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#1
06-26-2009, 12:47 PM
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Round 4 Pins Coolant Temperature Switch ? which way should I plug in?
Help me out Guys!
My 91 300se coolant temperature switch look old enough to replace , so after I installed a new one now I try to plug it back and don't know which direction it should be plug in  you know the round 4 pin one near the fire wall..please help..many thanks.
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#2
06-26-2009, 12:49 PM
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The two thermistors in that sensor are diagonally wired and of the same value, so you can plug it in any way and it will always be correct.
__________________
A Dalton
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#3
06-26-2009, 12:55 PM
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#4
06-26-2009, 02:11 PM
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I could swear it only plugs in one way....
__________________
-diesel is not just a fuel, its a way of life-  '15 GLK250 Bluetec 118k - mine - (OC-123,800) '17 Metris(VITO!) - 37k - wifes (OC-41k) '09 Sprinter 3500 Winnebago View - 62k (OC - 67k) '13 ML350 Bluetec - 95k - dad's (OC-98k) '01 SL500 - 103k(km) - dad's (OC-110,000km) '16 E400 4matic Sedan - 148k - Brothers (OC-155k)
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#5
06-26-2009, 03:09 PM
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Quote:
From my manual: 4-pin engine coolant temperature sensor (Bl l/2) The engine coolant temperature sensor is a 4- pin design. It integrates two separate temperature sensors (NTC), which do not have any electrical connection to the housing of the engine coolant temperature sensor. One temperature sensor is used for the distributor ignition system and one for the CFI injection system. The connector of the engine coolant temperature sensor is designed so that it can be plugged-in in any position.
__________________
 1993 190E 2.3 2001 SLK230 1971 LS5 (454) Corvette Convertible
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#6
06-26-2009, 03:19 PM
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Quote:
__________________
A Dalton
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#7
06-26-2009, 03:20 PM
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Quote:
__________________
A Dalton
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#8
06-26-2009, 04:34 PM
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Quote:
  
__________________
-diesel is not just a fuel, its a way of life- '15 GLK250 Bluetec 118k - mine - (OC-123,800) '17 Metris(VITO!) - 37k - wifes (OC-41k) '09 Sprinter 3500 Winnebago View - 62k (OC - 67k) '13 ML350 Bluetec - 95k - dad's (OC-98k) '01 SL500 - 103k(km) - dad's (OC-110,000km) '16 E400 4matic Sedan - 148k - Brothers (OC-155k)
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#9
06-27-2009, 07:59 AM
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Don't over-tighten the sensor when you install it.
See top item in image below.  $ 50.00 down the drain plus another $ 50.00 to replace it. Plus it wasn't simple getting the broken half out.  
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#10
06-27-2009, 10:37 AM
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Quote:
__________________
-diesel is not just a fuel, its a way of life- '15 GLK250 Bluetec 118k - mine - (OC-123,800) '17 Metris(VITO!) - 37k - wifes (OC-41k) '09 Sprinter 3500 Winnebago View - 62k (OC - 67k) '13 ML350 Bluetec - 95k - dad's (OC-98k) '01 SL500 - 103k(km) - dad's (OC-110,000km) '16 E400 4matic Sedan - 148k - Brothers (OC-155k)
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