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Discussion Starter · #1 ·
Any help out would be greatly appreciated. I have a 2017 cla250. The fan runs when I use the scanner to test it. But it won’t run when reaching hot temperatures. It won’t run when the defrost or temp blower is running or with A/c. I’m not getting any coolant temp codes or faulty fan codes.
 

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...The fan runs when I use the scanner to test it....
.................
Welcome to the CLA Forum Ed :)
We'll see if the members can give you some clues...When you conducted your scan, what were the codes?
 

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Discussion Starter · #6 ·
I can turn the fan on with the XENTRY program so I have power going to the fan no problem. It just run on it’s on , won’t kick on with temperature or when turning on the defroster or a/c
 

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Or check the temp sensor?
If you can activate in xentry then it may be the sensor circuit not triggering
 

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I can turn the fan on with the XENTRY programie so I have power going to the fan no problem. It just run on it’s on , won’t kick on with temperature or when turning on the defroster or a/c
Hello you solved problem Becouse i have the same isue :/
 

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Or check the temp sensor?
If you can activate in xentry then it may be the sensor circuit not triggering
I agree, it's potentially the temp sensor, as power is still going to the fan.
 

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Any help out would be greatly appreciated. I have a 2017 cla250. The fan runs when I use the scanner to test it. But it won’t run when reaching hot temperatures. It won’t run when the defrost or temp blower is running or with A/c. I’m not getting any coolant temp codes or faulty fan codes.
Can you activate both slow and high speed fans on scanner sounds like skow speed fan bit working
 
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