Then the screws holding it in should be visible. Follow the upper radiator hose from the radiator back to the engine. You will lose coolant so try to swap it out quick or drain some of the coolant out. Look for a housing at that location, which is usually held on with 2 bolts. More than likely it will be knocked loose while trying to position the thermostat housing.
Remove any corrosion from the knuckle where the hubs mating surfaces are. Because the lower bolt goes into a slot and because it is longer then the original bolt you can actually work the thermostat housing against the exhaust heat shield and over the thermostat that is sticking out of the housing and slid the slot onto the lower bolt. Should be the same as with most vehicles Located in the removable housing at the engine end of the upper radiator hose. You will notice that the housing has one hole for the upper bolt and a slot for the lower bolt. Then apply a thin coat of gasket sealant to both sides of the new gasket and place it in position on the intake manifold. Note the position of the thermostat before removing it.
Lastly, fill the radiator with fresh coolant. Let run till bubbles no longer come out then top off coolant. There are 2 15mm bolts that hold the starter in, one you access in front of the frame rail, the other from behind the frame rail. I tried to start the demon capscrew first before positioning housing but it only got in the way. Fill with coolant and leave rad cap off for 15 minutes to bleed air out and top off the coolant. They have the procedure and the books are cheap.
The housing should be held on by two bolts. Tap gently to remove the outlet. There also will be a strap under the dash holding up the back end. If this is the problem, the actuator is inside the venting behind the control panel and is difficult to get to but is possible. You will need a long handle closed wrench.
The Thermostat is located at the base of the tube that goes into the engine. Drain a gallon of coolant or so and pop the hose off of the housing. I hope this helps you. Also check the tension on the water pump drive belt. Underneath that cover is the thermostat. Unbolt the two bolts to change it out. You can't tighten the capscrew to get your wrench back! Remove the 2 or 3 bolts on water outlet housing.
But as long lasting as their vehicles are, it's up to you to maintain them once they're off the assembly line. Follow the upper radiator hose to the thermostat housing. The thermostat in a Buick motor is a valve that controls the flow of water between the engine and radiator. Or do you think it is something else? Once both bolts have been removed you can pull off the thermostat housing. Add coolant, keep rad cap off for 20 minutes to bleed out air and fill with coolant.
Once normal temperature is reached, the thermostat opens and allows coolant to circulate through the engine. The length isn't going to matter because the bolt goes all the way through the mount. Mark Remove the wheel, brake caliper and bracket and the brake rotor. When you take out the two bolt for the thermostat housing the thermostat sits under the housing. Snug bolts evenly to avoid cracking the housing. I cut the ring to fit snugly just cut it, fit it into the groove, then cut off the excess.
If the engine is running too hot, carefully place your hand on the upper radiator hose. Any rust between the rotor to hub mating surface will cause a brake pulsation down the road!. . I replaced mine with a length of heater hose. Check the coolant level in the radiator. Should look like a cast metal elbow. Installation is just the reverse, and be careful you don't get the bolts tootight.