Thread: w124 87 300d
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Old 05-23-2019, 07:45 PM
Maxbumpo Maxbumpo is offline
Diesel Preferred
 
Join Date: Oct 2007
Location: Charleston SC
Posts: 2,789
Quote:
Originally Posted by Phillytwotank View Post
Switch would be failed open. Pulling those two wires makes the fan come on.

On my '87 wagon, I have to short across the temperature sensor I described in order to make the aux fan run. The switch would have to fail closed.



Looks like on later cars, your method should work. Any break in the circuit between the sensor and the PBU would cause the aux fan to run.
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M. Dillon
'87 124.193 (300TD) "White Whale", ~392k miles, 3.5l IP fitted
'95 124.131 (E300) "Sapphire", 380k miles
'73 Balboa 20 "Sanctification"
Charleston SC
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