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  #1  
Old 06-06-2018, 12:06 PM
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A/C condenser fan not switching on

1984 300CD US.
I notice that the fan isn't switching on even when it is very hot. It does seem to affect the function of the AC system. It isn't getting cold in city traffic in hot weather. It does ok on the freeway. I tried jumping the temp switch. That didn't do anything. This fan was replaced just a few years ago. The fan shouldn't be bad. Any other ideas?

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  #2  
Old 06-06-2018, 01:01 PM
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Fuse? Relay? Pull the plug to the fan and check for voltage?
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  #3  
Old 06-17-2018, 11:37 AM
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Check the link in my signature. You need the fan relay. It powers the fan from a separate fuse whenever the compressor clutch is engaged.
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  #4  
Old 06-17-2018, 07:00 PM
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I thought the aux fan was triggered by a refrigerant temp switch on the dryer.

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98 E320s sedan and wagon
02 C320 wagon
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  #5  
Old 06-17-2018, 07:14 PM
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I think it is sixto. To the OP get ahold of Rollguy. He has a kit you can install that will make the electric fan run anytime the compressor is engaged.
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  #6  
Old 06-17-2018, 11:28 PM
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Quote:
Originally Posted by sixto View Post
I thought the aux fan was triggered by a refrigerant temp switch on the dryer.
It is. But the OP states that he jumpered the temp switch and the fan still did not operate.
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  #7  
Old 06-17-2018, 11:30 PM
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Quote:
Originally Posted by gregp1962 View Post
This fan was replaced just a few years ago. The fan shouldn't be bad. Any other ideas?
Here is an idea: power the fan directly and find out for sure if it works or not.
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  #8  
Old 06-18-2018, 01:02 AM
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smoke gets in your eyes
 
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Quote:
Originally Posted by engatwork View Post
I think it is sixto. To the OP get ahold of Rollguy. He has a kit you can install that will make the electric fan run anytime the compressor is engaged.
I misread ROLLGUY’s post.

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98 E320s sedan and wagon
02 C320

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