SOURCE: 2006 Chevy Uplander no heat. Coolant is full and
theres some kind of blockage in the hoses do a flush of the system.
SOURCE: Drain Engine Coolant in 2005 Chevy Silverado 2500 HD
there is a petcock at the bottom of the rad drain ti from there and use a antifreeze tester to check protection temp
SOURCE: I can't find the thermostat location on a 2005
the thermostat is under the throttle body
remove the air box and the throttle body
remove the top thermostat bolt
the bottom thermostat bolt remove 95% the hole is slotted
replace thr t-stat and reassemble
IMPORTANT
if you have anLX9 engine there will be air bleed scews
if you have an LZ9 it will not have air bleed screws
ok if you have bleed screws open both then fill the rad wait till a STEADY STREAM of coolant is coming out then close bleed screws
start the vehicle put your heater on HOT and VENT AND BLOWER ON HIGH
run vehicle till u get HOT NOT WARM AIR coming out of vents this will insure you have no air in the cooling system
now if you have no bleeders
then fill the rad then install the rad cap
start the engine run engine 2,000-2,500 RPM till the temp. gauge reads about normal about half way
then let the vehicle idle for 3 min
then shut the vehicle off and cool down so the rad cap can be removed
SAFELY
top up coolant
also make sure there is good hot air coming out of the heater if not repeat procedure there is still air in the cooling system
hope you found this helpfull
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