One of which is when the thermostat is seized or stuck closed, which is very common. This prevents the liquid in your engine from flowing into your radiator and your Honda Civic will overheat. Another one of the more common problems with the thermostat is when it sticks OPEN. Because it fails to close or seal, your Civic engine will never properly warm up which can cause even more problems. If you are not sure what lean or rich conditions are, check out our primer on closed loop operation and how it affects your gas mileage.
If you need help servicing or replacing your Honda Civic thermostat, you can use this handy guide to get the job done. The first order of business is of course to secure the vehicle, and drain the car of coolant. Make sure to dispose of the coolant properly and follow all the safety guidelines whenever you are working on your Civic. Once you have the coolant drained from your engine, you can begin our how to guide on how to replace a Honda Civic thermostat.
The thermostat housing on your Honda Civic is located behind the distributor and mounted just above the starter. When the coolant is drained from your vehicle, go ahead and disconnect the engine coolant temperature sensor as shown. Remove the 10mm bolt there and disconnect the grounds now, and you can now access the two 10mm bolts that hold the upper half of the thermostat housing in place.
Now that these grounds are removed, you can begin removing the two 10mm bolts that hold the upper housing. Once you have these 2 bolts taken out, can you pull off the thermostat housing, you can leave the radiator hose connected. Now you can yank out that old Honda Civic thermostat, and you can begin prepping the thermostat housings for the re-installation process.
Now that you have the old unit removed, you must thoroughly dry the lower and upper halves of the housing. Use Hondabond or high-temp RTV silicone gasket maker once both surfaces are dry. Prepare your new thermostat using the rubber isolator, and rub the gasket maker or Honda bond until it gets tacky.
Gently reinstall your new thermostat and use both 10mm bolts to secure the housings in place. You are now done with your new thermostat installation, make sure to allow your gasket maker to dry and cure before pouring new coolant in.
Trace the upper radiator hose to the housing to verify the coolant level. Tighten the radiator drain plug. Remove the drain pan and dispose of the coolant properly.
Loosen the hose clamp from the thermostat housing with a screwdriver and remove the hose. Remove the three bolts securing the housing with a wrench.
Remove and discard the thermostat. Clean the housing of any gasket remnants with a putty knife. Insert the new thermostat into the housing.
Place the new gasket provided with the thermostat on the housing cover. Replace the housing cover and secure the three bolts. Torque the bolts to 7 pound-feet with your torque wrench. Install the hose on the thermostat housing. Tighten the hose clamp to avoid coolant leaks. Add coolant to the radiator until the level is full.
Replace the radiator cap. Test-run the engine. Check for coolant leaks while the engine is running.
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