2003 to 2007 duramax engine thermostat change
In this how-to, I'll walk you through the steps necessary to change duramax engine thermostat.
This how-to assumes you have already secured the truck by disconecting both battery.
Remember, when you replace coolant parts, always let cool the car/truck and open radiator cap to let pressure goes out
TOOLS/MATERIALS REQUIRED:
-12mm 3/8drive short socket
-3/8 impact gun (optional)
-3/8 box joint
-10 inch long 3/8 extension bar
ESTIMATED TIME ON COOLED TRUCK :
-30minutes
STEP 1
Locate thermostat housing ( between oil filler neck and a/c compressor
STEP 2
Open the drain valve at the bottom of the rad to drain about 1 gallon
STEP 3
Disconect the electronic plug behind a/c compressor
STEP 4
Remove connectors bracket (2 bolts ) to reach the hidden bolt of the upper rad hose bracket
Remove the 2 bolts of the rad hose braket
STEP 5
Remove 4 bolts on top of thermostat housing
Lift housing and change both thermostat
85°c near fan and 82°c rear ( closer to coil dash)
be careful to remove older rubber gasket
STEP 6
Redo all step from 5 to 1
Refill coolant
Check for leaks
