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Re: over heating
The thermostat do not turn on the fans, it's a temperature controlled valve, so control the flow of coolant.
A temperature sensor tell the ECM what the coolant temperature is. Then the ECM turn on a relay, which then turn on the fan.
What you need to find out is: what is the problem: lack of coolant flow (blocked radiator or failed thermostat for example) or lack of air flow (fan not working, radiator air passage blocked by dirt...)
Also, what make you say it overheat? boiling coolant? high temperature gauge reading? warning light on the dash?
If it's a lack of airflow, it mean that something between the ECU and the fan blades is dieing. Possibly the fan or the relay. Could also be a wiring issue, but those tend to cause more problems, as in never turning on or blowing fuses...
As for that relay... it appear to be well hidden... Suposelly it is located "center front of dash, on relay bracket"
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