Radiator fan

[SilverEclipse96]

What would cause my radiator fan to turn on till around 216f?? Faulty thermo switch?

AC has been deleted including the ac fuse box.

 

[1990AWD]

that's the first thing I would check. get the car up to temperature and check if you have continuity through the thermo switch. my fan kicks in at around 203* btw.

 

[DSM pHrEaK]

You can check those temperature sensors using an ohm meter and a cigarette lighter off the car. Just connect the ohm meter to the two pins and if you read no resistance that parts alright. Then resistance should climb as you heat the end of the sensor (brass part)....not real accurate but if you get erratic readings then you know something's up.

 

[luv2rallye]

You can check those temperature sensors using an ohm meter and a cigarette lighter off the car. Just connect the ohm meter to the two pins and if you read no resistance that parts alright. Then resistance should climb as you heat the end of the sensor (brass part)....not real accurate but if you get erratic readings then you know something's up.

First of all his 1g fan is controlled by a thermo switch (at bottom of radiator), not a sensor. So there's infinite resistance (open circuit) until the turn on temp (185F) at which time it becomes a closed circuit with zero resistance. Second, temp sensors decrease resistance with heat, not increase.