This is a step-by-step DIY video tutorial guide on how to remove engine coolant thermostat on 2003-2007 Honda Accord 2.4L (which include model DX LX EX year 2004, 2005 & 2006) and should be similar to other Acura or Honda models such as Civic, CRV, Element, Odyssey & Pilot, by young mechanic Aiman.
To remove thermostat:
Disconnect the negative battery cable.
Drain the engine coolant into a sealable container, to a level below the thermostat.
Use a pair of pliers to release the tension from the hose clamp, then disconnect the hose from the thermostat housing.
Remove the fasteners from the thermostat housing, remove the housing, then remove the thermostat.
Installation is just the reverse of removal, make sure to replace gasket or o-ring if necessary.
What Does a Car Thermostat Do?
The thermostat is responsible for controlling the flow of the engine coolant as it circulates through the engine block. When the engine is cold, coolant does not flow. Once the engine warms up, the thermostat opens, circulating coolant to keep it at optimum operating temperature.
When it comes to your car thermostat, it actually falls outside of the routine maintenance category. The thermostat in your vehicle will most likely not wear out or become less effective over time due to normal driving. Your thermostat is a pretty simple piece of equipment with a pretty simple job. Your thermostat is a valve on your vehicle’s cooling system which regulates how much of the coolant gets recirculated straight back into the engine and how much gets sent out through your radiator to be cooled before it recirculates through your engine. By modulating how much coolant gets sent through the radiator, the thermostat can keep the temperature of the coolant in your engine in a very specific range no matter how warm or cold it is outside. This specific temperature range is the range your engine is designed to operate most efficiently in, getting the maximum power without overheating and damaging any parts. This is usually about 1800F to 2000F.
A car thermostat opens and closes through the use of a bimetallic spring, a wax piston or other thermally controlled device. In a bimetallic spring, there are two different types of metal bonded together. These two types of metal expand at a different rate when they are heated, so as the engine coolant warms up the two metals expand, one to a different length than the other. This causes the spring to straighten which pushes the valve open. Similarly in a wax cylinder there is a wax that melts right around the temperature your engine should operate. When the wax melts, it expands pushing on the cylinder which moves and opens the valve.
Both of these mechanisms are so simple that there is very little to break, change, or go wrong. There are however some situations where you need to replace the thermostat in your vehicle. If your car ever overheats, it could cause damage to your thermostat. Every vehicle has a temperature gauge to help you make sure your vehicle’s engine is operating in the proper temperature range. If the temperature gauge ever gets more than ¾ of the way up its range, or reaches the red line, you have probably done damage to your thermostat. High temperatures can ruin the bonding on the bimetallic spring or change the properties of the wax cylinder so your thermostat won’t open at the specified temperature it is supposed to.
If you want to know how to test or diagnose your thermostat to see if it working, bad or faulty, please watch the following video: https://youtu.be/DiQqKmXE-04
Disclaimer of Liability (No Responsibility): Please exercise due diligence with information obtained from this video. The information contained in this video is for entertainment purposes and should only be treated as such. I shall not be held liable for any damage to vehicles, tools, equipment or person resulted therein. This channel assumes no liability for property damage or injury incurred. You will use such information at your own risk. Aiman recommends safe practices when working with power tools, automotive lifts, lifting tools, jack stands, electrical equipment, blunt instruments, chemicals, lubricants, or any other tools or equipment seen or implied in this video. Any injury, damage or loss resulted from using information in this video is the sole responsibility of the user and not EyeOnAiman.
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