Radiator fan not coming on when overheating? Is it Fuse or relay?
Honda Civic 2001
My car has been overheating lately. There are no leaks and I noticed the fans don't turn on when the car overheats which I found to be the problem. The fans do work however when I turn on the AC, hot or cold, which lead me to believe my fans were perfectly fine.
What can be wrong I sure hope it's not the fan itself. A mechanic told me to buy the sensor and that it's the problem, but I want some other opinions. I heard it can also be the Fuse or relay. What does it sound like to you guys?
Honda Civic 2001
My car has been overheating lately. There are no leaks and I noticed the fans don't turn on when the car overheats which I found to be the problem. The fans do work however when I turn on the AC, hot or cold, which lead me to believe my fans were perfectly fine.
What can be wrong I sure hope it's not the fan itself. A mechanic told me to buy the sensor and that it's the problem, but I want some other opinions. I heard it can also be the Fuse or relay. What does it sound like to you guys? Been working on cars 33 years. Odds are the first mechanic was right. I've replaced more sensors then fuses and relays for that problem. Replace the sensor. The A/C fan and the cooling fan are run by separate systems on your particular car. If the A/C fan kicks on when you turn the A/C on (like it should), that only means that the A/C fan is fine. The A/C fan kicking on says nothing about the condition of the cooling fan either way.
It's easy enough to test the cooling fan. If you're not sure which fan is the cooling fan, turn the car on, turn the A/C on again and note which fan starts running. Then test the non-running fan for resistance. Unplug the cooling fan and use an ohmmeter to test it (buy, rent, or borrow one if you don't have one). Put one lead on each side of the fan's plug, doesn't matter which is on which. You should get a reading somewhere above 2 ohms. If the reading is below 2 ohms or you get no reading at all, then the fan itself is bad. If the reading is above 2 ohms, then and only then would I'd suspect another problem causing the fan to not operate. Good luck. It could be a fuse or the fan motor may be bad.
The A/C fan and the cooling fan are run by separate systems on your particular car. If the A/C fan kicks on when you turn the A/C on (like it should), that only means that the A/C fan is fine. The A/C fan kicking on says nothing about the condition of the cooling fan either way.
It's easy enough to test the cooling fan. If you're not sure which fan is the cooling fan, turn the car on, turn the A/C on again and note which fan starts running. Then test the non-running fan for resistance. Unplug the cooling fan and use an ohmmeter to test it (buy, rent, or borrow one if you don't have one). Put one lead on each side of the fan's plug, doesn't matter which is on which. You should get a reading somewhere above 2 ohms. If the reading is below 2 ohms or you get no reading at all, then the fan itself is bad. If the reading is above 2 ohms, then and only then would I'd suspect another problem causing the fan to not operate.
It could be a fuse or the fan motor may be bad.
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