When I turn the Igition to ON, the thermostat needle goes all the way up. This also happens reguardless of what the temperture is. I checked the resistance of the coolant temperture sensor according to the TSRM and it looked withing range. I also check the voltage output and I got about 5 volts. I checked my engine error code and I have no errors. Anyone might know how to solved this problem? Please help.