banderso
NAXJA Forum User
- Location
- Stockbridge, MI
Recently I needed to replace the thermostat in my '91. The top bolt in the thermostat housing was seized and I was afraid it would break off in the head, so I took it to a shop. They were able to heat the bolt and get it out without breaking it, but apparently they didn't take the coolant temp sensor out of the thermostat housing before applying the heat. When I drove the Jeep home I got a check engine light (code 22 - coolant temp sensor out of range) and the electric fan was running constantly. It turns out they fried the coolant temp sensor and it was leaking water into the connection. I replaced the sensor.
I assumed I had fixed the problem until I took it for a drive today and noticed that the electric fan is not kicking on when it should. The fan turns on when I turn the A/C on or if I unplug the coolant temp sensor, but if I let it idle the engine temp will come up and the fan will not come on.
This seems to point to the sensor being bad, but it is brand new. Anything else that could be the culprit? Is there a way I can more definitively test the sensor? Thanks.
I assumed I had fixed the problem until I took it for a drive today and noticed that the electric fan is not kicking on when it should. The fan turns on when I turn the A/C on or if I unplug the coolant temp sensor, but if I let it idle the engine temp will come up and the fan will not come on.
This seems to point to the sensor being bad, but it is brand new. Anything else that could be the culprit? Is there a way I can more definitively test the sensor? Thanks.