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Discussion Starter · #1 ·
Hey guys, I'm new to this forum and I'm looking for some help. I can't get the cooling fans to come on on my 2006 IS 250. My A.C also stopped working around the same time this happened. I've checked the thermostat, coolant temperature sensor and the 3 fan relays. They are all good. But when I unplugged the coolant temperature sensor the fans came on and stayed on no matter what temp the car was or if the A.C was on. I checked the resistance on the sensor and it is changing with the temperature rise. Still with it plugged back in the radiator fans will not come on. Also, the heat on the passenger side gets significantly warmer than on the driver's side. Any help would be appreciated.
 

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You need to look and see if the clutch on it is engaging. If it is not. There is another reason why the fans are not on with the A/C.
 

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Discussion Starter · #5 ·
The clutch does not engage when I turn the A.C on and the pulley turns freely when the engine is off
 

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That means the A/C system is not working, So no fans. Find out why the A/C system is not cutting on.
 

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Discussion Starter · #7 ·
Do you have any recommendations on how to check the A.C? I've never done that before.
 

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If you have not done this stuff before. It may be better to take it to a mechanic. I could tell you a few things. But you can damage more if not careful.
 

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Discussion Starter · #9 ·
I understand it might be difficult, but if it's not too much trouble I'd like to give it a try. Any help would be great.
 

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Okay, Get or rent some A/c gauges and check the pressure. If it has pressure try temporarily bypass the pressure switch. If still nothing Try powering the A/C clutch manually. Start with that.
 

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Discussion Starter · #11 ·
I appreciate your help Solar Yellow. I found the problem. The heat exchanger for the transmission was blocked solid with precipitate from the coolant. Seems the previous owner mixed two types of coolant in the car. While I was pulling the transmission I was able to clear the blockage and now all is good.
 
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