblazer 4.2

External Since: Jan 02, 2008 Posts: 1

Is there a coolant block drain on 2004, 4.2L, Trailblazer? I can't seem to
locate one. If not, how does one drain coolant from the block - by
thermostat removal? If I have to remove the thermostat, it appears I have
to remove the P/S pump to access the thermostat bolts. Is that correct?
Any and all information is greatly appreciated.

External Since: Jul 27, 2006 Posts: 464

Remove the lower hose from the radiator, best bet if no block plugs.
"TOM TAYLOR" wrote in message

> Is there a coolant block drain on 2004, 4.2L, Trailblazer? I can't seem
> to locate one. If not, how does one drain coolant from the block - by
> thermostat removal? If I have to remove the thermostat, it appears I have
> to remove the P/S pump to access the thermostat bolts. Is that correct?
> Any and all information is greatly appreciated.
>