Start heating the water and place a cooking thermometer into the water. The wax happens to expand a good bit more because it is changing from a solid to a liquid in addition to expanding from the heat. Thermostat problems are easy to diagnose, and replacement is usually within the bounds of the average mechanic. If the thermostat does not work properly, retrace your steps to see where you made a mistake. And, of course, a shirt you don't mind smudging with grease or oil. If the engine warms up very slowly, or never reaches normal temperature, or if it overheats quickly, the thermostat is probably faulty.
Unhook your coolant reservoir if you can undo it and pour the antifreeze into a container. Wrap all the wires around a pencil. If so, it's very easy to test your thermostat. Whatever your situation, replacing it yourself is a task that is surprisingly simple. The thermostat of a car is not effective in its functioning when you notice that your vehicle overheats shortly after you start the engine or when you see that the temperature gauge, located on the dashboard, hangs below or higher than its regular temperature mark or if it changes erratically. A car thermostat replacement job is within the reach of the average car owner.
You'll find most car thermostats near the top and to one side of the engine—which makes your job easier—and less frequently toward the lower section of the block. So, let's start replacing the thermostat. One in the front and one in the rear. Park the car on a level fround. So your car has been overheating and you've been told to try changing your thermostat, but you don't know where it is.
If you're good with electronics, you can also test the sensor. It comes with many step-by-step procedures for many maintenance, troubleshooting, and replacement tasks that will help you in the future. Their you will find a thermostat housing with the end of the hose attached. If it doesn't open in boiling water, you may be in the clear. Before inserting a new thermostat, use a scraper to remove all traces of the old housing gasket; take great care so that you do not damage the housing. If you can't find the marking, just make sure the spring sensor end faces the engine.
Most replacement thermostats are compatible with all common systems. Some will not start until this button is pushed. You need to remove the entire thermostat -- all you should be left with is exposed wires and a bare wall, nothing else. Then, drill the holes, and screw the replacement wall plate into its new position on the wall. Thermostats wired by non-professionals do not usually adhere to codes, so the colors may not match what they should.
If the hose does not warm much, but the engine soon gets hot, the thermostat has stuck closed. Thus, a car thermostat has a great impact on the longevity and strength of the engine. If in doubt, consult the vehicle repair manual for your particular car make and model. A lost wire will turn this rather easy process into quite the debacle. This, in turn, facilitates the engine to function at an optimal temperature.
If coolant circulates with the engine cold, your thermostat is stuck open. If you're at all in doubt, contact a heating and cooling company. In a few cars the thermostat is housed near the bottom hose. This same technique is used in automatic openers for greenhouse vents and skylights. You want to maximize the life of your thermostat and not have to deal with this again anytime soon. This probably isn't going to hurt the engine, but it will hurt horsepower, torque, fuel economy and possibly emissions. The thermostat in most cars is about 2 inches 5 cm in diameter.
Before installing, apply a light coat of fresh coolant to the seal. Insert the new thermostat then smear the new housing gasket lightly with a non-setting sealing compound. You want yours to match detail for detail. This cylinder holds a wax pellet that melts and then inflates at a certain temperature, which is generally, 180 degrees F or 82 degrees C. Purchase a replacement thermostat that will work with your system. Locating the thermostat In most cars the thermostat is placed under a housing near the water pump on the cylinder head; the housing is connected directly to the top radiator hose.