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I am trying to figure out why my 1996 Toyota Avalon is overheating and thought first the thermostat was the likely culprit. But this is a little more complicated to find than I expected..
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check the installation of the thermostat
the body of the thermostat has to face the head or block as it requires hot water to make it open
installed incorrectly will cause over heating
Did you also change the thermostat while you were doing the rad? The thermostat is the most common cause of engine overheating, it should be changed every couple years whether it is acting up or not.
Is the fan coming on? If not, possible lower radiator fan switch/sensor? No leaks... So overflow tanks level stays stable? How do you know it is overheating? Elevated temp guage? Engine smells overheated? Both? We need more info.
try resetting the computer which involves unhooking the battery for about 15 minutes. if you have an anti-theft radio make sure you know the code and how to enter it.
Make sure the electric cooling fans are coming on. If they are, you could have a bad thermostat and gasket. If the fans aren't coming on, you probably have a bad coolant temp sensor. Also, check your fuses, if the fans aren't coming on.
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