Thermostats
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How do you replace the thermostat located on a 1999 Lexus rx300?

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Wiki User
2010-01-22 01:37:43
2010-01-22 01:37:43

the thermostat is under the air assembly,monted onto the cylinder head.there are three screws holding the thermostat,remove screws,dissconnet the housing and pull the thermostat out.Assembly is the reverse steps

In addition to the above, you need to pull out the aluminum tube that slides into the back of the housing and change the large o-ring. This will also aid in pulling out the thermostat housing. Remove the hose clamp, hose and 13mm bolt on the bracket supporting the tube going into the thermostat housing. Remove the 3 10mm nuts holding the housing and remove the thermostat.

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