SECTION 1: POWERSTAT INSTALLATION
Tools and supplies required
8mm socket and ratchet
1/4” flathead screwdriver
DEX-COOL anti-freeze coolant
(GM part #1234-6290)
Part #1008 - 160° PowerStat
Part #1022 - 180° PowerStat
1.
See Figures A or B. Disconnect the intake air temperature sensor
connector located in the air intake duct between the mass air
flow sensor and the throttle body.
2. Use a flathead screwdriver to loosen the clamps on the air
intake duct and remove the duct.
3. With the radiator cap on, remove the two (2) thermostat
housing bolts. Remove the thermostat housing leaving the
radiator hose attached to expose the stock thermostat. A small
amount of coolant may be lost at this point.
4. Lift out the stock thermostat. Use a screwdriver to gently pry,
if necessary. Clean all the sealing surfaces.
5. Make sure that the rubber “O” ring is positioned flat side
down on the PowerStat. Next, install the PowerStat, making
sure that it’s positioned correctly (spring end facing down into
intake manifold).
6. Reinstall the thermostat housing and bolts. Torque the bolts to
7ft.-lbs.
7. Remove the radiator cap (or coolant reservoir cap on
Corvette). Place a rag or towel under the pressure side bleed
screw on the thermostat housing to prevent coolant from
splashing on the distributor. Open the pressure side bleed
screw while watching the coolant level in the radiator (or
coolant reservoir on Corvette). The coolant level will drop
when the bleed screw is fully opened.
8. Slowly fill the radiator with the DEX-COOL coolant. Close
the bleed screw when the bubbles disappear and only coolant
is escaping from the bleed screw. At this point, finish filling
the radiator and reinstall the radiator cap.
IMPORTANT:
NEVER MIX ORDINARY ANTI-FREEZE (GREEN)
WITH THE DEX-COOL ANTI-FREEZE (ORANGE)
OR YOU MAY DAMAGE THE COOLING SYSTEM.
4
•
WARNING: NEVER ATTEMPT TO CHANGE
A THERMOSTAT ON A HOT ENGINE
•
SERIOUS INJURY CAN OCCUR IF THE
RADIATOR CAP IS REMOVED WHILE THE
COOLING SYSTEM IS HOT
•
THE ENGINE SHOULD ALWAYS BE COLD
WHEN INSTALLING THE POWERSTAT
NOTE: After installing the
PowerStat, if any coolant
needs to be added to the
vehicle, make sure you
put the same color coolant
back into the vehicle. If
your vehicle has orange
coolant, replace with orange
coolant. If green, replace
with green.
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