[urq] RE : Injector cooling fan testing WAS (stupid question of theday)

[Jim Haseltine]

Quick point to those that don't know the MB engine - it doesn't have a 
thermotime switch. The injector cooling switch is in the same place as the 
WR/WX - on the wastegate shield.

It is rare for the injector fan to run in northern Europe - I've only heard 
mine run a few times in the 8 years I've owned my MB, each time it was on an 
unusually hot summers day and I know that the switch trips at the specified 
temperature.

Regards,

Jim Haseltine

----- Original Message ----- 
From: "Louis-Alain Richard" <laraa at sympatico.ca>
To: "'Pasqualoni, James E'" <james.pasqualoni at gs.com>; "'Johan H'" 
<milisen at hotmail.com>
Cc: <urq at audifans.com>
Sent: Wednesday, March 22, 2006 2:44 PM
Subject: [urq] RE : Injector cooling fan testing WAS (stupid question of 
theday)


> Jim and Johan,
>
> The switch/sender for the injector cooling fan is NOT the thermo-time
> switch. The TTS is located on the back of the head, in a water passage
> and its role is to make the 6th injector (cold start valve) work only
> when the engine is cold.
>
> The switch/sender for the injector cooling is indeed located on the
> wastegate heat shield. And you are correct in stating that one just has
> to ground its single wire to test the complete circuit.
>
> If you want to test the switch, then just place it over the steam
> produced by a kitchen steamer; it should close at 85C (on an MB car).
> WX/WR/GV cars have a 100C switch.
>
> For the record:
> 034 919 369B = 85C
> 035 919 481B = 100C
>
> HTH,
>
> Louis-Alain
>
>
>> Johan,
>>
>> Ground the power wire to the thermo time switch (sending unit) located
>> on the wg heat shield.  If the injector fan comes on, then your thermo
>> time-switch is shot.  If the fan does not come on, then either the
>> relay or the fan is shot.  BTDT just last fall.
>>
>> HTH,
>> Jim
>
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