Rick_Leuce
Registered User
HI all,
The radiator fan on my 1991 SC does not turn on when the car is up to temperature. I tested the fan motor by connecting it directly to the battery, and it comes on. I replaced the temperature sensor that connects to the IRCM Cooling Fan Relay. I tested it by letting the car idle in the driveway until the engine heated up past the "M" in "NORM" on the temperature gauge, the fan still would not come on. I turned the A/C to full blast (which I hear is supposed to make the fan come on, even if the engine isn't up to temperature) but the radiator fan still would not come on.
I checked all of the fuses and replaced the IRCM relay with both a used one that was from a 1990 Thunderbird SC as well as a brand new one off of the internet, the fan still won't come on when the engine gets hot. The fan WILL come on if I unplug the cooling sensor, it will run at full blast as long as the car is started. However, the car will not start when warm if the sensor is unplugged (such as right after fueling up at a gas station). So starting the car as is, requires plugging the sensor (to start the car) and before leaving, unplugging it back in so that the cooling fan will work. The car can however start with the sensor unplugged if it hasn't been running for a few hours.
Assuming that the IRCM and Fan motor are fine, I was wondering what else I should check/replace to get the fan to come on as it's supposed to.
The radiator fan on my 1991 SC does not turn on when the car is up to temperature. I tested the fan motor by connecting it directly to the battery, and it comes on. I replaced the temperature sensor that connects to the IRCM Cooling Fan Relay. I tested it by letting the car idle in the driveway until the engine heated up past the "M" in "NORM" on the temperature gauge, the fan still would not come on. I turned the A/C to full blast (which I hear is supposed to make the fan come on, even if the engine isn't up to temperature) but the radiator fan still would not come on.
I checked all of the fuses and replaced the IRCM relay with both a used one that was from a 1990 Thunderbird SC as well as a brand new one off of the internet, the fan still won't come on when the engine gets hot. The fan WILL come on if I unplug the cooling sensor, it will run at full blast as long as the car is started. However, the car will not start when warm if the sensor is unplugged (such as right after fueling up at a gas station). So starting the car as is, requires plugging the sensor (to start the car) and before leaving, unplugging it back in so that the cooling fan will work. The car can however start with the sensor unplugged if it hasn't been running for a few hours.
Assuming that the IRCM and Fan motor are fine, I was wondering what else I should check/replace to get the fan to come on as it's supposed to.