is the leading Chevy Silverado resource for technical guides. The thermostat is a simple device that detects coolant temperatures and opens or closes a passage to the radiator. For the full step-by-step article, please visit
This passage remains open as long as the coolant is above the thermostat’s rated temperature. Since thermostats wear over time and its internal seals begin to deteriorate, the result is poor engine cooling. If the thermostat in your Chevy Silverado stops working, watch the following steps for a comprehensive DIY replacement.
Replacing the thermostat and housing in your Silverado will take two to three hours to complete. The difficulty is moderate since it requires working in areas with limited accessibility. Compared to what a pro shop or the dealer would charge you for this repair, forty to sixty dollars to do-it-yourself is a steal.
The supplies you’ll need are: a new thermostat, a flat head screwdriver, 10 millimeter socket, a ratchet, a catch pan, pliers, pry bar, sand paper, and coolant.
Step 1 – Drain the Coolant
Remove the coolant overflow bottle cap.
Go behind or under the driver side front wheel.
Near the bottom corner of the radiator is a thumb screw that is the radiator drain.
Remove that and let the fluid run into the catch pan.
Step 2 – Remove Air Intake Duct
Loosen up these hose clamps with a flathead screwdriver.
Pull both ends of the intake hose out. To remove it, just lift it up and out.
Step 3 – Disconnect Lower Radiator Hose
Using pliers, push the two teeth together on this hose clamp.
Next, slide the clamp up the hose.
Using the pry bar, pry the hose free. Pull back on it with the pry bar and pull on the hose with your other hand at the same time to get it out.
Step 4 – Remove the Thermostat
Remove this 10 millimeter bolt and the matching bolt on the bottom of the thermostat.
Pull out on the thermostat, making sure to have the catch pan underneath first.
Then pull the thermostat out the rest of the way.
Step 5 – Install New Thermostat and Housing
Use the fine grit sandpaper to clean up any corrosion on the housing. Then clean up any debris left behind really well.
Take the new thermostat and feed it down into place.
Then replace the two 10 millimeter bolts. Tighten them to about 15 to 17 foot pounds.
Push the hose back into place.
Then slide the hose clamp back down.
Take the intake hose and feed it back down into place.
The hose needs to go underneath the radiator hose.
Once they’re both into place, push this hose back up and in. It will clip onto the side.
Tighten up these two clamps with the flathead screwdriver.
Replace the coolant to the max fill line.
Start the vehicle and let it warm. Then check where the coolant level is, and refill if necessary.